APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiang Li,Guigan Fang,Qingwen Tian,Ting Wu
The radicals generated by photocatalysis are widely used in environmental pollution treatment due to their super oxidizing ability and non-polluting characteristics, and are controlled through band potential and electron transfer types. Herein, through crystal engineering, we developed a novel g-C 3 N 4 /BiVO 4 containing BiVO 4 with different crystal structures, which can generate superoxide radicals and hydroxyl radicals under light irradiation. The (1 1 0) and (0 1 0) of BiVO 4 crystal face showed different electron transfer paths, which proves that the existence of the build-in electric field is the internal driving force of S-scheme electron transfer. S-scheme electron transfer can reduce the recombination of electrons and holes, and promote the photocurrent density, and type Ⅱ electron transfer can reduce the decomposition of active oxides. By adjusting the ratio of S-scheme and type Ⅱ electron transfer, the addition of 1 % g-C 3 N 4 could increase the photocatalytic activity of organic pollutants by 2.3 times. And the gap between the interfaces of g-C 3 N 4 and BiVO 4 also increases the adsorption capacity of pollutants. This research provides a theoretical basis for the regulation of the crystal structure and interface electron transfer in photocatalysis.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Jiang Cheng,Xuelian Yan,Qionghua Mo,Bitao Liu,Jun Wang,Xin Yang,Lu Li
A g-C 3 N 4 /BiVO 4 composite photocatalyst with enhanced photocatalytic activity and photoelectrochemical (PEC) performance was fabricated via a simple synthesis method with BiVO 4 nanofibers as starting material. The materials were characterized with different techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), N 2 absorption–desorption isotherm (BET) and photoluminescence spectroscopy (PL). The results showed that this synthesis method is effective to make a composite. The photocatalytic evaluation indicates that the photocatalytic activity of the g-C 3 N 4 /BiVO 4 photocatalyst for methylene blue (MB) was about 8 and 7 times higher than that of pure BiVO 4 and g-C 3 N 4 , respectively. This should be due to the enhanced light harvesting ability and to the effective electron transfer during the photocatalytic reaction.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Feihu Mu,Jin Huang,Shengpan Xu,Ruiqing Wang,Xiaozhong Chu,Zhipeng Cheng,Xujing Guo,Wei Zhao,Benlin Dai,Wenshuai Zhu
Dissolved organic matter (DOM) in black-odorous water can cause excessive growth of plants and algae, leading to deterioration of water quality. Herein, an S-scheme Au/g-C 3 N 4 /BiVO 4 heterojunction was constructed using a three-step method for DOM degradation in real black-odorous water in the presence of peroxymonosulfate (PMS). 4Au/g-C 3 N 4 /BiVO 4 /PMS exhibited highly efficient photocatalytic performance, and the DOM removal rate could reach 92.9 %, which was 19.1 and 9.9 times higher than that of g-C 3 N 4 /PMS and BiVO 4 /PMS, respectively. The changes of fluorescence components in DOM were detected using synchronous fluorescence spectra and two-dimensional correlated spectroscopy analysis, and the toxicity of catalytically treated black-odorous water was evaluated by growth inhibition of Escherichia coli . A reasonable S-scheme mechanism was suggested by theoretical calculations and photoelectrochemical tests. The S-scheme mechanism and the synergistic effect of photocatalysis and hybrid advanced oxidation process (HAOP) increased the catalytic activity of Au/g-C 3 N 4 /BiVO 4 /PMS.
研究领域:
环境科学
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光催化材料
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水处理技术
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2025
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IF 6.3
Zili Liang,Jianan Dai,Meiting Zhao,Jing Ma,Jiaxing Zhang,Tengyue Zhang,Rui Liu
Background Escalating global water pollution from intensified industrial and agricultural activities has highlighted the urgent need for sustainable wastewater treatment. Semiconductor photocatalysis is a promising solution, yet conventional type-II heterojunctions often suffer from sluggish charge separation and weak redox capacity, limiting their practical application. Methods To address these challenges, a series of Z-scheme g-C 3 N 4 /BiVO 4 (CN/BV) heterojunctions were rationally engineered via hydrothermal temperature modulation (100-180 °C), enabling precise control of crystallinity, morphology, and band alignment. Advanced characterizations (XRD, TEM, UV-vis DRS, and XPS) were combined with EPR analysis, DFT calculations, and XPS valence band studies to elucidate the structure–property–activity relationship. Furthermore, machine learning models were integrated with experimental data to predict norfloxacin (NOR) degradation performance under diverse operational conditions. Significant Findings The optimized CN/BV composite synthesized at 120°C exhibited outstanding photocatalytic activity, achieving 94.41 % degradation of norfloxacin (10 mg/L) within 120 min under visible light (λ > 420 nm), with an apparent rate constant ( k = 0.02618 min⁻¹), 4.83 times higher than BiVO 4 and 2.44 times higher than g-C 3 N 4 . EPR and radical trapping analyses identified •OH and •O₂⁻ as the dominant reactive species, while mechanistic evidence confirmed a direct Z-scheme charge transfer pathway enabling efficient carrier separation and strong redox capability. Integrating this rationally designed photocatalyst with machine-learning prediction ( R 2 = 0.8558, RMSE = 0.0510) establishes a data-driven framework for performance optimization. This study provides both a mechanistic insight and an intelligent design paradigm for next-generation photocatalysts targeting efficient degradation of emerging contaminants.
研究领域:
环境科学
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材料化学
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光催化
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环境污染治理
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计算化学
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人工智能在环境中的应用
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xufei Li,Ting Chen,Yanling Qiu,Zhiliang Zhu,Hua Zhang,Daqiang Yin
The coupling of photocatalysis and peroxymonosulfate (PMS) activation is considered as a promising strategy for the removal of organic pollutants. However, the development of visible-light-excited efficient photocatalysts for PMS activation remains challenging. Herein, a new recyclable dual Z-scheme g-C 3 N 4 /BiVO 4 /CuFe 2 O 4 (CN/BVO/CFO) heterojunction was first fabricated employing a simple hydrothermal approach. The results showed that the photocatalytic degradation behavior of levofloxacin (LEV) by CN/BVO/CFO under visible light illumination was enhanced compared with single BVO, CN, CFO and binary CN/BVO. Moreover, after adding PMS, the removal efficiency of LEV over CN/BVO/CFO/Vis/PMS system reached 96.2% within 60 min, which was 3.5 and 4.3 times higher than that of CN/BVO/CFO/Vis and CN/BVO/CFO/PMS, respectively. Characterization test and mechanism analysis indicated that the improved catalytic activity resulted from the dual Z-scheme heterostructure and the synergistic effect between photocatalysis and PMS activation, making the production of multiple active species. Additionally, CN/BVO/CFO/Vis/PMS system exhibited supreme mineralization ability, low degradation product toxicity and acceptable adaptability to solution pH, coexisting anions and organics. More importantly, the favorable magnetic separation and stability would provide convenience for the potential practical application of CN/BVO/CFO. This research may give a perspective on the design of efficient dual Z-scheme photocatalyst for PMS activation in environmental remediation.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Ganghua Zhou,Lirong Meng,Xin Ning,Weiqin Yin,Jianhua Hou,Qiao Xu,Jianjian Yi,Shengsen Wang,Xiaozhi Wang
Constructing type II heterojunction is an efficient strategy to enhance the light absorption and promote the charge transport. However, the improvement effect is limited by the decreased redox ability of charge carriers. The rational design of heterojunction from type II to Z-scheme is expected to overcome this obstacle. Herein, we demonstrate that the introduction of interfacial oxygen vacancies (OVs) can switch charge transfer of g-C 3 N 4 /BVO heterojunction from type II to Z-scheme. The interfacial OVs acted as the reactive center of charge carriers to quench the electrons of BVO and holes of g-C 3 N 4 , thereby promoting charge separation and migration. As a result, the interfacial OVs mediated Z-scheme g-C 3 N 4 /BVO heterojunction kept the strong oxidation/reduction potential of two single-component photocatalysts thereby significantly enhancing the photodegradation of tetracycline and CO 2 photoreduction. The kinetic constant of tetracycline degradation on the optimal g-C 3 N 4 /BVO-20 sample was 2.04-fold and 2.29-fold higher than those on g-C 3 N 4 nanosheets and pure BVO, respectively. This work provides a feasible strategy by the interfacial vacancy engineering of heterojunction for enhanced photocatalysis .
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
FOOD CHEMISTRY
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2022
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IF 9.231
Zhengzheng Zhao,Zhifang Wu,Xueling Lin,Fangjie Han,Zhishan Liang,Likun Huang,Mengjiao Dai,Dongxue Han,Lipeng Han,Li Niu
A simple low-cost label-free photoelectrochemical (PEC) biosensing platform based on red blood cell shaped BiVO 4 modified g-C 3 N 4 was designed for tetracycline detection under room temperature. The prepared g-C 3 N 4 /BiVO 4 heterojunction not only demonstrated a high surface area, excellent physicochemical stability and favorable PEC activity, but also can be employed as nanostructure support for aptamers to construct a visible-light-driven PEC aptasensor due to rich π-π accumulation sites. More importantly, the proposed PEC aptasensor showed a favorable linear toward tetracycline in the range from 5 × 10 -9 to 2 × 10 -7 M with a detection limit of 1.6 nM, which well covered the Food Standards Testing requirements. Practical food sample analysis further revealed the accuracy and feasibility of the g-C 3 N 4 /BiVO 4 heterostructure based PEC platform. It is expected that such a label-free and cost-effective PEC strategy should act as a promising candidate for tetracycline determination in food quality control and supervision.
研究领域:
分析化学
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食品科学
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光电化学
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生物传感器
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·667-676
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IF 2.195
Zhang Qi,Liu Miao,Liu Shujie,Qiao Liang,Hu Xiaoying,Tian Hongwei
BiVO 4 is known for its ability to decompose water under visible light irradiation. However, BiVO 4 overall suffers from rapid recombination of photogenerated carriers, low photochemical conversion efficiency, low specific surface area, poor conductivity, and weak adsorption capacity of dye. These features limited its application in photocatalysis. In this work, ternary Z-scheme g-C 3 N 4 /RGO/BiVO 4 nanocomposites were successfully fabricated by in situ electrostatic adsorption of g-C 3 N 4 sheets on RGO/BiVO 4 surface using hydrothermal and thermal oxidations processes. The ternary Z-scheme g-C 3 N 4 /RGO/BiVO 4 nanocomposites were then tested for photodegradation of Rhodamine B. The introduction of graphene into direct Z-scheme g-C 3 N 4 /BiVO 4 nanocomposites as an electronic accelerator efficiently enhanced the photocatalytic properties. The as-prepared g-C 3 N 4 /RGO/BiVO 4 composites exhibited optimal visible light responses with significantly improved photocatalytic performances toward degradation of Rhodamine B. The degradation efficiency using ternary photocatalyst reached 100% after 20 min of irradiation time. The reaction rate constant was estimated to 1.537, which was almost 29- and 20-folds higher than those of pure g-C 3 N 4 and binary g-C 3 N 4 /BiVO 4 , respectively. The synergistic effect between BiVO 4 , RGO and g-C 3 N 4 yielded g-C 3 N 4 /RGO/BiVO 4 composites with Z-scheme charge transfer mechanism, promoting rapid separation and slow recombination of photogenerated electron–hole pairs with strong photocatalytic activity. Overall, these findings look promising for design of future Z-scheme photocatalysts for environmental degradation of organic dyes.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Zhen Qin,Wenjian Fang,Junying Liu,Zhidong Wei,Zhi Jiang,Wenfeng Shangguan
A two-step photocatalytic water splitting system, termed a “Z-scheme system”, was achieved using Zn-doped g-C 3 N 4 for H 2 evolution and BiVO 4 for O 2 evolution with Fe 2+ /Fe 3+ as a shuttle redox mediator. H 2 and O 2 were evaluated simultaneously when the doping amount of zinc was 10%. Moreover, Zn-doped (10%) g-C 3 N 4 synthesized by an impregnation method showed superior active ability to form the Z-scheme with BiVO 4 than by in-situ synthesis. X-ray diffraction, UV-Vis spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the samples. It was determined that more Zn–N bonds could be formed on the surface of g-C 3 N 4 by impregnation, which could facilitate charge transfer.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2025
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IF 6.3
Yanhua Cui,Yixuan Hong,Weilong Shi,Zengkai Wang
Background Photocatalytic membrane technology has attracted widespread concern in the field of water purification due to its high-efficiency and eco-friendly. However, the active sites of photocatalyst are easily embedding in the polymer membrane, consequently reducing degradation efficiency of photocatalytic membrane. Methods In this study, two-dimensional/two-dimensional regenerated silk fibroin-carbonized carbon modified graphite carbon nitride/bismuth vanadate heterojunction (2D/2D C-g-C 3 N 4 /BiVO 4 ) with excellent photocatalytic performance was synthesized by electrostatic self-assembly method. Then C-g-C 3 N 4 /BiVO 4 heterojunction was selected as catalytic structural units, three-dimensional (3D) interfacial networked poly(vinylidene fluoride) membrane-supported C-g-C 3 N 4 /BiVO 4 heterojunction (C-g-C 3 N 4 /BiVO 4 /PVDF) was fabricated by electrospinning technique. The combination of C-g-C 3 N 4 /BiVO 4 heterojunction and interfacial networked PVDF membrane synergistically enhanced their permeability, antifouling and antibacterial performance. Significant findings The optimized C-g-C 3 N 4 /BiVO 4 /PVDF photocatalytic membrane had higher degradation TC efficiency (83.33 %) than other membrane samples, and the efficiency of bacterial inactivation of C-g-C 3 N 4 /BiVO 4 /PVDF could reach 99.00 %. The C-g-C 3 N 4 /BiVO 4 /PVDF exhibited tremendous enhancement in the permeability (13,488.2 L m −2 h −1 ) and flux recovery efficiency (94.44 %). The free radical trapping tests and ESR spectra indicated that superoxide radical (·O 2 ⁻ ) was the dominant active species. In addition, the as-prepared C-g-C 3 N 4 /BiVO 4 /PVDF could easily recover and reuse, and photocatalytic activity basically remain unchanged, highlighting the potential application of membrane photocatalyst for the practical wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
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