LANGMUIR
·
2025
·
IF 3.9
Guang Lu,Lunqiu Zhang,Jiling Liang,Wei Li,Zheng Li,Xuejun Zou,Xiaodong Zhang
Herein, first, MIL-125 samples were synthesized via a hydrothermal method. Then, Ag species were doping on the surface of MIL-125 samples via the photolysis of silver nitrate. Finally, the Z-scheme MIL-125/Ag/BiOBr composite was synthesized via a directed liquid assembly method. The structure, morphology, and optical properties of the prepared samples were investigated via X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopic mapping, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption analysis, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, surface photovoltage analysis, transient photocurrent response analysis, electrochemical impedance spectroscopy, and electron spin resonance analysis. Photocatalytic experiments indicated that the photocatalytic Cr6+ reduction efficiency of MIL-125/Ag/BiOBr heterojunctions was 85.7% at pH = 6, which was approximately 5.5 and 2.2 times higher than that using BiOBr and MIL-125 alone, respectively. This performance was attributed to the intimate interfacial contact between MIL-125 and BiOBr and the doping of Ag species, which increased the transfer and separation of photogenerated carriers and inhibited the recombination of electrons and holes. Furthermore, the possible photocatalytic Cr6+ reduction mechanism of the Z-scheme MIL-125/Ag/BiOBr photocatalyst was proposed.
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
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Chun Sun,Yelin Ding,Yiwei Zhao,Zhihui Deng,Kai Lian,Zhengtong Wang,Jiazhi Cui,Ruifeng Wang,Jiabao Bai
BiOBr has garnered significant attention for photocatalysis owing to its distinctive layered structure. Nevertheless, it is full of challenges to synthesize high-quality BiOBr nanosheets by a simple room-temperature strategy due to the rapid chemical reaction between (Bi 2 O 2 ) 2+ cations and Br - anions. Herein, a Cs 3 Bi 2 Br 9 conversion strategy is proposed to fabricate BiOBr nanosheets with highly exposed (001) facets. BiOBr nanoclusters can grow on the surface of Cs 3 Bi 2 Br 9 during the hydrolysis process, which can prevent further corrosion of Cs 3 Bi 2 Br 9 , resulting in a sluggish BiOBr formation rate. During the conversion process, atom rearrangement occurs, leading to the creation of abundant oxygen vacancies. Furthermore, through precise adjustment of the amount of Cs, we can finely modulate the width and thickness of BiOBr nanosheets. As a result, the optimal sample achieves complete photodegradation of rhodamine B under 12.5 min of light irradiation. Utilizing this facile and convenient preparation method, an ohmic heterojunction comprising MXene and BiOBr has been synthesized, effectively promoting the separation of photogenerated carriers. Excitingly, the fabricated BiOBr/MXene exhibits higher photocatalytic efficiency than the single BiOBr, which can degrade rhodamine B within 7.5 min.
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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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yihao Zhao,Bingzhu Wang,Qimin Fang,Songyang Wu,Yuan Ma,Changxiang Xie,Haiwang Wang
To achieve efficient photocatalytic degradation of multi-component wastewater, the solvothermal method was employed to synthesize g-C 3 N 4 /BiOBr, leading to a homogeneous encapsulation of lamellar g-C 3 N 4 around the flower-like spherical BiOBr structure. In this work, the control of the temperature and the composition ratio during the solvothermal process was used to achieve the modulation of the g-C 3 N 4 /BiOBr microscopic morphology and enhance the photocatalytic activity, and the mechanism of the evolution of its microstructure and photocatalytic activity was elucidated. Moreover, the electron transport bridge between heterojunctions was constructed by introducing metal Pd, which further reduced the probability of photogenerated electron-hole complexation, leading to a higher photocatalytic performance. The elimination rates of RhB, Cr(VI), and TCH of g-C 3 N 4 /Pd/BiOBr under the irradiation of visible light were 99.74 %, 89.20 %, and 44.62 %, respectively, which achieved efficient elimination of a wide range of pollutants. Besides, the carrier transport mechanism in g-C 3 N 4 /Pd/BiOBr heterojunction was proven to Z scheme, which mainly induced the complexation of e - in the conduction band of BiOBr and h + in the valence band of g-C 3 N 4 , which provided higher energy for oxidation and reductive degradation. This work provides an important reference for the research focusing on photocatalyst design and sewage treatment.
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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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 13
·3380-3387
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IF 5.726
Xiaochao Zhang,Jiabing Wei,Guangmin Ren,Changming Zhang,Zhanfeng Zheng,Caimei Fan
This work reported for the first time a systematic investigation on a BiOBr photocatalyzed oleic acid isomerization process in different (air, N2 and O2) atmospheres and proposed the cis–trans isomerization mechanism to effectively restrain the formation of trans fatty acids with deleterious effects on human health. The phase structures, optical properties, and morphologies of as-prepared BiOBr were characterized by XRD, UV-vis DRS, SEM and TEM. Besides, the photocatalyzed isomerization products over BiOBr in different atmospheres were analyzed with FT-IR and 1H NMR for comparison. The results demonstrate that there are significant differences in the photocatalytic isomerization process of oleic acid in different atmospheres, and especially the N2 atmosphere is the most favorable atmosphere, while the presence of O2 will inhibit the formation of elaidic acid. Moreover, density functional theory (DFT) was employed to calculate the charge density and energy difference of ground states between cis- and trans-isomers of oleic acid. Combining the theoretical and experimental findings, the radical cation and photo-induced h+ action mechanisms in the photocatalytic isomerization process were discussed and proposed. Our findings should provide new insights and basic data for understanding the photocatalytic isomerization of unsaturated fatty acids.
研究领域:
食品科学
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化学工程
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生物化学
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产品关联
DOI
高影响因子
SOLAR ENERGY
·
2025
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IF 6.6
Jiayuan Geng,Yipei Cao,Hongquan Fu,Jinming Chang,Hejun Gao,Fang Liao,Juan Zhang,Yunwen Liao
Photocatalytic nitrogen fixation, converting atmospheric nitrogen into ammonia under ambient conditions, offers a sustainable alternative to the Haber-Bosch process. Herein, the hydrothermal and solvothermal methods to prepare the heterojunction based on BiOCOOH nanosheets and BiOBr nanosheets (BiOCOOH/BiOBr) have been reported. The BiOBr nanosheets epitaxially grow along the nanosheets structure of BiOCOOH. The BiOCOOH/BiOBr heterojunction exhibit photogenerated electron–hole separation properties, which was ascribed from the suitable bandgap values for photocatalytic nitrogen fixation. The NH 3 yield of BiOCOOH/BiOBr heterojunction (63.7 μmol·g −1 ·h −1 ) was about 9 times higher than that of pure BiOCOOH with addition of 0.75 mL of methanol as a sacrifice solvent. Moreover, it is confirmed that the texture coefficient of the (102) BiOBr facet between BiOCOOH and BiOBr is positively correlated with photocatalytic performance, which verifies the growth law of BiOBr on BiOCOOH and explains the formation of the heterojunction from a new perspective. The oxygen vacancies from the (102) BiOBr facet can facilitate the adsorption of nitrogen molecules with a stable adsorption energy of 0.1 eV by density functional theory calculations. This study may offer new perspectives for the design of a series of photocatalytic nitrogen fixation catalysts, particularly in terms of crystal facet control and oxygen vacancy-enhanced nitrogen adsorption.
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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纳米技术
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物理化学
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产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 15
·8843-8858
·
IF 4.21
Jiang Mengting,Zhang Yakang,Chen Jingwen,Liang Qian,Xu Song,Yao Chao,Zhou Man,Li Zhongyu
A series of morphology-controlled BiOBr nano/macrostructures was successfully synthesized via a novel biomass-route derived from bacterial cellulose (BC). In the BiOBr/BC system compared with pure BiOBr, the three-dimensional BC scaffolds not only effectively prevented the aggregation of BiOBr units by pore confinement, but also strengthened the controllability of BiOBr size with the help of abundant anchoring sites provided by cross-linked BC fibers. By associating the results of characterizations and the photodegradation of RhB dye, the relationship between morphology and photocatalytic activity of BiOBr/BC was investigated. In addition, a possible mechanism for the enhanced photocatalytic activity of the optimized BiOBr/BC has been discussed. This biomass-derived route provides a platform for further design of bismuth-based composite photocatalysts with potential advantages of being anti-aggregation, highly-dispersed, easily recovered and having enhanced catalytic performance.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Yidan Luo,Puxin Xu,Chao Liu,Huiyin Ye,Ke Peng,Shuohan Yu,Mingshan Xue,Yu Xie,Luhui Wang
Constructing heterostructures is an effective method for enhancing photocatalytic efficiency. Herein, a two-dimensional (2D)/2D heterojunction of NiAl-LDH/BiOBr with a built-in electric field (BIEF) was firstly synthesized. The photocatalytic efficiency of CO 2 reduction was assessed under visible light. And the findings revealed that the composite with 10 wt% NiAl-LDH demonstrated the highest CO 2 photoreduction performance, yielding a rate of 10.7 μmol·g −1 ·h −1 for CO generation, which was 21.4 and 4.3 times higher than that of pure NiAl-LDH and BiOBr. The heterojunction of the sample was type-II heterojunction with the analysis of XPS, band structures, and in-situ XPS. Photoluminescence (PL) and electrochemical tests demonstrated that the type-II heterojunction between NiAl-LDH and BiOBr efficiently enhanced the separation and transfer of electrons and holes, consequently boosting the photocatalytic performance. Besides, in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS) was employed to reveal the reaction intermediates of CO 2 . This work provides experimental approaches and theoretical development of nanocomposite for photoreduction of CO 2 .
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Mei Cai,Bin Du,Anze Shui,Chao He
The photodegradation of pollutants is a significant and friendly technology to protect the environment. The fabrication of hierarchical heterojunction is the efficient method to improve the photocatalytic performance. Herein, the hierarchical type-II BiOBr@ZnIn 2 S 4 heterojunction is fabricated successfully via a simple chemistry method. The optimal sample BS170 (the volume of 170 mL ethylene glycol) exhibits the higher photodegradation under the visible light and presents 2.3 times higher than that of pure BiOBr for degradation of MO and the mass of BS170 is the half of BiOBr could achieve the same photocatalytic effect as BiOBr for the photodegradation of RhB. The results indicate the fabric of heterojunction could enhance the absorption capacity of visible light and separation efficiency of photoinduced electron-hole pairs to increase the photodegradation. Therefore, this work provides the novel strategy for fabricating the hierarchical type-II heterojunction photocatalyst for the degradation of dyes.
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
CHEMOSPHERE
·
2022
·
IF 8.943
Congjie Liang,Jian Ma,Yixi Cao,Taisong Zhang,Chanyu Yang,Yingfeng Wu,Huaming Li,Hui Xu,Yingjie Hua,Chongtai Wang
Adsorption and its influence are often neglected during photocatalytic degradation of organic pollutants . To call attention to these issues, a novel bismuth oxybromide (BiOBr) microsphere with hierarchical flower-like structure was fabricated through a facile hydrothermal process using polyvinyl pyrrolidone (PVP) as additive in this work, and then the adsorption of the BiOBr microspheres to RhB and its influence on the photocatalytic degradation of RhB were investigated in detail. Experimental results show that the BiOBr microspheres have a very strong adsorption capacity to RhB. The adsorption behavior follows the Langmuir model and the quasi second order kinetic equation . Tests of the photocatalytic degradation of RhB under visible irradiation verify that the adsorption of the BiOBr microspheres to RhB greatly boosts the degradation of RhB due to the “enriching effect”, and a complete degradation of 20 mg L −1 RhB only requires 37 min.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Solar RRL
·
2024
·
IF 6
Xiya Zhao,Zhiyu Li,Xiaochao Zhang,Xiushuai Guan,Changming Zhang,Puqian Tian,Huiqiang Yue,Liyuan Wang,Yadong Bai,Yawen Wang,Song Yang,Caimei Fan
Photo-anode-driven photoelectrocatalytic reduction of CO 2 is an ideal way for solving problems such as the greenhouse effect and environmental crisis. In this study, a one-step hydrothermal method was successfully used for the preparation of BiVO 4 films doped with different mass fractions of Mo. The results show that when Mo was doped at 1.5 wt%, photocurrent densities of up to 4.11 mA·cm -2 were obtained, 3.36 times greater than those of undoped BiVO 4 , and there was a marked cathodic shifting of water oxidation reaction initiation potential. Subsequently, coupling it with the BiOBr nanosheet cathode, the generated CH 3 OH rate reached 45.67 μmol·L -1 ·h -1 ·cm -2 at a low applied voltage of 1.2 V RHE , with a Faraday efficiency of 60.68% for photoelectrocatalytic CO 2 reduction. This work is important for Bi-based thin film self-assembly coupled with photoelectrocatalytic CO 2 systems. This article is protected by copyright. All rights reserved.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 29
·18381-18392
·
IF 10.7
Xuemeng Tian,Pengcheng Wang,Yue Wang,Xiaoyu Shi,Long Zhang,Jinfeng Liu,Yangyang Wang,Ruixia Gao
In this work, molecularly imprinted BiOBr@porphyrin composites (BiOBr@TAPP-MIP) were prepared by directly introducing imprinted cavities within the porphyrin-based framework, achieving in situ imprinted cavities for both the selective adsorption and efficient degradation of trace norfloxacin in water. The SEM, XPS, and XRD characterization results revealed the successful synthesis of a porphyrin-based imprinting layer on the surface of BiOBr. The optical characterization confirmed a substantial improvement in visible-light absorption and separation of photogenerated electron–hole pairs for BiOBr@TAPP-MIP compared to pure BiOBr. Accordingly, the adsorption and photodegradation experiments indicated that the in situ imprinted BiOBr@TAPP-MIP had larger adsorption capacity (181.1 mg g−1) and enhanced photodegradation performance for norfloxacin when compared to the non-imprinted BiOBr@TAPP-NIP. Compared with competitive pollutants, the selectivity coefficients for norfloxacin reached 1.77 for adsorption and 1.08 for degradation. Moreover, BiOBr@TAPP-MIP maintained high stability and excellent photodegradation performance in a variety of complex water environments. The in situ imprinted method proposed here has the potential to serve as a facile and universal approach for efficiently dealing with a broader range of trace pollutants.
研究领域:
环境科学
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材料科学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Kun Xu,Rui Xu,Xuejing Liu,Qin Wei
A handily self-powered photoelectrochemical (PEC) sensor is established for acetamiprid (ACE) analysis supported by Cu 3 Mo 2 O 9 /Ag 2 S photoanode and Cs 3 Bi 2 Br 9 /BiOBr photocathode. The band gap structure of Cu 3 Mo 2 O 9 and Ag 2 S is matched which enhanced the electron transfer rate. Photocathode composite is synthesized at the interface of water and oil, and the resulting composite has good stability to water and light. Electrons flowing from the photoanode through the external circuit to the photocathode can combine with photogenerated holes of Cs 3 Bi 2 Br 9 /BiOBr, causing the photoelectrons pass into the solution and react with oxygen, and producing a large photocathode current. With the increase of ACE concentration, the detected photocurrent gradually decreased due to the steric hindrance, and a linear relationship between photocurrent and ACE concentration in the range of 0.001–500 nM. This excellent PEC sensor also performed the great detection stability, selectivity and reproducibility, which can also be applied in practical application for pesticides analysis.
研究领域:
分析化学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）