iScience
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2025
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IF 4.1
Chen Chen,Siyu Zhao,Bingming Zhou,Changqing Ye,Baojiang Jiang,Liping Zhang
Mass transport is a fundamental yet often overlooked factor in influencing adsorption and photocatalytic reaction kinetics. This study examines the role of mass transport using the model system of monoclinic bismuth vanadate (BiVO 4 ) films and potassium dichromate (K 2 Cr 2 O 7 ) in a representative photocatalytic reaction. We show that diffusion-driven delivery of K 2 Cr 2 O 7 to the BiVO 4 surface increases adsorption capacity but decreases the adsorption rate constant. Notably, during the model photocatalytic reduction, long-range electric fields were observed around the illuminated BiVO 4 films, a phenomenon also confirmed in a separate reaction system using TiO 2 as the photocatalyst. These electric fields, distinct from the localized fields formed within heterojunctions, enhance dichromate transport by more than three orders of magnitude. This enhanced transport ensures a continuous supply of reactant to the photocatalyst, significantly improving reaction efficiency without additional energy input. These findings introduce a new strategy for optimizing photocatalytic processes, offering broad insights for advancing sustainable chemical engineering applications.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 6
·1-6
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IF 1.455
Wu Xiang-feng,Li Hui,Sun Yang,Wang Yi-jin,Zhang Chen-xu,Gong Xiao-dong,Wang Yu-duan,Liu Yu,Yang Xin-yue
In 2.77 S 4 nanosheets with the band gap energy of 1.75 eV were fast prepared via a hydrothermal process. The structure, morphology and optical properties of the as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy and UV–vis diffuse reflectance spectroscopy, respectively. Rhodamine B, methyl orange and potassium dichromate solution were used to evaluate the degradation efficiency of the as-prepared samples under the visible light, respectively. Experimental results showed that the molar ratio of thioacetamide to indium nitrate hydrate significantly influenced the structure and properties of the as-prepared products. With increasing the molar ratio, the degradation efficiency of rhodamine B solution was firstly increased and then decreased. When the molar ratio was 4:1, the degradation efficiency of the as-prepared sample reached to 96% in 3 min and 100% in 9 min. Moreover, this semiconductor could degrade 88% of methyl orange solution in 30 min and 87% of potassium dichromate solution in 60 min, respectively.
研究领域:
材料科学
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纳米技术
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环境科学
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光化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Kang Li,Yue Gao,Zhongxin Dong,Huibo Zhang,Xudong Fan,Lei Xu,Jie Huang,Feng Teng,Haibo Fan,Jiaming Song,Chunmei Zhang,Xuexia He,Peng Hu
Photocatalytic degradation is an effective technology for degrading water pollution that plays a significant role in environmental remediation. Ternary 2D ternary V-VI-VIIA semiconductors are ideal candidates for photocatalytic degradation of pollutants due to effective light absorption and high charge carrier mobility. In this work, high-quality SbSeI crystals were prepared using the chemical vapor transport (CVT) method and their photocatalytic degradation performance for multiple pollutants was studied. SbSeI exhibits excellent photocatalytic performance in the degradation of potassium dichromate (Cr (VI)), rhodamine B (RhB), tetracycline hydrochloride (TC-HCl) and methyl orange (MO). More than 98% of Cr (VI) and RhB can be removed after irradiation with an Xe lamp for 10 min and 40 min, respectively. The capture experiments and electron spin resonance results indicated that · O 2 − plays a major role in reducing Cr (VI), while h + plays a primary role in the degradation of MO, RhB and TC-HCl. Interestingly, the degradation rate of Cr (VI) is 1.3 times higher than that of a single pollutant system, and the degradation rate of RhB is 1.6 times higher, due to the enhanced separation and utilization of holes and electrons. The results demonstrate that SbSeI is a potential photocatalytic degradation material.
研究领域:
环境科学
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材料科学
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化学
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DOI
PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2020
·Vol. 35
·期 4
·719-725
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IF 0.64
Zhang Chenxu,Wu Xiangfeng,Jia Yunning,Chang Tianlong,Liu Zhifeng,Fu Yunxuan,Liu Xutao,Wang Hui,Shi Yimai,Zuo Yuqian
The SnO 2 quantum dots (SnO 2 QDs)/ZnS nanosheets (ZnSNs) heterojunction was fabricated via an in-situ synthetic method at room temperature. Rhodamine B, potassium dichromate, and tetracycline were used to discuss the photocatalytic activities of the as-prepared samples under the visible light illumination. The photocatalytic mechanism of the as-prepared samples was also proposed. The experimental results indicate that the degradation efficiency of the as-prepared SnO 2 QDs/ZnSNs heterojunction first increases and then decreases with increasing the usage of ZnSNs. When the mass ratio of SnO 2 QDs to ZnSNs is 1: 2 in 180 min, the asprepared samples have the highest degradation efficiency of 89.1% for rhodamine B, 97.7% for potassium dichromate, and 83.8% for tetracycline, which are much higher than 51.7%, 26.8%, and 0.9% of pure SnO 2 QDs as well as 37.9%, 87.1%, and 19.1% of pure ZnSNs, respectively. After it is repeatedly degraded for 3 times, it possesses the degradation efficiency of 62.5% for rhodamine B, which increases by 200.5% in comparison with 20.8% of the pure SnO 2 QDs. Moreover, the enhanced photocatalytic performances of the as-prepared hybrids are attributed to the formation of heterojunction between the SnO 2 QDs and ZnSNs. In addition, hydroxyl radicals and superoxide anion radicals play major roles during the photocatalytic degradation process, while holes play a minor role.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Huiyong Li,Zemin Zheng,Mofan Liu,Hao Jiang,Dafeng Hu,Xudong Zhang,Lei Xia,Xuemin Geng,Jiangwei Lu,Xinran Cheng,Yanfen Wan,Peng Yang
A novel Pd nano-skeleton (Pd NSs) modified Bi 2 MoO 6 balls photocatalyst was prepared by a facile hydrothermal treatment. The characterization by multiple techniques demonstrated the excellent light absorption and effective photo-generated electron-hole pairs separation performance of the composite catalyst, which further proved its superior photocatalytic property. Compared to the pure Bi 2 MoO 6 nanosheets, carbon quantum dots (CQDs) modified Bi 2 MoO 6 balls and Pd nanoparticles (Pd NPs) modified Bi 2 MoO 6 balls catalysts, 1.3% Pd NSs@Bi 2 MoO 6 sample exhibited the optimal catalytic performance for removing methyl orange (MO), methylene blue (MB), K 2 Cr 2 O 7 , phenol and the simulated wastewater mixture formed by the first three above under the illumination of visible light. Above all, the degradation efficiency increased about 5 times that of the pure Bi 2 MoO 6 balls for the degradation of MO. This great improvement was mainly attributed to Pd NSs with many contact edges, which provided more active sites for the adsorption reaction of organic dye molecules, following its better near-infrared light absorption capacity in the catalytic system. The active species mainly involved in the reaction were verified by ESR technique and the trapping test, mainly involving O 2 − , holes, OH, etc., and a possible photocatalytic reaction mechanism and pollutant degradation pathway were also proposed.
研究领域:
环境科学
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化学
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材料科学
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水处理
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DOI
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2019
·Vol. 42
·期 10
·1573-1582
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IF 2.371
Zhou Hai-Yan,Li Yi-Zuo,Jiang Rui,Hu Hai-Feng,Wang Yuan-Shan,Liu Zhi-Qiang,Xue Ya-Ping,Zheng Yu-Guo
R -2-(4-hydroxyphenoxy)propionic acid ( R -HPPA) is a key intermediate of the enantiomerically pure phenoxypropionic acid herbicides. R -HPPA could be biosynthesized through selective introduction of a hydroxyl group (–OH) into the substrate R -2-phenoxypropionic acid ( R -PPA) at C-4 position, facilitated by microorganisms with hydroxylases. In this study, an efficient high-throughput screening method for improved R -HPPA biosynthesis through microbial hydroxylation was developed. As a hydroxylated aromatic product, R -HPPA could be oxidized by oxidant potassium dichromate to form brown-colored quinone-type compound. The concentration of R -HPPA can be quantified according to the absorbance of the colored compound at a suitable wavelength of 570 nm; and the R -HPPA biosynthetic capability of microorganism strains could also be rapidly evaluated. After optimization of the assay conditions, the high-throughput screening method was successfully used in identification of Beauveria bassiana mutants with enhanced R -HPPA biosynthesis capacity. A positive mutant C-7 with high tolerance to 20 g/L R -PPA was rapidly selected from 1920 mutants. The biomass and R -HPPA titer were 12.5- and 38.19-fold higher compared with the original strain at 20 g/L R -PPA. This high-throughput screening method developed in this work could also be a potential tool for screening strains producing other important phenolic compounds.
研究领域:
生物技术
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微生物学
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化学工程
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药学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）