ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Weicheng Li,Jiangyi Wu,Xiaojia Huang
Extraction strategy is designed for the pretreatment of low contents of aromatic N- and S-containing compounds (ANSCs) in environmental waters prior to chromatographic analysis . To enrich studied ANSCs effectively, poly (9-vinylanthracene/4-vinylphenylboronic acid- co -ethylene dimethacrylate/divinylbenzene) polymeric monolithic sorbent were facilely fabricated using the one-step free radical polymerization . Various technologies were employed to investigate the structure and morphology of the resultant monolith. Combining with solid-phase microextraction format, the sorbent exhibited satisfying concentrated performance for ANSCs through multiply interactions under the optimized conditions. After desorption with eluent , the retained analytes were analyzed by HPLC. Results showed that the extraction efficiencies ranged from 51.6 to 93.2%. The linear ranges and limits of detection were 0.01–150 μg/L and 0.63–2.64 ng/L, respectively. Furthermore, the precisions were all below 10%. The introduced approach was productively practiced on three real water samples for simultaneous quantification of studied ANSCs, and the fortified recoveries ranged from 81.5 to 118%. All the results well evidenced that prepared sorbent can enrich ANSCs effectively and the introduced method is reliable alternative for routine analysis of ANSCs in environmental waters.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Feihu Mu,Shengpan Xu,Meixin Li,Yuqiu Yang,Xiaozhong Chu,Zhipeng Cheng,Xujing Guo,Jiming Xu,Benlin Dai,Chang-Ha Lee
Large amounts of carbon are stored primarily in dissolved organic matter (DOM), which plays an important indicator of lake eutrophication. However, removing DOM from eutrophic lakes remains a major challenge. Herein, a novel S-scheme flower-like microsphere BiVO 4 /nanosheet g-C 3 N 4 3D/2D heterojunction was successfully constructed using a two-step method for DOM degradation of real eutrophic lake water in the presence of peroxydisulfate (PDS). 1.0-BiVO 4 /g-C 3 N 4 /PDS exhibited highly efficient photocatalytic performance with an 87.8 % removal rate of DOM for 60 min, which was 5.3 and 8.9 times higher than BiVO 4 /PDS and g-C 3 N 4 /PDS, respectively. Sulfate radical (·SO 4 − ), hydroxyl radical (·OH) and singlet oxygen ( 1 O 2 ) were mainly responsible for DOM degradation in the 1.0-BiVO 4 /g-C 3 N 4 /PDS system, and the transformation pathway of 1 O 2 was emphatically analyzed. In addition, the changes of fluorescence components in DOM were detected using synchronous fluorescence spectra, second derivative spectra, and two-dimensional correlated spectroscopy analysis. Humic-like fluorescence, fulvic-like fluorescence, and protein-like substances were removed higher than 85.30 %, 73.02 %, and 67.23 % by the 1.0-BiVO 4 /g-C 3 N 4 catalyst activating the PDS under visible light (VL), respectively. When the toxicity of catalytically treated eutrophic lake water was estimated by growth inhibition of Escherichia coli , the biotoxicity of DOM decreased continuously in the BiVO 4 /g-C 3 N 4 /PDS/VL coupling process. Theoretical calculations and photoelectrochemical tests suggested that the BiVO 4 /g-C 3 N 4 /PDS catalytic activity enhancement was attributed to the S-scheme mechanism and hybrid advanced oxidation process. It is expected that this work can provide new insight into DOM degradation in eutrophic lake water by the heterogeneous photocatalysis combined with the PDS activation system.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Zhao Benhui,Deng Yueqing,Cao Lei,Zhu Jichun,Zhou Zhengji
Kesterite-structured Cu2ZnSn(S,Se)4 (CZTSSe) thin film photovoltaics have attracted considerable attention in recent years because of its low-cost and eco-friendly raw material, as well as high theoretical conversion efficiency. However, its photovoltaic performance is hindered by large open-circuit voltage (VOC) deficiency due to the presence of intrinsic defects and defect clusters in the bulk of CZTSSe absorber films. The doping of extrinsic cation to the CZTSSe matrix was adopted as an effective strategy to ameliorate defect properties of the solar cell absorbers. Herein, a novel Se&Sb2Se3 co-selenization process was employed to introduce Sb into CZTSSe crystal lattice. The results reveal that Sb-doping plays an active role in the crystallization and grain growth of CZTSSe absorber layer. More importantly, one of the most seriously detrimental SnZn deep defect is effectively passivated, resulting in significantly reduced deep-level traps and band-tail states compared to Sb free devices. As a result, the power conversion efficiency of CZTSSe solar cell is increased significantly from 9.17% to 11.75%, with a VOC especially enlarged to 505 mV from 449 mV. This insight provides a deeper understanding for engineering the harmful Sn-related deep defects for future high-efficiency CZTSSe photovoltaic devices.
研究领域:
材料科学
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光伏技术
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半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 3
·964-977
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IF 3.5
Zhu Q.,Wei S.,Wang C.,Yang X. B.,Zhou B.,Xie Z. X.,Duan Z. Q.,Hu Y. M.
Unique wool-ball shaped nanocrystalline CoS was synthesized using solvothermal method in which dopamine (DA) was added as carbon source to combine with the CoS. The DA in situ polymerized and coated on the CoS particle surfaces during the solvothermal process. N, S co-doped carbon-encapsulated CoS(Co 9 S 8 ) were achieved after a post carbonization. In the composites, CoS(Co 9 S 8 ) nanocrystals and carbon are tightly bound and embedded into the amorphous carbon layer to form a spherical core–shell structure. Hybrid counter electrodes (CEs) fabricated with the product have good conductivity, dispersion and stability due to the synergetic effect between carbon and nanocrystalline CoS(Co 9 S 8 ). Charge transfer through the CE/electrolyte interfaces is improved by dopamine-carbon combination. In the optimal case, PCE of 8.82% of the dye-sensitized solar cells (DSSCs) with the hybrid CEs was achieved, which is close to that of the cell with Pt (8.86%) CE, and is a 41.12% increase compared with that of CoS CE cell with the structure of photoanode/N719/electrolyte (I − /I 3 − )/CE. Moreover, stability of the cells with the composite CEs was greatly improved. The results demonstrate that the as-prepared composites are promising alternatives to Pt-CEs for high-performance DSSCs. The reported preparation method will guide further developments in highly efficient carbon-based catalysts for electrochemistry and energy related applications.
研究领域:
材料科学
·
能源技术
·
电化学
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纳米技术
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太阳能电池
✓ 已验证
DOI
高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
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2022
·
IF 4.907
Shunli Hu,Long Zhang,Guiping Liu,Yufeng Gan,Baozhan Wang,Fang Wang,Jiandong Jiang
Rac-dichlorprop [( R , S )-2-(2,4-dichlorophenoxy)propanoic acid], a commonly used chiral phenoxyalkanoic acid herbicide, is frequently detected in various environments, posing threats to human health and environmental safety. The ( S )-enantiomer of dichlorprop shows a lower herbicidal activity but a higher toxicity as compared to the ( R )-enantiomer of dichlorprop. It is of great importance to enantioselectively remove the non-herbicidal ( S )-dichlorprop from the rac -dichlorprop in the application sites. In this study, the dissipation of ( R )- and ( S )-dichlorprop in an agricultural soil was investigated. We found that the dissipation rate of ( S )-dichlorprop was higher than that of ( R )-dichlorprop in an agricultural soil. Although the influences of different enantiomers of dichlorprop on soil bacterial community were not different, Sphingobium was significantly enriched in the ( S )-dichlorprop-treated soil as compared to ( R )-dichlorprop, indicating that Sphingobium species played important roles in the dissipation of ( S )-dichlorprop. Furthermore, a bacterial consortium containing Sphingobium sp. strain SP-2 (enantioselectively transforming ( S )-dichlorprop to 2,4-dichlorophenol) and Sphingopyxis sp. strain DP-21 (mineralizing 2,4-dichlorophenol), which synergistically mineralized the ( S )-enantiomer of dichlorprop, was isolated from the agricultural soil. Bioaugmentation with the in-situ isolated consortium (strains SP-2 and DP-21) resulted in the enhanced removal of the non-herbicidal ( S )-dichlorprop from the soil and in the adaptation of the inoculated degrading strains. This study offers new insights into the enhanced bioremediation of the non-herbicidal ( S )-dichlorprop contaminated soils while simultaneously ensuring environmental safety and crop yield.
研究领域:
环境科学
·
微生物学
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土壤学
·
生物修复
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
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2020
·
IF 3.421
Cheng Yang,Chengyong Shu,Zhuofan Gan,Chen Lai,Jijun Ma,Wei Tang,Yuping Wu
ZIF-8-derived Fe–N–S triple doping hollow-shell nanoparticles are prepared by the surface modification of SCN– ligands. Fe3+ ions are highly adsorbed on the SCN–-modified layer, forming a hollow-shell rhombic dodecahedron particle after pyrolysis. Doping extra S atom is found to be an effective method to increase the density of atomically dispersed active sites and boost their catalytic performance. The H-ZIF-Fe-SCN catalyst shows good bifunctional stability toward the oxygen reduction reaction and the oxygen evolution reaction in alkaline solution, the half-wave potential for the H-ZIF-Fe-SCN catalyst was recorded to be 0.889 V vs reverse hydrogen electrode, and a maximum power performance of 158.8 mW cm–2 was achieved when it was used as a cathode catalyst in zinc–air batteries.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Yu-Cai He,Dan-Ping Zhang,Zhi-Cheng Tao,Yun Lu,Yun Ding,Feng Liu,Zheng-Zhong Zhu,Huan Rui,Gao-Wei Zheng,Xian Zhang
To reduce dependence on the expensive cofactor and effectively biotransform ethyl 4-chloro-3-oxobutanoate, l -glutamine and glycine were found to enhance the content of intracellular NADH and the reductase activity. Adding the mixture of 200 mM of l -glutamine and 500 mM of glycine to the reaction media, a 1.67-fold of reductase activity was increased over the control without the addition of the two compounds. Moreover, β-cyclodextrin (0.4 mol β-cyclodextrin/mol ethyl 4-chloro-3-oxobutanoate) was also added into this reaction media, and the biocatalytic activity of the whole-cell biocatalyst of Escherichia coli CCZU-K14 was increased by 1.34-fold than that without β-cyclodextrin. In this β-cyclodextrin–water media containing l -glutamine (200 mM) plus glycine (500 mM), ethyl ( S )-4-chloro-3-hydroxybutanoate (>99% ee ) could be obtained from 3000 mM ethyl 4-chloro-3-oxobutanoate in the yield of 98.0% after 8 h. All the positive features demonstrate the potential applicability of the bioprocess for the large-scale production of ethyl ( S )-4-chloro-3-hydroxybutanoate.
研究领域:
生物化学
·
酶工程
·
有机合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Qi Chen,Ling Hu,Yingzhang Shi,Cheng Liu,Yidong Hou,Jinhong Bi,Jimmy C. Yu,Ling Wu
Heterogeneous photocatalytic degradation of antibiotic involves the activation of antibiotic molecules and the photocatalytic oxidation process. However, the simultaneous improvement of these processes is still a challenge. Herein, S-scheme heterojunctions consisted of Cu 2 O nanocluster with defective WO 3 nanosheets were constructed for efficient photocatalytic degradation of levofloxacin (LVX). The typical CNS-5 composite (5 wt% Cu 2 O/WO 3 ) achieves an optimal LVX degradation efficiency of 97.9% within 80 min. The spatial charge separation and enhancement of redox capacity were realized by the formation of S-scheme heterojunction between Cu 2 O and WO 3 . Moreover, their interfacial interaction would lead to the loss of lattice oxygen and the generation of W 5+ sites. It is witnessed that the C–N of piperazine ring and C O of carboxylic acid in LVX are coordinated with W 5+ sites to build the electronic bridge to activate LVX, greatly promoting the further degradation. This work highlights the important role of selective coordination activation cooperated with S-type heterojunctions for the photocatalytic degradation and offers a new view to understand the degradation of antibiotics at molecular level.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Bioresource Technology Reports
·
2018
·
IF 0
Bing-Qian Wang,Bo Peng,Jian-Fei Sun,Chu Wang,Ke Jiang,Jing-Hao Ma,Peng-Qi Zhang,Yu-Cai He
An effecti v e combination pretreatment of bamboo shoot shell (BSS) using Emulsifier OP-10 (0.5%, w/v) in the acidified media (pH 4.0) by autoclaving (120 °C, 40 min) was conducted. After BSS slurry without detoxification was enzymatically hydrolyzed for 96 h, glucose (25.2 g/L) and xylose (7.5 g/L) were obtained from 50 g/L BSS at high yields. HPLC results showed that no potential inhibitors (furfural and 5-hydroxymethylfurfural) formed. In the hydrolysates , an effective biocatalytic synthesis of ethyl ( S )-4-chloro-3-hydroxybutanoate (100% yield; >99% e.e. ) from 1000 mM ethyl 4-chloro-3-oxobutanoate was developed without the extra addition of cofactors within 24 h. In summary, this combination strategy involving biomass pretreatment, enzymatic saccharification , and bioreduction can be developed for producing chiral alcohols.
研究领域:
生物质预处理
·
酶解糖化
·
生物催化
·
手性醇合成
✓ 已验证
DOI
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yan Zhang,Yin-Qi Wu,Na Xu,Qian Zhao,Hui-Lei Yu,Jian-He Xu
Enzymatic asymmetric sulfoxidation using molecular oxygen as the oxidant is a promising green chemistry approach to chiral sulfoxide production. Despite the broad substrate spectrum of cyclohexanone monooxygenases (CHMOs), some unnatural substrates with bulky functional groups, such as the pharmaceutically relevant omeprazole sulfide, cannot be effectively accepted by CHMOs. Herein, we describe a set of variants derived from an Acinetobacter calcoaceticus CHMO (AcCHMO), whose active sites adjacent to the substrate tunnel were altered to shift the substrate specificity from cyclohexanone monooxygenation toward omeprazole sulfide sulfoxidation. We performed homologous modeling and molecular docking to identify key residues that might affect the substrate specificity. Two libraries of residues lining the active center of AcCHMO were then constructed and screened by an effective halo-based selection method using the solubility difference between the substrate (omeprazole sulfide) and product (esomeprazole). Functional evaluation of the resultant variants showed that the substrate specificity of AcCHMO was markedly altered from the small natural substrate (cyclohexanone) toward the desired bulky substrate (omeprazole sulfide) despite the extremely poor activity detected even for the best variant, M2 (0.61 U/gprot). The crystal structure of M2 complexed with a flavin adenine dinucleotide (FAD) prosthetic group was determined, which provided insight into the altered substrate specificity. To improve the activity of enzyme M2 toward pharmaceutical precursor omeprazole sulfide, we performed both local and global protein engineering among the two CASTing libraries surrounding FAD+ and NADP+ prosthetic groups and an error-prone PCR library of the full-length AcCHMO. As a result, variant M6 was obtained, giving a 50-fold higher activity compared to M2. This structure-guided protein engineering of AcCHMO provided a promising candidate for converting omeprazole sulfide into (S)-omeprazole using a green biocatalytic method.
研究领域:
生物催化
·
酶工程
·
药物化学
·
绿色化学
·
蛋白质结构与功能
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Liquan Yao,Limei Lin,Hui Liu,Fengying Wu,Jianmin Li,Shuiyuan Chen,Zhigao Huang,Guilin Chen
Antimony chalcogenide Sb 2 (S, Se) 3 is attracting a lot of attention as photovoltaic absorber owing to its rewarding photoelectric properties, low toxicity, and earth abundance. However, its device efficiency is still limited by the absorber material quality and device interface recombination. In this work, a fluorine-doped tin oxide (FTO) substrate with ultra-thin SnO 2 layer and a low-cost stabilized carbon paste are introduced as a front and back contact layer respectively in Sb 2 (S, Se) 3 based planar solar cells. Over 5.2 % efficiency is demonstrated in the structure of FTO/SnO 2 /CdS/Sb 2 (S, Se) 3 /Carbon/Ag, where the Sb 2 (S, Se) 3 is prepared by hydrothermal technique. The complementary device physics characterizations reveal that the interfacial recombination between TCO and CdS is significantly suppressed by the introduction of ultra-thin SnO 2 layer, which is profited from the leakage protection and bandgap offset engineering by its high resistivity and suitable conduction band minimum. Meanwhile, the successful adoption of the low-cost stabilized carbon as a back contact here shows an enormous potential to replace the conventional organic hole transport materials and noble metal. We hope this work can provide positive guidance to optimize Sb 2 (S, Se) 3 based planar solar cells in the future.
研究领域:
材料科学
·
光伏技术
·
可再生能源
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lanlan Guo,Wei Zhao,Linlin Dong,Xin Shi,Guodong Wang,Rui Li,Jianliang Cao,Xueli Yang,Xiaolian Liu,Yan Wang
The construction of high-performance sensitive materials is a basis for excellent sensors. Among prior SnS 2 -based sensors, high sensing performance often accompanies high operating temperatures or expensive costs, which limits their practical use. Herein, we employed Sr doping and NaBH 4 treatment strategies to increase the S-vacancies content in the SnS 2 microflowers. Particularly, this composite sensitive material shows large specific surface area, low crystallinity and rich S-vacancies content, which enables this sensor excellent sensing properties toward NO 2 , with a response of 4.7 toward 5 ppm NO 2 at 100 °C. In addition, this sensor has a low detection limit for NO 2 as low as 0.2 ppm, which is a lower value compared to many SnS 2 -based NO 2 sensors as reported. XRD, SEM, TEM, EPR and BET characterization combined with density functional theory (DFT) calculations are adopted to illustrate the enhancement mechanism toward NO 2 of the composite sensitive materials fabricated in this work. This study provides new ideas and scientific basis for the construction of metal sulfide based NO 2 sensors, which has important theoretical significance and application value.
研究领域:
材料科学
·
传感器技术
·
计算化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）