摘要：
Garnet solid state electrolytes (SSEs) have emerged as propitious candidates for solid-state batteries (SSBs) with exceptional ionic conductivity and excellent (electro)chemical stability. However, the Li|garnet interface contact deterioration still remains a major challenge resulting in Li dendrite propagation. Herein, a method is proposed to strengthen the adhesion of garnet SSE and Li by incorporating Sr3N2 into the Li metal. Density functional theory (DFT) calculations reveal that the interfacial formation energy of Li|garnet is decreased by the obtained Li-Sr-N (LSN) composite, which can enable a shift from poor contact to intimate bonding at the Li|garnet interface and a homogenous Li+ flux as well as electric field distribution. Simultaneously, the produced Li3N and LiSrN, which are known for their strong Li adsorption affinity and rapid Li+ transfer kinetics, actively govern the Li plating process. Thereby this rational design brings a notable reduction in interfacial impedance (4.5 omega cm2), along with the increased critical current density (1.3 mA cm-2) and enhanced cycle stability (1200 h at 0.3 mA cm-2). Furthermore, The LFP|garnet|LSN full cell has demonstrated remarkable cycling performance (95.9% capacity retention after 200 cycles at 1 C) and favorable rate capability (150.2 mAh g-1 at 0.1 C and 134.9 mAh g-1 at 1 C). The research provides a new sight into lithium modification that can restrain Li|garnet interface deterioration and lay the groundwork for future advancements in high-performance garnet- based SSBs. A simple tactic for fabricating a Li-Sr-N (LSN) composite anode tailored for solid-state batteries is proposed via the reaction between Li and Sr3N2. The interfacial contact with Li6.5La3Zr1.5Ta0.5O12 (LLZTO) pellet is greatly enhanced via LSN composite, enabling a homogeneous Li+ flux and electric field distribution during the Li plating/stripping process.image
摘要：
As one of the most productive ecosystems in the world, mangrove has a critical role to play in both the natural ecosystem and the human economic and social society. However, two thirds of the world's mangrove have been irreversibly damaged over the past 100years, as a result of ongoing human activities and climate change. In this paper, adopting Landsat for the past 36years as the data source, the detection of spatiotemporal changes of mangrove in southern China was carried out based on the Google Earth Engine (GEE) cloud platform using the LandTrendr algorithm. In addition, the attribution of mangrove disturbances was analyzed by a random forest algorithm. The results indicated the area of mangrove recovery (5174.64 hm(2)) was much larger than the area of mangrove disturbances (1625.40 hm(2)) over the 35-year period in the study area. The disturbances of mangrove in southern China were dominated by low and low-to-medium-level disturbances, with an area of 1009.89 hm(2), accounting for 57.50% of the total disturbances. The mangrove recovery was also dominated by low and low-to-medium-level recovery, with an area of 3239.19 hm(2), accounting for 62.61% of the total recovery area. Both human and natural factors interacted and influenced each other, together causing spatiotemporal disturbances of mangrove in southern China during 1986-2020. The mangrove disturbances in the Phase I (1986-2000) and Phase III (2011-2020) were characterized by human-induced (50.74% and 58.86%), such as construction of roads and aquaculture ponds. The mangrove disturbances in the Phase II (2001-2010) were dominated by natural factors (55.73%), such as tides, flooding, and species invasions. It was also observed that the area of mangrove recovery in southern China increased dramatically from 1986 to 2020 due to the promulgation and implementation of the Chinese government's policy on mangrove protection, as well as increased human awareness of mangrove wetland protection.
摘要：
Stabilizing zinc anode is a systematic project for aqueous zinc ion batteries (ZIBs), which needs to solve many problems such as dendrite growth, corrosion, hydrogen evolution, and other side reactions. It is urgent to develop a protective layer for zinc anode to solve these problems at one time. Based on the results of calculation, a hydrophobic multifunctional fluorinated carbon dots (F-CDs) protective layer with three kinds of zincophilic groups (-CO, -CHO and -F) was constructed on the Zn anode surface. As expected, these zincophilic groups on the F-CDs layer functioned as zincophilic sites to achieve uniform Zn deposition. Especially, the -F group could in-situ promote the formation of ZnF2 under the F-CDs layer and the ZnF2 layer is usually considered as a solid Zn2+ conductor layer to further even Zn deposition. Additionally, the experimental results also demonstrated that the F-CDs layer coupled with in-situ generated ZnF2 interlayer can not only tackle above issues in an integrated way, but also induce the deposition of Zn on the preferred (002) plane. Therefore, the Zn@F-CDs anode exhibits an ultra-long cycling life over 3500 h at 1 mA cm–2, together with an excellent average coulombic efficiency (99.32% for over 1100 h) in half cells.
摘要：
The loading intermittence duo to the time interval between adjacent passing trains is conducive to improving the dynamic stability of railway subgrade, but this intermittence effect is always ignored in existing experimental studies on the dynamic characteristics of subgrade fillers in which a continuous cyclic loading method was adopted to simulate the long-term train-induced loading on subgrade. This paper aims to study the backbone curves of subgrade silty filler under intermittent train-induced loading, considering the time interval between adjacent passing trains. By conducting a series of intermittent cyclic triaxial tests on silty filler, the backbone curves of each loading stage were constructed, and the effects of loading intermittence on the backbone curves were elaborated. The experiment results indicate that the loading intermittence enhances the resistance of subgrade silty filler to the dynamic loading and is conducive to the upward deviation of the backbone curves. The loading intermittence could effectively increase the ultimate value of dynamic stress amplitude that the silty filler could bear under cyclic loading, but has little effect on the maximum/initial resilient modulus. The backbone curves increase approximately linear under the states of plastic shakedown and plastic creep, but show significant nonlinearity after including the incremental collapse samples. Hyperbolic models for backbone curves such as H-D model and its improvement model could be adopted to characterize the backbone curves of silty filler under intermittent loading, and the normalization of H-D model was also discussed to integrate the influencing factors (i.e., moisture content and confining pressure) of the backbone curves.
作者：
Yan, Weiliang;Li, Cong;Liu, Zhiyuan;Cheng, Chunyu;Yang, Li
期刊：
Coatings,2024年14(1):136- ISSN：2079-6412
通讯作者：
Yang, L
作者机构：
[Cheng, Chunyu; Yang, L; Liu, Zhiyuan; Yan, Weiliang; Yang, Li; Li, Cong] Xidian Univ, Sch Adv Mat & Nanotechnol, Xian 710126, Peoples R China.;[Cheng, Chunyu; Yang, L; Liu, Zhiyuan; Yan, Weiliang; Yang, Li; Li, Cong] Xidian Univ, Shaanxi Key Lab High Orbits Electron Mat & Protect, Xian 710126, Peoples R China.;[Liu, Zhiyuan] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Key Lab Interface Sci Mat Surface & Tec, Changsha 410004, Peoples R China.
通讯机构：
[Yang, L ] X;Xidian Univ, Sch Adv Mat & Nanotechnol, Xian 710126, Peoples R China.;Xidian Univ, Shaanxi Key Lab High Orbits Electron Mat & Protect, Xian 710126, Peoples R China.
关键词：
reliability;numerical simulation;thermal barrier coatings;gas thermal shock;high-speed rotation;Monte Carlo
摘要：
The uncertain service life of thermal barrier coatings (TBCs) imposes constraints on their secure application. In addressing this uncertainty, this study employs the Monte Carlo simulation method for reliability evaluation, quantifying the risk of TBC peeling. For reliability evaluation, the failure mode needs to be studied to determine failure criteria. The failure mode of high-speed rotating TBCs under gas thermal shock was studied by combining fluid dynamics simulations and experiments. Based on the main failure mode, the corresponding failure criterion was established using the energy release rate, and its limit state equation was derived. After considering the dispersion of parameters, the reliability of TBCs was quantitatively evaluated using failure probability and sensitivity analysis methods. The results show that the main mode is the fracture of the ceramic layer itself, exhibiting a distinctive top-down "step-like" thinning and peeling morphology. The centrifugal force emerges as the main driving force for this failure mode. The failure probability value on the top side of the blade is higher, signifying that coating failure is more likely at this location, aligning with the experimental findings. The key parameters influencing the reliability of TBCs are rotation speed, temperature, and the thermal expansion coefficient. This study offers a valuable strategy for the secure and reliable application of TBCs on aeroengine turbine blades.
摘要：
This article presents a new theoretical method for the torsional-flexural vibration response of a thin-walled beam with closed cross sections under a uniformly distributed moving load. Based on Vlasov's theory and restrained torsion theory, a comprehensive equation of motion for torsional flexural vibration is established by considering the effects of additional torque caused by the change of the shear center and the center of mass and the warpage coefficient. Using the Fourier transform, Laplace transform, and their inverse transformations, the torsional-flexural vibration response expression of thin-walled beams with closed cross-sections under a uniformly distributed moving load was derived. The results calculated by the analytical solutions in this study were compared with those from finite element method, demonstrating the reliability and superiority of the analytical solutions. Compared with the method that ignores the warpage coefficient, the lateral displacement and torsion angle of the beam calculated by the proposed theoretical method decreased by more than 12.00%. The effect of the cross-sectional properties on the natural frequency of the torsional-flexural vibration of thin-walled beams is analyzed, and the results show that the moment of inertia and mass per unit length have a considerable influence on the torsional-flexural frequency, which increases with the moment of inertia and decreases with an increase in the mass per unit length. The influences of the load magnitude, load velocity, and load eccentricity on the dynamic response were further investigated. According to the results, the lateral displacement of the beam increased significantly with increases in the load eccentricity and load magnitude. In practical engineering, the conclusions of this study can be used to limit the torsional-flexural vibration response of simple maglev support bridges to ensure the safety of vehicles and passengers.
摘要：
Metal(loid) contamination of agricultural soils has become an alarming issue due to its detrimental impacts on soil health and global agricultural production. Therefore, environmentally sustainable and cost-effective solutions are urgently required for soil remediation. Biochar, particularly nano-biochar, exhibits superior and high-performance capabilities in the remediation of metal(loid)-contaminated soil, owing to its unique structure and large surface area. Current researches on nano-biochar mainly focus on safety design and property improvement, with limited information available regarding the impact of nano-biochar on soil ecosystems and crop defense mechanisms in metal(loid)-contaminated soils. In this review, we systematically summarized recent progress in the application of nano-biochar for remediation of metal(loid)-contaminated soil, with a focus on possible factors influencing metal(loid) uptake and translocation in soil-crop systems. Additionally, we conducted the potential/related mechanisms by which nano-biochar can mitigate the toxic impacts of metal(loid) on crop production and security. Furthermore, the application of nano-biochar in field trials and existing challenges were also outlined. Future studies should integrate agricultural sustainability and ecosystem health targets into biochar design/selection. This review highlighted the potential of nano-biochar as a promising soil amendment for enhancing the remediation of metal(loid)-contaminated agricultural soils, thereby promoting the synthesis and development of highly efficient nano-biochar towards achieving environmental sustainability.
摘要：
ETHNOPHARMACOLOGICAL RELEVANCE: Huzhang-Guizhi herb pair (HGHP), composed of Polygonum cuspidatum (Huzhang [HZ] in Chinese, the root of Polygonum cuspidatum Sieb. & Zucc.) and Ramulus Cinnamomi (Guizhi [GZ] in Chinese, the dried twig of Cinnamomum cassia Presl.), is a popular herb pair commonly used to treat arthritis and involved in many Chinese prescriptions. In order to reveal the influence of GZ on HZ on bioavailability, the pharmacokinetic behaviors and tissue distribution variations of the three analytes from HZ were detected between oral administration of HZ and HGHP extracts to rats. MATERIALS AND METHODS: Male Sprague-Dawley rats were randomly assigned to two groups for pharmacokinetics study and eight groups for tissues distribution research with the equivalent dose of 18g crude HZ/kg. Assays for analytes from HZ (polydatin, resveratrol, emodin) were developed and validated using high performance liquid chromatography with ultraviolet detection (HPLC-UV). RESULTS: Part pharmacokinetic parameters including area under the concentration-time curve (AUC), the maximum plasma concentration (C(max)), biological half-life (t(1/2)), mean residence time (MRT), time to peak concentration (T(max)), clearance rate/bioavailability (CL/F) and volume of distribution/bioavailability (Vd/F) showed significant difference (P<0.05) after oral administration of HGHP, as compared to those of HZ. The three analytes could be detected in heart, liver, spleen, lung, kidney and brain. Compared with the HZ group, AUC(0-t) of polydatin in heart, liver and kidney increased significantly (p<0.05) while that in spleen decreased significantly (p<0.05); AUC(0-t) of resveratrol in all detected tissues increased conspicuously (p<0.05) in the HGHP group; AUC(0-t) of emodin in heart, liver, spleen, lung, and kidney increased conspicuously (p<0.05), and decreased obviously (p<0.05) in brain in the HGHP group. CONCLUSIONS: GZ could strongly influence the pharmacokinetic parameters and tissue distribution characteristics of polydatin, resveratrol and emodin in rats when administrated with HZ or HGHP extracts. It might provide a reference for further explanation of the compatibility mechanism and the clinical application of HGHP.
期刊：
International Journal of Biological Macromolecules,2024年258(Pt 2):128975 ISSN：0141-8130
通讯作者：
Yang, Xi;Li, XJ
作者机构：
[Fan, Shutong; Yang, Xi; Li, Xianjun; Yang, X; Li, XJ] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Gao, Xun] Wenzhou Univ Technol, Coll Architecture & Energy Engn, Wenzhou 325006, Peoples R China.
通讯机构：
[Yang, X; Li, XJ ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Chinese fir;Flame retardant;Phytic acid;Thermal stability;Zinc phytate
摘要：
To be suitable for certain construction and furniture applications, wood must be treated with a flame retardant and impregnating flame retardants into the cellulose lumens of wood is an effective flame retardant method. Phytic acid, the main storage form of phosphorus in various plant tissues, is an inexpensive, and non-toxic biomaterial that shows potential applications as an environmentally friendly bio-based flame retardant. In this study, phytic acid and zinc phytate were used to impregnate delignified wood under vacuum and pressure, which greatly enhanced the flame retardancy and smoke suppression properties of Chinese fir, while still maintaining its original texture. Phytic acid and zinc phytate were hydrogen-bonded to cellulose in wood. Phytic acid and zinc phytate were hydrogen-bonded to cellulose in wood. The results showed that the total heat release (THR) of Chinese fir treated with zinc phytate decreased from 55.66MJ/m(2) to 5.90MJ/m(2), and a compact carbonized protective layer was quickly formed on the surface of Chinese fir after ignition. Thermogravimetric analysis (TGA) showed that the char yield of Chinese fir treated by the flame retardant was 177.6% higher than that of untreated wood. This study provides an efficient, sustainable, and economical method to prepare Chinese fir with excellent flame retardancy and thermal insulation performance.
摘要：
Amidst the progressive depletion of non-renewable resources on a global scale, the expedited development of green and sustainable materials has become an imperative. Cellulose, a recognized environmentally friendly substance, presents itself as a solution owing to its low cost, abundant availability, facile degradability, and renewability. Its potential to gradually supplant petroleum resources, thereby yielding a diverse array of high value-added materials, is well acknowledged. Herein, we present an exploration of the utilization of cellulose as a precursor, rooted in its fundamental properties. Moreover, we undertake a comprehensive review of the preparation techniques and structural property characteristics exhibited by mainstream cellulose-based functional materials. These materials notably include cellulose spheres, cellulose hydrogels, cellulose aerogels, cellulose films, and cellulose-derived carbon materials. Following this extensive review, our article accentuates the strides made in the field of cellulose-based functional materials across diverse pertinent domains. These encompass materials essential for adsorption and separation purposes, biomedical devices, electrode capacitive applications, and the emerging landscape of smart electronic devices. Concluding our discourse, we address the challenges that lie ahead and outline the potential future prospects for the development of cellulose-based functional materials.
摘要：
Maire yew (Taxus mairei), an evergreen conifer, has high ornamental and medicinal value. The arils of this species has three different colors. However, the variation mechanisms of arils color formation remains unclear. Here, the gene expression and metabolite concentration were profiled for red (RTM), yellow (YTM), and purple (PTM) arils in different developmental stages. A total of 266 flavonoids and 35 carotenoids were identified. The predominant pigments identified in YTM were epiafzelechin, lutein, and β-Cryptoxanthin, while malvidin-3,5-di-O-glucoside and apigenin played crucial roles in PTM. And significant differential expression was observed among the HCT, DFR, LAR, ANS, crtB, NCED, and CCoAOMT genes across different color arils. During the maturation of yellow arils, the upregulation of HCT was strongly correlated with the accumulation of epiafzelechin. The diminished expression of DFR, LAR, and ANS seemed to inhibit the production of delphinidin-3-O-rutinoside. The decrease in crtB expression and concurrent increase in NCED expression potentially regulate the heightened accumulation of lutein. Meanwhile, the accumulation of β-cryptoxanthin appeared seemed to be positively influenced by NCED. As aril turning purple, the decreased expression of CCoAOMT seemed to facilitate the synthesis of apigenin. The substantial upregulation of DFR promoted the production of malvidin-3,5-di-O-glucoside. Additionally, the overexpression of MYBs may plays the important role in regulating the formation of different colored arils. In total, 14 genes were selected for qRT-PCR validation, the results indicated the reliability of the transcriptome sequences data. Our findings could provide valuable insight into the molecular breeding, development, and application of Maire yew resources.
作者机构：
[Wu, Yiping; Yin, Xiaowei; Zhang, Guangchuang; Li, Huiwen; Jin, Zhangdong; Zhao, Fubo; Wu, YP; Qiu, Linjing] Xi An Jiao Tong Univ, Inst Global Environm Change, Sch Human Settlements & Civil Engn, Dept Earth & Environm Sci, Xian 710049, Shaanxi, Peoples R China.;[Wu, Yiping; Wu, YP] Natl Observat & Res Stn Reg Ecol Environm Change &, Xian 710061, Peoples R China.;[Wu, Yiping; Wu, YP; Qiu, Linjing] Shaanxi Land Engn Construct Grp Co Ltd, Technol Innovat Ctr Land Engn & Human Settlements, Xian 710115, Shaanxi, Peoples R China.;[Wu, Yiping; Wu, YP; Qiu, Linjing] Xi An Jiao Tong Univ, Xian 710115, Shaanxi, Peoples R China.;[Li, Huiwen] Northwestern Polytech Univ, Sch Ecol & Environm, Xian 710072, Shaanxi, Peoples R China.
通讯机构：
[Wu, YP ] X;[Liu, SG ] C;Xi An Jiao Tong Univ, Inst Global Environm Change, Sch Human Settlements & Civil Engn, Dept Earth & Environm Sci, Xian 710049, Shaanxi, Peoples R China.;Natl Observat & Res Stn Reg Ecol Environm Change &, Xian 710061, Peoples R China.;Shaanxi Land Engn Construct Grp Co Ltd, Technol Innovat Ctr Land Engn & Human Settlements, Xian 710115, Shaanxi, Peoples R China.
关键词：
Water conservation;SWAT;Watershed ecosystem;Hydrological process
摘要：
The water conservation (WC) function is an important indicator for ecosystem health. However, the commonlyused technical term like water retention (WR) and its computation methods could not well reflect the concept of WC because WR focused on the amount of water retained in vegetation canopy and soil, whereas WC includes WR and water supply as well. This study is to propose a new index for assessing the WC function (WCI) by integrating ecological and hydrological factors including WR, water yield, and vegetation production. We further developed a new framework for calculating spatiotemporal dynamics of WCI using ecohydrological modeling of Soil and Water Assessment Tool (SWAT) and remote sensing data. We then used the framework to assess the spatiotemporal dynamics of WC function in the Weihe River Basin (WHRB), the largest tributary of the Yellow River. Compared to the traditional method, our newly-developed approach is more reasonable because it could reflect water retention amount, temporal stability of water yield, and vegetation quality. Further, the case study can tell it is our new index (with forest being the highest, followed by grassland and cropland), instead of WR (with grassland being the highest and forest being the least), that could reflect the definition of WC and meet our cognition. Spatially, the high WCI (0.4 0.6) areas are mainly located in the southern and central-eastern parts of the WHRB, characterized by relatively higher forest coverage (e.g., the Qinling Mountains in the southern part of the study area in southern part and representative 'Grain-For-Green' in central-eastern part). In brief, this study enhances understanding of the WC function and also provides a method for assessing the dynamics of WC that can be applicable to other regions.
摘要：
Climate changes have dramatically affected forest succession. However, how trees at different successional stages respond to climate warming is unclear in the subtropics. Here, we compared the radial growth (RW) and xylem features of the early-successional stage Castanea mollissima and late-successional stage Quercus fabri in subtropical forests and assessed their response to climate changes. All parameters, including RW, number of vessels (VN), vessel density (VD), mean (MVA) and total (TVA) vessel area, percentage of conductive area within xylem (RCTA), theoretical (Kh) and xylem-specific (Ks) hydraulic conductivity, except for MVA of C. mollissima were significantly higher than those of Q. fabri. During the drought period, a notable adverse correlation between two cluster parameters of Q. fabri, associated with hydraulic safety and efficiency, suggested a pronounced hydraulic trade-off in Q. fabri under drought conditions. Castanea mollissima was more sensitive to climate and more prone to hydraulic failure than Q. fabri. Temperatures and moisture conditions positively and negatively affected the hydraulic efficiency-related parameters of C. mollissima. Moisture conditions in the previous summer and winter were significantly negatively and positively related to the radial growth of both species. The impact of generalized warming was not evident due to variations in hydraulic strategies and species characteristics, trade-offs between non-growing and growing season climates, and specific competition. If climate warming continues, C. mollissima growth will probably significantly decline due to the increasing risk of hydraulic failure. Warming may accelerate species replacement and forest succession in the study area by changing their lifespans and competitive relationships.
摘要：
Microorganisms regulate soil organic matter (SOM) formation through accumulation and decomposition of microbial necromass, which is directly and indirectly affected by elevated CO2 and N fertilization. We investigated the role of microorganisms in SOM formation by analyzing C-13 recovery in microorganisms and carbon pools in paddy soil under two CO2 levels, with and without N fertilization, after continuous (CO2)-C-13 labelling was stopped. Microbial turnover transferred C-13 from living microbial biomass (determined by the decrease in phospholipid fatty acids) to necromass (determined by the increase in amino sugars). C-13 incorporation in fungal living biomass and necromass was higher than that in bacteria. Bacterial turnover was faster than necromass decomposition, resulting in net necromass accumulation over time; fungal necromass remained stable. Elevated CO2 and N fertilization increased the net accumulation of bacterial, but not fungal, necromass. CO2 levels, but not N fertilization, significantly affected C-13 incorporation in SOM pools. Elevated CO2 increased C-13 in particulate organic matter via the roots, and in the mineral-associated organic matter (MAOM) via bacterial, but not fungal, necromass. Overall, bacterial necromass plays a dominant role in the MAOM formation response to elevated CO2 because bacteria are sensitive to elevated CO2.
摘要：
In this study, without introducing any chemical cross-linking agent, a high-strength and stretchable gelatin-based conductive hydrogel was prepared by simple and efficient physical blending using the unique triple-helical cross-linking structure of gel and the hydrogel physical cross-linking network formed by the hydrogen bonding between MFC and gel molecules. Fourier-transform infrared (FT-IR) was carried out to investigate interactions between MFC and gel, demonstrating that the hydrogel dimensional stability is mainly due to a mass of hydrogen bonds, which is formed by the polar groups (-OH) in MFC molecules and the polar groups (-OH, -NH2, and -C & boxH;O) in Gel molecules. The MFC, interestingly, can help to improve the dispersion of GR inside the hydrogel, which facilitates the formation of electron-conducting channels and facilitates electron transport, thereby increasing the electrical conductivity of the material; when the content of MFC is 6%, the conductivity of the hydrogel reaches the maximum value of 7.25 x 10(-3) S/m. The strain sensor developed based on the GR/MFC/Gel hydrogel has excellent sensitivity (GF = 2.77), outstanding response ability (response time is 0.2 s, and recovery time is 0.3 s), and excellent cycle stability and can be used as a smart wearable material for real-time monitoring of human motions such as finger, elbow, and wrist bending, as well as tiny facial expressions such as smiling, opening mouth, frowning, and blinking. In addition, it can be used as an electronic pen to recognize complex handwriting and convert mechanical signals of the human body into real-time electrical signals.
摘要：
Bimetallic phosphides exhibit superior electrocatalytic activities and synergistic effects that make them ideal electrocatalysts for the urea oxidation reaction (UOR). Herein, P, N-codoped carbon-encapsulated cobalt/nickel phosphides derived from NiCo-MOF-74 (NiCoP@PNC) and anchored on P-doped carbonized wood fiber (PCWF) for UOR were prepared through synchronous carbonization and phosphorization. By benefiting from the synergistic effect of structural and electronic modulation, NiCoP@PNC/PCWF exhibits excellent UOR electrocatalytic performance under alkaline conditions, achieving a current density of 50mAcm(-2) with a potential of only 1.34V (vs reversible hydrogen electrode, RHE) and continuous operation for more than 72h. In addition, for the overall urea splitting, an electrolyzer using UOR replaced OER, which required only 1.50V to achieve a current density of 50mAcm(-2) with excellent stability, 230mV less than that required for the HER||OER system. In-depth theoretical analysis further proves that the strong synergistic effect between Co and Ni optimizes electronic structures, yielding excellent UOR properties. The synergistic strategy of structural and electrical modulation provides broad prospects for the design and synthesis of excellent UOR electrocatalysts for energy-saving hydrogen production by using renewable resources.
期刊：
Science of The Total Environment,2024年908:168319 ISSN：0048-9697
通讯作者：
Wan, DJ;Gu, JF
作者机构：
[Wan, Da-juan] Hunan Normal Univ, Sch Geog Sci, Changsha 410081, Hunan, Peoples R China.;[Yang, Wen-jun; Liao, Bo-han; Zeng, Peng; Gu, Jiao-feng] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Hunan Engn Lab Control Rice Qual & Safety, Changsha 410004, Peoples R China.;[Yang, Wen-jun; Liao, Bo-han; Zeng, Peng; Gu, Jiao-feng; Zhou, Hang] Hunan Prov Key Lab Wetland & Soil Ecol Remediat, Changsha 410004, Peoples R China.
通讯机构：
[Wan, DJ ] H;[Gu, JF ] C;Hunan Normal Univ, Sch Geog Sci, Changsha 410081, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Hunan Engn Lab Control Rice Qual & Safety, Changsha 410004, Peoples R China.
关键词：
Auxiliary measures;Heavy metal contamination;Phytoremediation;Rotation mode
摘要：
Phytoremediation is the direct use of living green plants and it is an effective, inexpensive, non-invasive, and environmentally friendly technique used to transfer or stabilize all the toxic metals and environmental pollutants in polluted soil or ground water. To study the effect of tartaric acid, gibberellin, and tartaric acid coupled with gibberellin on rape-kenaf or rape-sweet sorghum rotation, a field experiment was carried out on a farmland combined polluted with Cd and Pb in eastern Hunan Province, China. The results showed that these two rotation systems coupled with superposition measure has potential to enhance yield and biomass of rape (Brassica napus L.), kenaf (Hibiscus cannabinus) and sweet sorghum (Sorghum dochna (F.) Snowden), as well as to increase Cd and Pb uptake of the three crops, thus accelerating phytoextraction. The Cd and Pb annual removal by rape-kenaf rotation in one year under different treatments were 269-438 and 112-149 g & sdot;hm- 2, respectively. And the Cd and Pb annual removal by rape-sweet sorghum rotation in one year under different treatments were 68.0-111 and 43.8-92.3 g & sdot;hm- 2, respectively. Under the two rotation systems, these integrated management measures can remove Cd and Pb up to 438 g & sdot;hm- 2 & sdot;year- 1 and 149 g & sdot;hm- 2 & sdot;year- 1, respectively. The Cd and Pb content in rape seeds or sweet sorghum stems and leaves were lower than the food or forage standard, indicating that we can use this rotation system for both remediation and safety production. Furthermore, the two rotation systems also generated considerable economic value. These results showed that the combination of phytoremediation and agricultural production is a feasible technical mode in the field of Cd and Pb co-contamination, and also provides useful information for further study of the interaction mechanism between rotation crops and enhancement measures. In subsequent experiments we can set concentration gradients for tartaric acid and gibberellin, and we can also select other crops for rotation, with a view to finding the optimal auxiliary measure and crop rotation modern.
摘要：
In this study, the manganese oxide/biochar composites (Mn@BC) were synthesized from Phytolacca acinosa Roxb. The Mn@BC was analyzed via techniques of Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction analysis (XRD). The results show that MnO(x) is successfully loaded on the surface of BC, and the load of MnO(x) can increase the number of surface functional groups of BC. X-ray photoelectron spectroscopy (XPS) shows that MnO(x) loaded on BC mainly exists in three valence forms: Mn(Ⅱ), Mn(Ⅲ), and Mn(Ⅳ). The ability of Mn@BC to activate periodate (PI) was studied by simulating the degradation of methylene blue (MB) dye. The degradation experiment results showed that the MB removal rate by the Mn@BC/PI system reached 97.4% within 30min. The quenching experiment and electron paramagnetic resonance (EPR) analysis confirmed that Mn@BC can activate PI to produce iodate (IO(3)•), singlet oxygen ((1)O(2)), and hydroxyl radical (•OH), which can degrade MB during the reaction. Response surface methodology (RSM) based on Box-Behnken Design (BBD) was used to determine the interaction between pH, Mn@BC and PI concentration in the Mn@BC/PI system, and the optimum technological parameters were determined. When pH=5.4, Mn@BC concentration 0.56mg/L, PI concentration 1.1mmol/L, MB removal rate can reach 98.05%. The cyclic experiments show that Mn@BC can be reused. After four consecutive runs, the removal rate of MB by the Mn@BC/PI system is still 82%, and the Mn@BC/PI system also shows high performance in treating MB in actual water bodies and degrading other pollutants. This study provides a practical method for degrading dyes in natural sewage.
关键词：
MXene/g-C 3 N 4 heterojunction;Photocatalysis;Degradation;Ciprofloxacin
摘要：
The extensive use of ciprofloxacin (CIP) poses a great threat to aquatic ecosystem, due to its potentially serious inhibitory effect on the microbial activity and low natural degradation rate. Photocatalytic degradation has emerged as a feasible method for treating CIP pollution. In this study, Ti3C2 reinforced g-C3N4 heterojunction material (MX/CN) was prepared using solvent drying method. The heterojunction composite accelerated the electron transfer rate, and the resulting MX/CN exhibited superior photocatalytic activity against CIP under visible light driving. The MX/CN sample achieved higher CIP photocatalytic removal rate of 97.8 %, 1.23 times higher than CN. Moreover, 6 %-MX/CN showed the best photocatalytic activity at pH = 7 when the initial concentration of CIP was 10 mg/L. Under neutral condition, the presence of Cl-, NO3 �, and HCO3 � reduced the degradation of CIP, where the addition of HCO3- caused a competed redox reaction with center dot OH in the system, resulting in a reduction of the CIP degradation efficiency to 30.9 %. The photocatalytic mechanism involving MX/CN was proposed according to the trapping experiments of active species, which confirmed that center dot O2 � was the primary active component in photocatalytic degradation of CIP and h+ and center dot OH also played significant roles. Finally, cycling experiments using MX/CN showed that the CIP degradation efficiency maintained more than 90 % after five cycles.
摘要：
Dredged sediment has a high-water content and complex contaminant composition, dramatically impacting the environment if not treated and managed correctly. However, at the same time, it is also a valuable phosphorusrich resource. Treating contaminated dredged sediments for resource recycling is critical to achieving sustainable development goals. In this study, a novelty neutral pH electro-Fenton (EF) experimental device was specifically designed for phosphorus (P) transformation study in dredged sediment. Result showed that the transformation of P forms in dredged sediments due to & sdot;OH generation in this EF system. The decrease rates of organic P (OP) and apatite P (Ca-P) were 21.8 % and 69.6 %, respectively, while, the increase rates inorganic P (IP) and non-apatite inorganic P (Fe-P) were 25.2 % and 250.0 %, respectively, after 6 h of EF reaction. Analysis of the microbial community revealed that the EF reaction did not significantly reduce microbial diversity in the dredged sediment (p > 0.05). Furthermore, the abundance of Massilia and Thiobacillus, which are involved in transforming P form, increased significantly following the EF reaction and was positively correlated with Fe-P and IP (R2 > 0.999) and negatively correlated with OP and Ca-P (R2 > 0.999). This study proves that treating polluted dredged sediment with a neutral pH EF system can transform P into bioavailable forms. This work provides a new and sustainable strategy for recycling P from phosphorus-rich waste streams as a substitute for mining P rock.
