期刊：
Separation and Purification Technology,2024年340:126840 ISSN：1383-5866
通讯作者：
Wenlei Wang<&wdkj&>Yiqiang Wu
作者机构：
[Jing Wang; Zhen Zhang; Hui Wang; Yiqiang Wu] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Wenlei Wang; Yao Deng; Ting Yang] College of Science, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Wenlei Wang; Yiqiang Wu] C;College of Science, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
摘要：
Chiral nanomaterials typically exhibit special optical activities, such as optical rotation and chiral photomechanics, and have enormous potential for applications in molecular chiral photocatalysis and other fields. In this work, cellulose nanocrystals (CNCs) were obtained from renewable and affordable bamboo resources through the steps of delignification, hemicellulose removal and acid digestion. Meanwhile, ZIF-8 materials with truncated rhombic dodecahedral structure were obtained by liquid-phase synthesis from Zn2+ coordinated with 2-methylimidazole (2-MiM). And then, the topologically chiral CNCs@ZIF-8 3D network was successfully constructed by using CNCs as a bridge to graft with ZIF-8 through the formation of Zn–N–S and Zn–O–S bonds. The photoreduction yield of CO2 to CO by CNCs@ZIF-8 (α = +21.290) with topological chirality was 301.16 μmol−1·g−1, which was 9.43 times that of ZIF-8 (α = 0.000). Density functional theory (DFT) calculations confirm that Zn–O–S with a larger bond angle (118.0°) was conducive to charge accumulation. Photoelectric test results show that CNCs can improve the electron transport ability and reduce the rate of photogenerated electron-hole complexation in ZIF-8. This work elucidated the mechanism of chiral auxiliaries in photocatalytic reduction of CO2 and provided a new strategy for photocatalytic reduction of CO2.
摘要：
Development of novel sulf-functionalized porous organic polymers (POPs) for Mercury (II) (Hg(2+)) removal is of great significant, but the adsorbents always suffered by the low adsorption capacity, stability, and efficiency for the reason that the common construction of functionalized POPs from the functionalized monomers or post-functionalization of the POPs always sacrifice the porosity. In this paper, porphyrin-based POPs with different heteroatoms were constructed through the aldehyde monomer (benzene, 2,5-thiophenedicarboxaldehyde and thieno[3,2-b]thiophene-2,5-dicarboxaldehyde) and pyrrole according to the Adler-Longo method. In this way, nitrogen (N) in pyrrole and sulfur (S) in thiophene structures were embed into the backbone structure of the polymers. The functional structures not only act as the linking building block into the stable cross-linking structure, but also offer abundant uncovered functional sites for Hg(2+) adsorption, resulting the porphyrin-based POPs high Hg(2+) capacity (1049mg/g), removal efficiency (more than 99.9%), good reusability and selectivity for its highest heteroatoms contents. The adsorption mechanism confirmed the cooperative coordination of N in porphyrin and S in thiophene with Hg(2+). This work confirmed the functional groups play more important role in heavy metal adsorption, and the embedded functional sites into backbone also promotes the stability and the adsorption performance.
摘要：
Hydrogel, a common carrier of photocatalyst that suffers from compromised catalytic efficiency, is still far from practical application. Herein, based on "computer chip-inspired design", a novel nanocellulose/carbon dots hydrogel (NCH) was fabricated as superior intensifier instead of common carrier of sodium titanate nanofibre (STN), where carbon dots (CDs) enhanced amino group-induced adsorption for Cr(VI), promoted photocatalytic properties of STN via transferring the photogenerated electron-hole pairs and improved amino group-induced desorption for reduced product (Cr(III)) via electrostatic repulsion, showing an efficiency of 1+1>2. Adsorption and photocatalysis experiments demonstrated superior removal performance of the NCH incorporating STN, as shown by theoretical maximum adsorption capacity of 425.74mg/g and kinetic constant of 0.0374min(-1) in the photocatalytic process, which was nearly 6.6 and 7.3 times of STN. A series of experiments was conducted to confirm the novel mechanism of CDs-enhanced adsorption-photocatalysis-desorption synergy. This work not only provides new insights into the fabrication of a superior intensifier for nanosized photocatalyst, but also proposes one new mechanism of CDs-enhanced adsorption-photocatalysis-desorption synergy, which is helpful for designing and optimizing nanosized photocatalyst.
作者机构：
[Shen, Xingdong; Zhou, Cui; Zhou, C] Cent South Univ Forestry & Technol, Coll Comp & Informat Engn, Changsha 410004, Peoples R China.;[Shen, Xingdong; Zhou, Cui; Zhou, C] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Zhu, Jianjun] Cent South Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China.
通讯机构：
[Zhou, C ] C;Cent South Univ Forestry & Technol, Coll Comp & Informat Engn, Changsha 410004, Peoples R China.;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
关键词：
least squares collocation method;systematic error;random error;TanDEM-X DEM;ICESat-2
摘要：
The TanDEM-X Digital Elevation Model (DEM) is limited by the radar side-view imaging mode, which still has gaps and anomalies that directly affect the application potential of the data. Many methods have been used to improve the accuracy of TanDEM-X DEM, but these algorithms primarily focus on eliminating systematic errors trending over a large area in the DEM, rather than random errors. Therefore, this paper presents the least-squares collocation-based error correction algorithm (LSC-TXC) for TanDEM-X DEM, which effectively eliminates both systematic and random errors, to enhance the accuracy of TanDEM-X DEM. The experimental results demonstrate that TanDEM-X DEM corrected by the LSC-TXC algorithm reduces the root mean square error (RMSE) from 6.141 m to 3.851 m, resulting in a significant improvement in accuracy (by 37.3%). Compared to three conventional algorithms, namely Random Forest, Height Difference Fitting Neural Network and Back Propagation in Neural Network, the presented algorithm demonstrates a reduction in the RMSEs of the corrected TanDEM-X DEMs by 6.5%, 7.6%, and 18.1%, respectively. This algorithm provides an efficient tool for correcting DEMs such as TanDEM-X for a wide range of areas.
通讯机构：
[Zhang, LT; Liu, EX ] C;Cent South Univ Forestry & Technol, Coll Comp & Informat Engn, Changsha 410004, Peoples R China.
关键词：
D -shaped photonic crystal fiber;Refractive index sensor;Ag-grating;Mid -infrared region
摘要：
In this paper, an ultra-high sensitive plasmonic sensor is theoretically proposed for refractive index based on D-shaped photonic crystal fiber (PCF) with graphene-coated Ag-grating in mid-infrared region. Surface plasmon polariton at the metal/dielectric interface can be effectively excited by the fundamental guiding mode, leading to the surrounding medium-dependent loss spectrum. This metallic-grating PCF sensor exhibits a maximum sensitivity of 18612 nm/RIU with a detection resolution of 4.16 x 10-6 RIU in the index range from 1.33 to 1.395. Dependences of loss spectrum on the PCF parameters (air hole diameter and lattice constant) and the grating structure (grating thickness, period and width) are systematically analyzed. Moreover, the in-fluence of the material parameters on the sensor performance is also investigated in term of graphene-layer number and the thickness of Ag layer. The compact design not only has great potentials in the applications of liquid detection, but also offers a guidance in the engineering of the metallic-grating fiber sensor.
通讯机构：
[Zeng, DW ] C;Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China.
摘要：
A ZnSO4 electrolyte solution with impuritysalts suchas MnSO4 and MgSO4 is often used in zinc hydrometallurgicalprocesses over a wide temperature range. CaSO4 center dot 2H(2)O(s) scaling and fluorine corrosion are two encountered problemsin the process. Understanding the CaF2(s) solubility behaviorin MSO4 (M = Zn, Mn, Mg) aqueous solutions at various temperatureshelps remove Ca2+ and F- ions from thesolution. However, CaF2(s) solubility data, especiallyat temperatures >298 K, have not been published yet. In this work,CaF2(s) solubilities in the CaF2-CaSO4-MSO4-H2O (M = Zn, Mn,Mg) quaternary systems and its subsystems of the CaF2-MSO4-H2O (M = Zn, Mn, Mg) at 348.15 K and theCaF(2)-CaSO4-MSO4-H2O (M = Zn, Mg) quaternary systems and the CaF2-MgSO4-H2O ternary system at 298.15 K are systematicallymeasured. The results show that the CaF2(s) solubilityin the MSO4 (M = Zn, Mn, Mg) aqueous solution of a certainconcentration at 348.15 K is considerably higher than that at 298.15K. At 298.15 and 348.15 K, the salting-in effect of MSO4 (M = Zn, Mn, Mg) on CaF2(s) solubility is enhanced withthe order ZnSO4 < MnSO4 < MgSO4. At both temperatures, CaF2(s) solubilities in CaSO4 center dot 2H(2)O(s)- or CaSO4(s)-saturatedMSO(4) (M = Zn, Mn, Mg) aqueous solutions are generally lowerthan those in pure MSO4 (M = Zn, Mn, Mg) aqueous solutions.Particularly, the salting-in effect of MgSO4 on CaF2 is so strong that CaF2(s) dissolves completelyand is converted to CaSO4 center dot 2H(2)O(s) and MgF2(s) in a concentrated MgSO4 aqueous solution. Hence,this study indicates that high temperatures and high salt concentrationsincrease the CaF2(s) solubility, making the removal ofCa(2+) and F- ions from the system challenging.Further, the existence of impurity salts MnSO4 and MgSO4 makes it more difficult.
关键词：
public welfare forest;biomass;vegetation type;spatial pattern;driving factors
摘要：
An ecological public welfare forest is an important basis for the construction of national ecological security. This study took public welfare forests at the provincial level or above in Hunan Province as the research object. Based on the in situ monitoring data and remote sensing data, we constructed a random forest (RF) model for inversing the biomass of public welfare forests with different types. Then, based on the inversion results, we investigated the biomass spatial pattern. Combined with topographical and socio-economic factors, we constructed a geographically weighted regression (GWR) model to analyze the biomass driving factors of different vegetation types in public forests. The results showed the following: (1) The biomass of public welfare forests in Hunan Province presented a strip distribution pattern that gradually increases from the central to the southwest and northeast. The total biomass of public welfare forests in Hunan Province was 338.13 million tons, with an average biomass of 68.31 t center dot hm(-2). In the different types of public welfare forests, the mean biomass of the types were as follows: shrub (4.65 t center dot hm(-2)) < broadleaf forest (59.27 t center dot hm(-2)) < conifer-broadleaf mixed forest (62.44 t center dot hm(-2)) < bamboo forest (71.33 t center dot hm(-2)) < coniferous forest (100.33 t center dot hm(-2)). (2) Topographic and socio-economic factors have a significant impact on the spatial pattern of biomass in public welfare forests. Slope had the greatest effect on coniferous forest, conifer-broadleaf mixed forest, and shrub forest, while POP had the greatest effect on broadleaf forest and bamboo forest. This study investigates the spatial patterns and driving factors of biomass in public welfare forests at the provincial level, filling the gap in forest biomass monitoring in public welfare forests in Hunan Province. It provides a new method to improve the accuracy of forest biomass estimation and data support for the sustainable management of public welfare forests.
摘要：
A novel 3D stacked corrugated pore structure of polyaniline (PANI)/CoNiO(2)@activated wood-derived carbon (AWC) has been successfully constructed to prepare high-performance electrode materials for supercapacitors. AWC functions as a supporting framework that provides ample attachment sites for the loaded active materials. The CoNiO(2) nanowire substrate, consisting of 3D stacked pores, not only serves as a template for subsequent PANI loading, but also acts as an effective buffer to mitigate the volume expansion of the PANI during ionic intercalation. The distinctive corrugated pore structure of PANI/CoNiO(2)@AWC facilitates electrolyte contact and significantly enhances the electrode material properties. The PANI/CoNiO(2)@AWC composite materials exhibit excellent performance (14.31F cm(-2) at 5mAcm(-2)) and superior capacitance retention (80% from 5 to 30mAcm(-2)), owing to the synergistic effect among their components. Finally, PANI/CoNiO(2)@ AWC//reduced graphene oxide (rGO)@AWC asymmetric supercapacitor is assembled, which has a wide operating voltage (0∼1.8V), high energy density (4.95mWhcm(-3) at 26.44 mW cm(-3)) and cycling stability (90.96% after 7000 cycles).
通讯机构：
[Yang, T ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
关键词：
Arsenic removal;C–O–Ti interfacial chemical bonds;Nitrogen defect;O–As and hydrogen bonds
摘要：
The efficient removal of arsenic from wastewater is still a challenge. In this paper, a heterojunction consisting of in-situ carbon-doped TiO(2) and nitrogen deficiency g-C(3)N(4) (C/TiO(2)@ND-C(3)N(4)) has been constructed, which can completely oxidize As(III) (10,000μg/L, 40mL) to As(V) within 12min under visible light and simultaneously adsorb total As (95.0%) with the pseudo-secondary kinetic equation, superior than in-situ carbon-doped TiO(2) (75.0%) and nitrogen deficiency g-C(3)N(4) (50.5%). The good photocatalytic oxidation and adsorption performances of C/TiO(2)@ND-C(3)N(4) on As(III) removal can be attributed to the successful synthesis of heterojunction. On one hand, the building of C-O-Ti interfacial chemical bonds enable rapid electron transfer and improve the efficiency of photocatalytic oxidation. On the other hand, the decreased As(V) adsorption energy resulted from the synthesized heterojunction boost the adsorption capability of As(V), which was completed by the generation of O-As bonds with oxygen-containing functional groups on the surface of TiO(2) and hydrogen bonds with high content pyrrole nitrogen derived from ND-C(3)N(4), respectively. The results manifest that the preparation of bifunctional materials with both photocatalytic oxidation and adsorption properties provides a new strategy to achieve the removal of As.
作者：
Zhenzhen Wang;Jia Zhang;Zhihuan Liu;Shaomiao Chen;Danqing Lu
期刊：
2023 IEEE 10th International Conference on Cyber Security and Cloud Computing (CSCloud)/2023 IEEE 9th International Conference on Edge Computing and Scalable Cloud (EdgeCom),2023年:292-297
作者机构：
[Zhihuan Liu] College of Computer & Information Engineering, Central South University of Forestry and Technolog, Changsha, Hunan, China;[Zhenzhen Wang; Jia Zhang; Danqing Lu] College of Science, Central South University of Forestry and Technology, Changsha, Hunan, China;[Shaomiao Chen] School of Computer Science and Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China
摘要：
In many computer-aided spinal imaging and disease diagnosis, automating the segmentation of the spine and cones from CT images is a challenging problem. Therefore, in this paper, we propose a triple channel expansion attention segmentation network based on U-Net for spinal CT images. We design a triple channel expansion attention to solve the problem of low accuracy caused by the loss of important feature information in the downsampling process of ordinary convolution, which uses different sizes of convolution set kernels to extract different features. Then through this attention, we output a feature image for each layer of the down-sampling, and finally skip connection with it during the up-sampling. Finally, many experimental results on VerSe 2019 and VerSe 2020 datasets show that our proposed network is superior to other prior art segmentation networks.
摘要：
Dowel-bearing behavior is one of the key material characteristics in the design of laterally loaded joints with dowel-type fasteners and provides its strength and stability of structures. In this study, the dowel-bearing behavior of bolted joints on bamboo scrimber were investigated by analyzing the effect of specimen size, bolt diameter and loading direction on the dowel-bearing behavior. The estimation formulas of dowel-bearing strengths of bamboo scrimber for engineering utilization were developed based on conducting on 16-group experiments comprising a total of 80 half-hole samples. The results indicate that the initial stiffness was affected by the bolt diameter, sample thickness and loading direction. Dowel-bearing strength was only affected by bolt diameter and it decreased gradually with the increase in bolt diameter, irrespective of specimen sizes and loading direction. The failure mechanisms of the samples loaded in parallel- and perpendicular-to-grain were completely different. The existing empirical expressions was suitable for bamboo scrimber loaded in parallel-to-grain when larger bolts were used, but can under-estimate the dowel-bearing strengths in perpendicular-to-grain direction. Finally, semi-empirical regression-based formulas as functions of compressive strength and bolt diameter were proposed, which exhibited good agreement with the experimental dowel-bearing strength. The findings will be useful for designing safe and efficient bolted joints to promote more widespread use of bamboo scrimber in construction, as well as supplying basic data for systematic development of test and design standards for bamboo structures.
通讯机构：
[Yang, T ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
关键词：
As(III) photocatalytic oxidation;Interfacial chemical bonds;Sn/N co-doping TiO2;Visible light excitation
摘要：
The photocatalytic oxidation technology has been verified as an effective method to oxidize As(III) to As(V) with low toxicity and the photocatalyst with perfect performances is still the core factor in the treatment procedure. In this paper, a high property photocatalyst of Sn/N co-doping TiO2 (Sn/N-TiO2) has been synthesized and applied to the photocatalytic oxidation of As(III). Through a series of characterization methods, it is proved that Sn and N atoms have been effectively doped into the crystal structure of TiO2, which makes the optical absorption wavelength of TiO2 extend from ultraviolet light to visible light region. At the same time, the presence of O-Ti-N bonds can offer an efficient electron moving path and further improve the photogenerated electron transfer rate, so as to enhance the photocatalytic oxidation effect. The synthesized Sn/N-TiO2 photocatalyst only takes 21 min to realize complete oxidation of As(III) (10,000 mu g/L, 40 mL) to As(V) under visible light, superior to N-doped TiO2 (27 min) and Sn doped TiO2 (24 min) photocatalysts. The achievements of such efficient photocatalytic oxidation performances result from the synergistic interaction of hydroxyl radicals (center dot OH), superoxide radical (center dot O-2(-)), and hole (h(+)) formed in the photocatalytic oxidation process and the O-Ti-N bond formed by co-doping. This paper provides a new insight for solving arsenic pollution by photocatalytic oxidation technology.y
期刊：
Numerical Methods for Partial Differential Equations,2023年39(4):2763-2786 ISSN：0749-159X
通讯作者：
Jiming Yang<&wdkj&>Jiming Yang Jiming Yang Jiming Yang
作者机构：
[Yang, Jiming] Cent South Univ Forestry & Technol, Coll Sci, Changsha, Peoples R China.;[Su, Yifan; Yang, Jiming] Hunan Inst Engn, Sch Computat Sci & Elect, Xiangtan, Peoples R China.;[Zhou, Jing] Hunan Inst Engn, Ctr Higher Educ Res, Xiangtan, Peoples R China.;[Yang, Jiming] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Jiming Yang; Jiming Yang Jiming Yang Jiming Yang] C;College of Science, Central South University of Forestry and Technology, Changsha, China<&wdkj&>School of Computational Science and Electronics, Hunan Institute of Engineering, Xiangtan, China
摘要：
Abstract An incompressible miscible displacement problem in porous media is studied. A two‐grid algorithm based on an interior penalty discontinuous Galerkin method is proposed. With this algorithm, solving a nonlinear system on the discontinuous finite element space is reduced to solving a nonlinear problem on a coarse grid and a linear problem on a fine grid. The error estimate for the concentration in H1‐norm and the error estimate for the velocity in L2‐norm are obtained. The numerical experiments are provided to confirm our theoretical analysis.
摘要：
Antibiotic-containing wastewater is a typical biochemical refractory organic wastewater and general treatment methods cannot effectively and quickly degrade the antibiotic molecules. In this study, a novel boron-doped diamond (BDD) pulse electrochemical oxidation (PEO) technology was proposed for the efficient removal of levofloxacin (LFXN) from wastewater. The effects of current density (j), initial pH (pH(0)), frequency (f), electrolyte types and initial concentration (c(0)(LFXN)) on the degradation of LFXN were systematically investigated. The degradation kinetics under four different processes have also been studied. The possible degradation mechanism of LFXN was proposed by Density functional theory calculation and analysis of degradation intermediates. The results showed that under the optimal parameters, the COD removal efficiency (η(COD)) was 94.4% and the energy consumption (EEC) was 81.43 kWh·m(-3)att=120min. The degradation of LFXN at pH=2.8/c(H(2)O(2)) followed pseudo-first-order kinetics. The apparent rate constant was 1.33×10(-2) min(-1), which was much higher than other processes. The degradation rate of LFXN was as follows: pH=2.8/c(H(2)O(2))>pH=2.8>pH=7/c(H(2)O(2))>pH=7. Ten aromatic intermediates were formed during the degradation of LFXN, which were further degraded to F(-), NH(4)(+), NO(3)(-), CO(2) and H(2)O. This study provides a promising approach for efficiently treating LFXN antibiotic wastewater by pulsed electrochemical oxidation with a BDD electrode without adding H(2)O(2).
