APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Qing Sun,Meilin Ke,Yingjie Zhao,Bin Wang,Jian Zhang,Jiawei Sheng
Improving the ability of photocatalysts to capture and degrade dye pollutants is essential for the development of photocatalytic technology. Herein, a Bi 2 MoO 6 belt-like morphology with significantly enhanced visible light photocatalytic performance was obtained by solvent hydrothermal combining ethanol heat treatment technique. The Raman, FTIR, TEM, ESR, EIS and PL results demonstrate that the formation of defects on the {0 0 1} facet of BMO can effectively promote charge separation and prolong the life of optical carriers. The photocatalytic performance is evaluated by monitoring different concentrations RhB removal from aqueous solution and the results showed that defective Bi 2 MoO 6 nanobelts displayed 39 times and 60 times degradation rate than that of comparative conventional Bi 2 MoO 6 nanosheets and P25, respectively. In combination of controllable preparation process, excellent adsorption capacity and highly enhanced photocatalytic performance, this newly defective Bi 2 MoO 6 nanobelt might be a promising candidate for degradation of organic dyes in wastewater.
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
Journal of Materials Chemistry A
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2018
·Vol. 6
·期 45
·22580-22589
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IF 9.931
Xiu-Qing Qiao,Zhen-Wei Zhang,Qiu-Hao Li,Dongfang Hou,Qichun Zhang,Jian Zhang,Dong-Sheng Li,Pingyun Feng,Xianhui Bu
Exploiting novel photocatalysts with high efficiency and durability for reduction of hexavalent chromium (Cr(VI)) has gained attention from fundamental science and industrial research. In this work, we synthesized novel two-dimensional (2D) n–n Bi2MoO6 & Bi2S3 heterojunctions by a facile in situ anion exchange process for remarkably efficient removal of Cr(VI). Results show that Bi2MoO6 & Bi2S3 heterojunctions with core–shell structures are formed through the intimate contact of Bi2MoO6 core and Bi2S3 shell. The prepared Bi2MoO6 & Bi2S3 heterojunctions exhibit unprecedented photocatalytic activity for reduction of Cr(VI) under visible light irradiation. The optimized BMO-S1 heterojunction displays the highest reduction efficiency (κapp = 0.164 min−1) for Cr(VI) reduction. To the best of our knowledge, it is one of the highest reduction rate achieved among reported photocatalysts for Cr(VI) reduction under visible-light irradiation. Detailed studies show that strong selective adsorption for Cr(VI) enhances this unprecedented photocatalytic activity. Moreover, the intimate heterojunction between Bi2MoO6 core and Bi2S3 shell can efficiently deteriorate the charge carrier recombination and Bi2S3 content can boost visible light harvesting, thereby contributing to the remarkable photocatalytic catalytic activity, which were proven by PL, EIS and transient photocurrent responses. Characterization of Mott–Schottky plots and DRS prove that the Bi2MoO6 & Bi2S3 heterojunctions established a type-II band alignment with intimate contact, accounting for the efficient transfer and separation of photogenerated carriers. This work provides a simple route for facial synthesis of heterojunction photocatalysts for Cr(VI) reduction in industrial applications.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Ruyao Chen,Xincheng Dou,Jiazeng Xia,Yigang Chen,Haifeng Shi
In peroxymonosulfate (PMS) activation processes, sluggish kinetics of Cu 2+ /Cu + redox rate has been the weakness of photocatalytic conversion efficiency. In this work, Bi 2 MoO 6 /CuWO 4 photocatalysts were synthesized via a facile hydrothermal method, which significantly boosted the Cu 2+ /Cu + cycle and promoted PMS activation for the removal of tetracycline (TC) under visible light irradiation. Bi 2 MoO 6 /CuWO 4 with the mass ratio of 4:1 displayed significantly enhanced photocatalytic activity toward TC degradation with the assistance of a low concentration of PMS, which was 1.95 and 2.24 times as those of CuWO 4 and Bi 2 MoO 6 , respectively. The influence of initial pH values, PMS dosage and different inorganic anions during the photodegradation process was systematically investigated and demonstrated that Bi 2 MoO 6 /CuWO 4 could perform photocatalytic reactions in the wide pH range of 2.0–10.0. Also, Bi 2 MoO 6 /CuWO 4 showed excellent reusability and stability in the cycling experiments. Additionally, the possible degradation pathways in the PMS system were proposed according to the determination of generated intermediates during the degradation process. According to the band structures together with active species trapping experiments, a possible type-Ⅱ photocatalytic charge transfer mechanism of Bi 2 MoO 6 /CuWO 4 was reasonably proposed. XPS analysis of the fresh and used samples indicated that constructing type-Ⅱ heterojunction significantly boosted the Cu 2+ /Cu + cycle and promoted PMS activation, thereby accelerating the TC degradation. In conclusion, this work could shed more light on promoting PMS activation for the practical removal of organic pollutants in wastewater.
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
DALTON TRANSACTIONS
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2018
·Vol. 47
·期 30
·10046-10056
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IF 4.099
Xiang Li,Mengyuan Su,Guifen Zhu,Kaige Zhang,Xia Zhang,Jing Fan
In this study, a novel few-layer WS2/Bi2MoO6 heterojunction with greatly enhanced visible light photocatalytic performance was synthesized via a facile hydrothermal method. The results indicated that Bi2MoO6 nanosheets were directly grown on the surface of few-layer WS2 and form plate-on-plate heterojunctions. The synthesized nanocomposites exhibited excellent photocatalytic activity under visible-light irradiation. The optimal composite with 5 wt% WS2 showed the highest photocatalytic activity, whose degradation efficiencies and TOC removal were 99.5% and 91.7% for rhodamine B (RhB), 98.9% and 89.8% for ciprofloxacin (CIP), 76.0% and 67.8% for methylene blue (MB), and 69.3% and 58.6% for methimazole (MMI), respectively. Their excellent photocatalytic performance was predominantly ascribed to the construction of a plate-on-plate heterojunction structure between WS2 and Bi2MoO6, which could promote charge separation efficiency and enhance light harvesting efficiency. The present work provides a new understanding for extending the application of transition-metal dichalcogenides in the field of photocatalysis.
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
Catalysis Science & Technology
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2021
·Vol. 11
·期 14
·4783-4792
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IF 6.119
Yi Zhang,Shuo Gu,Xiaoyu Zhou,Kaiyue Gao,Kai Sun,Di Wu,Jingjing Xia,Xiufang Wang
Photocatalytic nitrogen fixation performance is mainly hampered by slow carrier transport and inefficient surface reaction, where surface oxygen vacancies have been proved to alleviate these limitations. However, there are a few reports on the introduction of metal vacancies into photocatalysts and the effect of metal vacancies on the N2 photofixing properties. Herein, we injected bismuth vacancies (VBi) into the surface of BiOBr nanospheres with oxygen vacancies (VO) via an ion exchange strategy to form hierarchical Bi2MoO6/BiOBr composite structures. The intentionally introduced VBi adjust the band structures of VO–BiOBr and act as charge separation centers in coordination with VO, which improves the separation efficiency of electron–hole pairs. The presence of VBi and the Bi2MoO6 phase enhances the light absorption of the composite materials. Additionally, the hierarchical nanosheet assembly structure facilitates the surface adsorption and activation of N2 on the catalyst. In particular, the optimal defect-rich Bi2MoO6/VBi+O–BiOBr exhibits the best photocatalytic ammonia production activity. After two hours, the NH3 yield was 412.18 mol L−1 without any noble metal cocatalyst and sacrificial agent, and was nearly 4 times higher than that of the original VO–BiOBr (96.08 mol L−1). This work provides a new inspiration for the design of efficient N2 immobilizing photocatalysts through synergistic metal and oxygen vacancy engineering.
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
Catalysts
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2023
·Vol. 13
·期 3
·457
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IF 3.9
Tasie Ebenezer Onyedika,Mengying Xu,Yichao Deng,Yang Liu,Lian Li,Pier-Luc Tremblay,Tian Zhang
Adsorption is a low-energy, economical, and efficient method for pollutant removal from water. Because of their unique structure, large specific surface area (SSA), and non-toxicity, bismuth-based semiconductors, usually researched for the photodegradation of organic molecules, are also excellent for dark adsorption processes. Here, a three-dimensional adsorbent with a heterostructure with a hydrangea-like shape made of Bi2MoO6(BMO) and BiOI (BOI) was synthesized by a one-pot solvothermal process and investigated for the adsorption of toxic dyes. BOI/BMO with an I-to-Mo ratio of 2.0 adsorbed 98.9% of the model pollutant rhodamine B (RhB) within 5 min with a maximum adsorption capacity of 72.72 mg/g in the dark at room temperature. When compared to pure BMO, the BOI2/BMO heterostructure was 14.1 times more performant because of its flower-like morphology with multiple planes, an SSA that was 1.6-fold larger, increased porosity, the formation of heterojunctions, and a negative surface charge attracting RhB. Further investigation indicated that adsorption by BOI2/BMO fitted the pseudo-second-order kinetic and the Langmuir isotherm models. In addition, the thermodynamic analysis showed that it was a spontaneous exothermic process probably relying on physisorption. Thus, the BOI/BMO adsorbent developed here is promising for the fast removal of toxic dyes from industrial wastewater.Keywords:BiOI/Bi2MoO6;heterostructure;rhodamine B;dark adsorption;kinetics;thermodynamic
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
RSC Advances
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2017
·Vol. 7
·期 5
·2943-2952
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IF 3.108
Jia Yang,Xiaojun Niu,Shaorong An,Weiyi Chen,Jie Wang,Wei Liu
A novel Bi2MoO6–MIL-100(Fe) heterostructure photocatalyst was synthesized by a facile solvothermal method for the first time, and characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectra, transmission electron microscopy, and photoluminescence spectra. The as-prepared Bi2MoO6–MIL-100(Fe) composites exhibited excellent photocatalytic activity and stability towards the degradation of Rhodamine B (RhB) under visible light irradiation. The introduction of MIL-100(Fe) into semiconductor Bi2MoO6 improved the photocatalytic performance remarkably, and the optimal composite with 9% MIL-100(Fe) content showed the highest photocatalytic activity. According to the active radical trapping experiments, the h+ and ˙O2− radicals were the two main active species in the photocatalytic reaction. The enhanced photocatalytic performance is mainly attributed to the formation of the Bi2MoO6–MIL-100(Fe) heterostructure, which is beneficial to the transfer and separation of photo-generated electron–hole pairs. The possible mechanism of the enhanced photocatalytic performance of the Bi2MoO6–MIL-100(Fe) composites was discussed.
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
FUEL
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2020
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IF 5.578
Zisheng Zhang,Chenxiao Zhao,Shuanglong Lin,Hong Li,Yalan Feng,Xin Gao
A novel oxygen vacancy (OVs) modified Bi 2 MoO 6 /WO 3 hybrid electrode based on the ITO glass was successfully fabricated by a facile two-step hydrothermal and solvothermal method with one calcination process between two reactions. The result exhibited an enhanced optical harvesting and photogenerated electron migration capability. In the degradation process of rhodamine B (RhB), the hybrid electrode showed a better photoelectrocatalytic removal ratio of 80.1% within 4 h under visible light irradiation and 2.0 V bias, which is mainly ascribed to the synergistic promotion of surface OVs, heterostructure and external bias. The optical features and band structures of the composite catalyst were analyzed to give out the possible electrode system mechanism of the PEC degradation process. This work not only constructs a newly designed OVs Bi 2 MoO 6 /WO 3 photoelectrode but also provides some investigations in fabricating and controlling process of photoelectrodes.
研究领域:
材料科学
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环境科学
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光催化
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Longting Qi,Yujing Xie,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Bi 2 MoO 6 has drawn considerable attention in the field of photocatalysis owing to its excellent visible light response and photo-generated carriers transport ability. However, pure Bi 2 MoO 6 suffers from the limited surface-active sites and poor photogenerated charge separation efficiency, resulting in unsatisfactory photocatalytic performance. Herein, the 2D/2D Bi 2 MoO 6 /BiOBr Z-scheme heterojunction photocatalysts were synthesized by in-situ hydrothermal growth of Bi 2 MoO 6 on BiOBr. The optimized heterojunction catalyst, Bi 2 MoO 6 /BiOBr-40 % exhibited a CH 3 OH yield of 6.21 μmol·g -1 ·h -1 , which was twice that of the pure Bi 2 MoO 6 . Simultaneously, mechanism study by the band potential estimation and electron spin resonance (ESR) analysis evidenced that the enhanced activity was ascribed to the Z-scheme. This unique structure could enhance the spatial separation of electron-hole pairs, remain the strong redox ability. Moreover, the density functional theory (DFT) calculations were carried out to further expose the charge transfer mechanism of composites. This paper provided a novel approach for the design and manufacture of 2D/2D Z-scheme heterojunctions for energy conversion and environmental remediation.
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
CHEMOSPHERE
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2022
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IF 8.943
Bingzhi Yu,Wen Yan,Yunjuan Meng,Yinan Zhang,Xizi Li,Yan Li,Yuchi Zhong,Jiafeng Ding,Hangjun Zhang
Environmental-friendly and efficient strategies for triclosan (TCS) removal have received more attention. Influenced by COVID-19, a large amount of TCS contaminants were accumulated in medical and domestic wastewater discharges. In this study, a unique g-C 3 N 4 /Bi 2 MoO 6 heterostructure was fabricated and optimized by a novel and simple method for superb photocatalytic dechlorination of TCS into 2-phenoxyphenol (2-PP) under visible light irradiation. The as-prepared samples were characterized and analyzed by XRD, BET, SEM, XPS, etc. The rationally designed g-C 3 N 4 /Bi 2 MoO 6 (4:6) catalyst exhibited notably photocatalytic activity in that more than 95.5% of TCS was transformed at 180 min, which was 3.6 times higher than that of pure g-C 3 N 4 powder. This catalyst promotes efficient photocatalytic electron-hole separation for efficient dechlorination by photocatalytic reduction. The samples exhibited high recyclable ability and the dechlorination pathway was clear. The results of Density Functional Theory calculations displayed the TCS dechlorination selectivity has different mechanisms and hydrogen substitution may be more favorable than hydrogen abstraction in the TCS dechlorination hydrogen transfer process. This work will provide an experimental and theoretical basis for designing high-performance photocatalysts to construct the systems of efficient and safe visible photocatalytic reduction of aromatic chlorinated pollutants, such as TCS in dechlorinated waters.
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
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Chenmei Gao,Yu Xie,Yong Chen,Yun Ling,Yongcun Ma,Yifan Zhang,Yi Shao
One of the major challenges in photocatalytic hydrogen production is to improve the separation efficiency of photo-generated carriers. Therefore, we prepared ZIS/BMO heterojunctions by hydrothermal method to promote the directional separation of photogenerated carriers. A series of characterization results show that the successful preparation of heterojunctions substantially increases the separation and transfer rate of photogenerated carriers. 11% ZIS/BMO had the highest photocatalytic hydrogen production performance reached 1502.6 μmol/g/h, which is 2.78 times than ZIS monomer . Simple construction of heterojunctions but dramatic improvement of photocatalytic hydrogen production performance opens up new horizons for photocatalyst modification.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Materials Today Communications
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2023
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IF 3.8
Fenting Yu,Beiyang Guo,Yuan Zhuang,Sridhar Komarneni,Jianfeng Ma
The ZnFe 2 O 4 -Bi 2 MoO 6 composite photocatalyst was applied to construct a persulfate activation system combined with photocatalysis . The composite material was synthesized by a simple hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (UV-Vis DRS) to study the phase formation, morphology, valence state of elements and light absorption property, respectively. The experimental results showed that the degradation efficiency of tetracycline can reach 84 % in 40 min under visible light, with K 2 S 2 O 8 as the co-catalyst. The principal advantage of this system is that it can be applied to a wide pH range (3−11) with negligible influence. This system is also less affected by anions (HCO 3 2- , NO 3 - , Cl - ,) and humic acid (HA). The excellent catalytic performance may be due to the retention of electron hole pairs with high redox ability after the construction of heterojunction and the formation of active radicals, O 2 •- , SO 4 •- and •OH. In addition, the ZnFe 2 O 4 /Bi 2 MoO 6 composite catalyst showed good stability and recyclability.
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
危险品化学品经营许可证（带存储）