摘要：
A novel layered perovskite tantalate phosphor Sr3LaTa3O12:Sm3+ (SLTO:Sm3+) with orange-red emission was obtained for the first time via the solid-phase synthetic method. The phase purity, surface morphology, element distribution and luminescent properties of the SLTO:xSm(3+) (x = 0.01 mol%-0.30 mol%) phosphors were investigated. Under 408 nm excitation, the optimum doped SLTO:0.10Sm(3+) phosphor emits orange-red light at 598 nm with the highest emission peak ((4)G(5/2) -> H-6(7/2)). The critical energy transfer distance is 1.687 nm. The prepared SLTO:0.10Sm(3+) phosphor has excellent thermal stability with temperature quenching temperature (T-0.5 > 500 K) and high activation energy (E-a = 0.25 eV). Through calculation, the chromaticity coordinates of all samples are concentrated in the orange-red area, and the color purity reaches 99%. The fabricated white light-emitting diode (w-LED) has a good correlated color temperature (5132 K), a high R-a (89), and the CIE chromaticity coordinates (0.340, 0.327). Consequently, the superiority of orange-red-emitting tantalate SLTO:Sm3+ phosphors for w-LEDs is demonstrated. (c) 2023 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
期刊：
Industrial Crops and Products,2024年210:118162 ISSN：0926-6690
通讯作者：
Guo, X;Wu, YQ
作者机构：
[Ma, Qiang; Zhang, Xuefeng; Guo, Xin; Qi, Xinmiao; Liu, Meng] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Chen, Yizheng] Hunan Inst Engn, Sch Chem & Chem Engn, Hunan Prov Key Lab Environm Catalysis & Waste Recy, Xiangtan 411104, Peoples R China.;[Wu, Yiqiang; Zuo, Yingfeng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Xie, Xiangjing] Hunan Inst Engn, Coll Text & Clothing, Xiangtan 411104, Peoples R China.
通讯机构：
[Wu, YQ ; Guo, X ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Wood;Carbon dots;Adsorption;Pb(II)
摘要：
For the high -value utilization of wood, a novel non-cytotoxic bifunctional wood (NBW) was synthesized in this study for simultaneous adsorption and detection of Pb(II). Adsorption experiments showcased the remarkable maximum adsorption capacity of NBW, measuring 211.6 mg/g. The adsorption isotherm followed the Langmuir model, and concurrently, adsorption kinetics adhered to the pseudo -second -order model. Critically, NBW exhibited exceptional reusability, maintaining 81.0% of its initial adsorption capacity even after undergoing six consecutive adsorption/desorption cycles. Additionally, it demonstrated notable temporal stability, preserving more than 84.2% of its initial adsorption capacity after a fifteen-week storage period. Furthermore, NBW was used for selective and sensitive detection of Pb(II), yielding a low limit of detection of 0.13 mu g/L. The fluorescence quenching of NBW resulted from both the internal filtering effect and dynamic quenching. Importantly, the cost analysis demonstrated that the expense of removing Pb(II) per gram using NBW was only CNY 0.50, significantly lower than the cost associated with activated carbon, totaling CNY 2.11. This study lays the groundwork for the development of a long -term stable, reusable, cost-effective, and multifunctional adsorbent.
期刊：
Process Safety and Environmental Protection,2024年182:405-415 ISSN：0957-5820
通讯作者：
Xu, T
作者机构：
[Tang, Xiting; Zeng, Zhen] Cent South Univ Forestry & Technol, Sch Life Sci & technol, Changsha 410004, Peoples R China.;[Xu, T; Zhou, Yihui; Xu, Tao] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Wu, Qingyu; Liu, Kang; Hu, Simeng] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Xu, Tao; Yu, Gang] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.;[Zhou, Yihui; He, Miao] Aerosp Kaitian Environm Technol Co Ltd, Changsha 410100, Peoples R China.
通讯机构：
[Xu, T ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
关键词：
Sinusoidal alternating current coagulation;Heavy metal ions;Process evaluation;Adsorption behavior;Removal mechanism
摘要：
A novel photovoltaic energy-sinusoidal alternating current coagulation (PE-SACC) system was proposed for the removal of heavy metal ions (HMs) in electroplating wastewater. A response surface methodology was used to study the combined effect of two factors on removal efficiency (Re) and energy consumption (EEC), and the optimal process parameters were obtained. The morphology, surface element content, crystal structure, and chemical composition of the flocs generated during the electrocoagulation (EC) process were characterized using SEM, EDS, XRD, FTIR, and XPS techniques. The intra-particle diffusion model was used to describe the adsorption behavior of HMs (Cu2+, Zn2+ and Ni2+) by flocs. Finally, the removal mechanism of HMs by SACC technology and its application in actual wastewater treatment were discussed in detail. The results revealed that when c(0)(Ni2+) = c(0)(Zn2+) = c(0)(Cu2+) = 50 mg.dm(-3), c (Cl ) over bar = 100 mg.dm(-3), pH(0) = 10, j = 1.3 A.m(-2), t = 85 min, the Re(Cu2+), Re(Zn2+) and Re(Ni2+) were 99.3%, 99.1%, and 98.4%, respectively, and the EEC was 0.105 kWh.m(-3). Compared with the traditional direct current coagulation (DCC), EEC, electrode consumption, and sludge production in SACC mode were reduced by 37.1%, 62.2%, and 66.6%, respectively. The PE-SACC system achieved ultra-low cost treatment of heavy metal electroplating wastewater. The adsorption process included surface adsorption, pore adsorption, and adsorption equilibrium. The mechanisms for the removal of HMs included cathode reduction, alkaline precipitation, and adsorption. In the actual wastewater treatment process, the removal efficiency of HMs could still be maintained above 99%, and the effluent met the national discharge standard (GB 31574-2015). This study presented an economically and environmentally sustainable approach for the evolution and industrial utilization of novel electrocoagulation technologies.
关键词：
S -type heterostructure;Tetracycline hydrochloride;Photocatalysis;tc-COF
摘要：
Photocatalytic oxidation is a promising technology for wastewater treatment. It is a more desirable method than other conventional wastewater treatment approaches due to its low cost, environmental friendly, and capability to completely degrade pollutants into environmentally safe products under appropriate conditions. Among some photocatalysts, covalent organic frameworks with high photoactivity are recognized as stable and feasible materials for this purpose. In this work, highly-effective photocatalyst of S-type heterostructure tc-COF was successfully synthesized by using ultrasonic delamination treatment sp2c-COF nanosheets (sp2c-NS) and py-NH2COF nanosheets (Py-NH2-NS) via a secondary solvent heating method. The preparation was initiated by synthesizing sp2c-COF and py-NH2-COF successfully adopting pyrene templates by solvothermal method. The study focused on physicochemical characterization and photocatalytic activity of tc-COF. The photocatalytic ability of tc-COF was carried out to degrade tetracycline under visible light. The results indicate that tc-COF not only shows excellent photocatalytic activity for tetracycline degradation of 94.8 % at 90 min under visible light illumination, but also has good photocatalytic degradation performance at wide initial pH values, coexisting ions, and actual water sources. Surprisingly, it has excellent stability and recyclability, it can afford high oxidative degradation (87.3 %) even after 5 successive recycles. The degradation mechanism was discussed by various methods such as active species trapping experiment, electron paramagnetic resonance determination and related electrochemical analysis. In addition, the main degradation intermediate products and the possible pathways of TC degradation were detected and proposed according to LC - MS technology. This work provided a new strategy for the preparation of hetero-structured COF which could be served as an advantageous photocatalyst for the treatment of pharmaceutical industry wastewater.
期刊：
Georgian Mathematical Journal,2024年 ISSN：1072-947X
通讯作者：
Sheibani, M
作者机构：
[Chen, Huanyin] Fuzhou Univ Int Studies & Trade, Sch Big Data, Fuzhou 350202, Peoples R China.;[Sheibani, Marjan; Sheibani, M] Semnan Univ, Farzanegan Campus, Semnan, Iran.;[Liu, Dayong] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
通讯机构：
[Sheibani, M ] S;Semnan Univ, Farzanegan Campus, Semnan, Iran.
关键词：
Group inverse;Drazin inverse;block-operator matrix;ring
摘要：
We present necessary and sufficient conditions under which the sum of two group invertible elements in a ring is group invertible. As applications, we establish the existence of group inverses of certain 2 x 2 {2\times 2} block-operator matrices over a Banach space. These generalize the known results, e.g., Zhou, Chen and Zhu (Comm. Algebra 48 (2020), 676-690) and Benitez, Liu and Zhu (Linear Multilinear Algebra 59 (2011), 279-289).
摘要：
Wood, as a uniquely ordered porous material, plays an indispensable role in energy storage devices. Here, wood shavings (WS) are utilized as a flexible substrate to form an electrode material with excellent flexibility. A conductive coating material made of spinnable carbon nanotube (CNT) film is applied onto the wood shavings, while polyaniline (PANI) nanoparticles are chemically polymerized in situ and deposited onto the CNT film to create flexible electrodes. CNTs offer optimal pathways for electron transport and establish stable connections among PANI particles. Furthermore, the incorporation of the CNT film causes an augmentation of the conductivity of WS substrate. The PANI/CNT@WS exhibits an outstanding specific capacity of 152.81 F g-1 at 0.2 A g-1. The flexible supercapacitor (FSC) presents a high specific capacitance of 45.89 F g-1 at 0.2 A g-1, and capacity rate is as high as 98.98 % after 1000 charge-discharge cycles. Even when bent to 120 degrees, the capacity remains 62.9 %. Therefore, the composite electrode demonstrates exceptional flexibility and excellent electrochemical performance.
摘要：
Tetracycline (TC) is a widely used antibiotic that accumulates in animal foods, posing a threat to human health and even causing environmental pollution. This research aimed to establish a rapid method for the detection of TC. To this end, sodium alginate-protected gold nanoclusters (SA-AuNCs) were synthesized, which combined with europium ions (Eu3+) to construct a ratiometric-sensing platform for the detection of TC. When added TC, Eu3+ interacted with TC could result in enhanced fluorescence at 620 nm, which was used as a response signal, while the fluorescence intensity of SA-AuNCs remained unchanged, acting as a reference signal. Accordingly, a linear relationship was established in a wide range of TC (0-60 mu M) and the detection limit (LOD) was 22.07 nM. The recoveries of the spiked samples ranged from 94.71 % to 109.73 %, implying that the as-proposed method could be successfully applied to detect TC in real samples. Furthermore, color information was extracted from the fluorescence images taken with a smartphone and analyzed by MATLAB, in which a visual mini program could be designed for calculating the channel values of red (R), green (G), and blue (B) of the generated fluorescence images. Utilizing the image processing functions and data processing capabilities of MATLAB, the obtained R/G values were selected for the semi-quantitative detection of TC in real samples without any time-consuming pretreatment and expensive instruments, demonstrating the great potential prospects of integrating MATLAB algorithm with SA-AuNCs-based ratiometric fluorescence probe into one ideal system for the development of rapid food assay.
摘要：
The key to enhancing the activation efficiency of peroxydisulfate (PDS) lies in facilitating the adsorption of PDS and accelerating the rate of electron transfer at the interface. In this work, the oxygen vacancy (Ovs) concentration of ultrathin Bi4Ti3O12 (BTO) was controlled in situ by high-energy electron beam bombardment. BTOV- 300 exhibited a significant activation effect on PDS. The degradation rate constant (kobs) for the removal of ciprofloxacin (CIP) was measured to be 0.2080 min 1 under visible light irradiation, which was 3.71 times greater than that of the original BTO. Density functional theory calculations uncovered the principal role of oxygen vacancies as active sites for PDS activation. Introducing OVs significantly boosted the adsorption energy of PDS on BTO and lengthened the O-O bond of PDS. This study represents the potential mechanism behind the activation of PDS by BTOV and provides valuable insights for enhancing the photoactivation efficiency of PDS.
摘要：
The conversion of extremely hazardous As(III) to less toxic As(V) and subsequent adsorption onto the catalyst surface holds an advisable process for arsenic contaminants treatment. However, the conflictual mechanism of oxidation and adsorptive remains a huge challenge and unexplored for arsenic removal. In this work, a dual regulation platform of C3N4/C3N5.4 molecular heterojunction was well designed and constructed. The optimized C3N4/C3N5.4 exhibited excellent photocatalytic As(III) oxidation rate and As(V) adsorption efficiency under water, fluorosilicic acid and phosphoric acid solutions. The excellent performance benefits from the molecular heterojunctions induced internal electronic interactions and a local polarization, which contributes to the for-mation of built-in electric field (BEF) for enhancing exciton dissociation and charge transfer. Furthermore, the optimized electronic structure serves as the adsorption and oxidation site for simultaneously promoting charge interaction with arsenic elements, which greatly reinforces the absorption of arsenic. Our work may pave the way to optimize the electronic structure of bifunctional material for arsenic remediation.
摘要：
A novel and efficient protocol for the synthesis of diarylallyl-functionalized phosphonates, phosphinates, and phosphine oxides through the zinc-catalyzed dehydroxylative phosphorylation of allylic alcohols with P(III)-nucleophiles via a Michaelis-Arbuzov-type rearrangement is reported. A broad range of allylic alcohols and P(III)-nucleophiles (P(OR)(3), ArP(OR)(2), and Ar(2)P(OR)) are well tolerated in this reaction, and the expected dehydroxylative phosphorylation products could be synthesized with good to excellent yields under the optimal reaction conditions. The reaction can be easily scaled up at a gram-synthesis level. Furthermore, through the step-by-step control experiments, kinetic study experiments, and (31)P NMR tracking experiments, we acquired insights into the reaction and proposed the possible mechanism for this transformation.
作者机构：
Hunan Botanical Garden, Changsha 410116, China;Hunan Changsha-Zhuzhou-Xiangtan City Cluster National Research Station of Forest Ecosystem, Changsha 410116, China;Author to whom correspondence should be addressed.;[Zhiqun Ye; Yingfang Zhu] College of Science, Central South University of Forestry and Technology, Changsha 410004, China;[Qiaoyun Li; Juyang Liao; Chan Chen; Yaqi Huang] Hunan Botanical Garden, Changsha 410116, China<&wdkj&>Hunan Changsha-Zhuzhou-Xiangtan City Cluster National Research Station of Forest Ecosystem, Changsha 410116, China
通讯机构：
[Yan Liu] H;Hunan Botanical Garden, Changsha 410116, China<&wdkj&>Hunan Changsha-Zhuzhou-Xiangtan City Cluster National Research Station of Forest Ecosystem, Changsha 410116, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
accumulation on leaves;particulate matter;green plants;microstructure of leaf surfaces
摘要：
With the rapid advancement of the global economy, there has been a noticeable escalation in the level of inhalable particulate matter (PM) pollution in the atmosphere. The utilization of plants has been recognized as an effective means to mitigate the escalation in the atmospheric PM concentration through the capture and retention of this particulate matter on their leaves. This research focuses on investigating the PM retention capacity of nine commonly found greening plant species in Changsha, China, located in the country’s mid-subtropical region. In this study, we employed an air aerosol generator (QRJZFSQ-II) and a portable leaf area meter (LI-3000C) to systematically evaluate the PM retention in unit leaf area for different PM values. In addition, the leaf surface structure was observed via scanning electron microscopy, and the relationship between the leaf microstructure and the retained particles was quantitatively analyzed. The results showed that (1) there were significant differences in the retention of TSP, PM10, and PM2.5 per unit leaf area among the nine greening tree species analyzed. Rosa saturata was found to have the best retention effect regarding TSP and PM2.5, and Rhododendron simsii was found to have the best retention effect regarding PM10. (2) There were significant differences in the contents of TSP and PM2.5 per leaf area among the different tree species with different life forms (p < 0.05), with the order of retention being shrub > arbor (needle leaves) > arbor (broad leaves). (3) Coniferous plants have a deep leaf surface texture, which is conducive to capturing more particles on their leaf surface, and (4) the long stomata diameter was significantly negatively correlated with PM retention, and the stomata density was significantly positively correlated with PM retention. However, the short diameter and small area of stomata demonstrated no significant correlation with PM retention (p < 0.05). Considering the selection of suitable tree species for greening in urban air pollution control, we suggest that Osmanthus fragrans, Pseudolarix amabilis, Rosa saturata, and Rhododendron simsii be used more frequently in urban areas affected by severe air pollution.
作者机构：
[Long S.; Xie J.; Qiu T.] School of Earth Science and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China;[Zhou C.] College of Science, Central South University of Forestry and Technology, Changsha, 410018, China;[Lin D.] National-Local Joint Engineering Laboratory of Geo-spatial Information Technology, Hunan University of Science and Technology, Xiangtan, 411201, China
通讯机构：
[Jian Xie] S;School of Earth Science and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
关键词：
Accuracy evaluation;Errors-in-observations;Errors-in-variables;Functional model modification;Linear structured weighted total least squares;Stochastic model modification
摘要：
A simple and easy-to-implement discrete approximation is proposed for one-dimensional higher-order integral fractional Laplacian (IFL), and our method is applied to discrete the fractional biharmonic equation, multi-term fractional differential model and fractal KdV equation. Based on the generating function, a fractional analogue of the central difference scheme to higher-order IFL is provided, the convergence of the discrete approximation is proved. Extensive numerical experiments are provided to confirm our analytical results. Moreover, some new observations are discovered from our numerical results. (c) 2023 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
关键词：
Li–S batteries;SnS2;cathode electrode;multihole carbon nanofibers;synergistical adsorption and catalyst
摘要：
Lithium-sulfur (Li-S) batteries exhibit a huge potential in energy storage devices for the thrilling theoretical energy density (2600 Wh kg(-1)). Nevertheless, the serious shuttle effect rooted in polysulfides and retardative hysteresis reaction kinetics results in inferior cycling and rate performances of Li-S batteries, impeding commercial applications. In order to further promote the energy storage abilities of Li-S batteries, a unique binder-free sulfur carrier consisting of SnS(2)-modified multi-hole carbon nanofibers (SnS(2)-MHCNFs) has been constructed, where MHCNFs can offer abundant space to accommodate high-level sulfur and SnS(2)can promote the adsorption and catalyst capability of polysulfides, synergistically promoting the lithium-ion storage performances of Li-S batteries. After sulfur loading (SnS(2)-MHCNFs@S), the material was directly applied as a cathode electrode of the Li-S battery. The SnS(2)-MHCNFs@S electrode maintained a good discharge capacity of 921 mAh g(-1)after 150 cycles when the current density was 0.1 C (1 C = 1675 mA g(-1)), outdistancing the MHCNFs@S (629 mAh g(-1)) and CNFs@S (249 mAh g(-1)) electrodes. Meanwhile, the SnS(2)-MHCNFs@S electrode still exhibited a discharge capacity of 444 mAh g(-1)at 2 C. The good performance of SnS(2)-MHCNFs@S electrode indicates that combining multihole structure designation and polar material modification are highly effective methods to boost the performances of Li-S batteries.
作者机构：
[Liu, Xu-heng; Zhao, Zhong-wei; He, Li-hua; Sun, Feng-long; Li, Jiang-tao; Zhang, Ning; Li, Zhi-chao; Luo, Yong-jin; Chen, Xing-yu] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Zhao, Zhong-wei; Li, Jiang-tao] Cent South Univ, Key Lab Hunan Prov Met & Mat Proc Rare Met, Changsha 410083, Peoples R China.;[Zhang, Ning] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
通讯机构：
[Li, JT; Li, JT ; Zhang, N ] C;Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;Cent South Univ, Key Lab Hunan Prov Met & Mat Proc Rare Met, Changsha 410083, Peoples R China.;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
摘要：
β-ammonium tetramolybdate[β-(NH4)2Mo4O13]was prepared in a concentric structure reactor.The species and microstructure of Mo with the change of solution acidity in the preparation process were investigated.The results showed t...MORE β-ammonium tetramolybdate[β-(NH4)2Mo4O13]was prepared in a concentric structure reactor.The species and microstructure of Mo with the change of solution acidity in the preparation process were investigated.The results showed that the pH of the solution should be controlled below 2.5 to obtain ammonium tetramolybdate crystals.In the acidification process,NH3∙H2O was used to adjust the pH back to about 3.0 to dissolve the fine crystals produced and facilitate the conversion of ammonium heptadmolybdate to ammonium tetramolybdate.Decreasing the soaking time between the(NH4)4Mo4O12(O2)2∙2H2O crystals and the original liquor was beneficial to obtaining β-(NH4)2Mo4O13.Based on the polymerization mechanism of molybdenum,a multi-lattice concentric circle reactor was designed to realize the regional regulation of ammonium molybdate crystallization.High-quality β-(NH4)2Mo4O13 was prepared continually by periodically adding HNO3 solution,ammonia water,and product slurry under specified conditions.FEWER
期刊：
Chemical Engineering Journal,2024年479:147753 ISSN：1385-8947
通讯作者：
Guo, X;Wu, YQ
作者机构：
[Zhang, Xuefeng; Guo, Xin; Qi, Xinmiao; Ouyang, Jiayu] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Yi, Xueqian] Hunan Inst Traff Engn, Hengyang 421200, Peoples R China.;[Wu, Yiqiang; Wang, Shiqi; Jiang, Ping] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Xu, Dong] Cent South Univ Forestry & Technol, Coll Food Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Wu, YQ ; Guo, X ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Hydrogel;Adsorption;Detection;Iodide
摘要：
To remove iodine, a novel chitosan/carbon dots-loaded nanocellulose/layered double hydroxide composite hydrogel (CCNL) was successfully synthesized to enable the simultaneous detection and removal of the iodide ion (I-). Adsorption experiments revealed that the CCNL exhibited an impressive maximum adsorption capacity of 231.9 mg/g at 25 degrees C. The adsorption isotherms closely conformed to the Langmuir model, and the adsorption kinetics followed the pseudo-second-order model. The CCNL demonstrated outstanding reusability, maintaining over 89.7 % of its initial adsorption capacity after six cycles. Furthermore, it exhibited remarkable temporal stability, preserving over 91.0 % of its initial adsorption capacity after storage for 15 weeks. In addition, the CCNL exhibited remarkable selectivity and sensitivity in detecting I-, with a low limit of detection (0.09 mu g/L) within the linear ranges of 5-150 mg/L and 0.2-1.0 mu g/L. Fluorescence quenching was attributed to a dynamic process. Importantly, cost analysis revealed that the cost of the removal of I- per gram using the CCNL was only CNY 0.16 (USD 0.02). This was significantly lower than the cost of removal using activated carbon, which was CNY 3.87 (USD 0.53). This study provides a foundation for the development and production of a long-term, stable, reusable, cost-effective, and multifunctional adsorbent for managing iodide pollution.
摘要：
Nitrogen deficient porous nanosheets(NDCN) are a promising nano template that can combine defect engineering with Mn-FeOOH to suppress photo generated carrier complexation and optimize electron distribution. In this study, a unique structure with N/O double vacancies in Mn-FeOOH@NDCN was prepared using a magnesium thermal denitrification co-precipitation method. Furthermore, a series of Mn-FeOOH/NDCN/PMS reaction systems were constructed by adjusting the dosage of peroxymonosulfate(PMS). The experimental results indicate that the synergistic activation of N/O double vacancies on PMS enables the Mn-FeOOH/NDCN/PMS system to oxidize almost 10 mg/L of As(III) within 90 min. At the same time, the oxidized As(V) was completely adsorbed, thereby completely removing the total arsenic in the water. The reasonable construction of carbon networks is a prerequisite for the stability of Mn-FeOOH/NDCN composite catalysts, enabling them to have good cyclic stability. The experimental results confirm that oxygen vacancies directly participate in the activation of PMS, while nitrogen vacancies effectively adsorb As(III), thereby promoting the contact between As(III) and PMS, improving the mass transfer rate, and accelerating the catalytic degradation process. This study will provide a new way to completely remove arsenic pollution from water bodies.
摘要：
The interaction process between phosphorus and arsenic is of great significance for controlling arsenic pollution by iron oxide minerals. In this work, the alpha-FeOOH@hydrothermal carbonisation (HTC) composites with abundant oxygen vacancy were synthesized by a hydrothermal method using HTC as a carrier and were used for the removal of arsenic in different phosphate environments. The surface hydroxyls (OHs) in alpha-FeOOH promote the production of OVs on the surface of the composite and improve the adsorption capacity of As(III). The experiment results showed that the maximum adsorption capacity of alpha-FeOOH@HTC on As(III) under the influence of PO43-, HPO42-, and H2PO4- were 8.76 mg center dot g(-1), 10.67 mg center dot g(-1) and 10.21 mg center dot g(-1), respectively. Infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analysis showed that after adsorption, a characteristic peak of As(III) was generated on the FeOOH@HTC surface. The possible adsorption mechanism for As (III) by alpha-FeOOH@HTC is the surface complexation and precipitation of M-OH as well as Fe-OH-Fe with As (III). After the application of composite materials in rice seedling hydroponic experiments, it was found that they have a certain degree of biological safety, providing a theoretical basis for reducing arsenic pollution. This work studies the adsorption behavior of OVs on As(III) and provides a new approach to address arsenic contamination in water.
