SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Huihui Ding,Huanhuan Wu,Jun Ma,Xiang Li,Shuangshuang Huai,Chengming Zhang,Haibao Zhu,Ping Li,Jie Li,Xiufang Wang,Wenjie Xie
Artificial photosynthesis converting CO 2 into valuable compounds has garnered significant interest. However, the insufficient surface activity sites, weak adsorption capacity of CO 2 and poor electron-hole separation capability hinder CO 2 photoreduction used for practical implementation. Herein, Bi nanoparticles/Bi 24 O 31 Br 10 composite photocatalyst (Bi/BOB) was designed constructed through in-situ reduction of bismuth metal on the surface of ultra-thin Bi 24 O 31 Br 10 nanosheets. Bi/BOB exhibits an excellent ability to reduce CO 2 to CO. The CO 2 reduction rate of the optimized Bi/BOB composite catalyst is 43.07 μmol·g −1 ·h −1 , which is significantly superior to other reported bismuth-based photocatalysts. Experimental characterization and Theoretical simulation calculation reveal that the in-situ reduction of bismuth metal causes significant local lattice distortion and uneven charge distribution, thereby producing a strong interaction between Bi nanoparticles and BOB support. So, it enhances the adsorption and activation of carbon dioxide molecules and reduces the Gibbs free energy barrier during the catalytic reaction. Moreover, the strong interaction helps to enhance the separation of photogenerated charge carriers and stability of catalysts. This study offers research suggestions for the interaction between metal and support to enhance CO 2 reduction.
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
Journal of Water Process Engineering
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2025
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IF 6.7
Yifeng Xu,Xinyu Yang,Chuanzhou Liang,Lai Peng
This study synthesized Bi 24 O 31 Br 10 (BOB) to enhance the photocatalytic degradation of four common pharmaceutical compounds including ofloxacin (OFL), sulfamethoxazole (SMX), favipiravir (FAV) and ibuprofen (IBP). Characterization results demonstrated that BOB exhibited superior photocatalytic properties, including an extensive specific surface area, an optimal band gap and the presence of surface defects. Photocatalytic degradation experiments showed that BOB exhibited substantial adsorption capacity and photocatalytic efficiency for all four pharmaceuticals. Specifically, OFL, IBP, and FAV were removed by >95.5 % within 2 h, and SMX was removed by 57 % (10 mg L −1 pharmaceuticals/100 mg L −1 BOB). The adsorption was facilitated by Brönsted acid sites associated with oxygen vacancies and Lewis acid Bi sites. The degradation mechanism primarily involved key reactive species, including ·O 2 − , ·OH and h + . The degradation pathways for four pharmaceuticals were elucidated, as well as the biotoxicity of the products, which confirmed the alleviating potential of BOB-driven photocatalytic degradation on pharmaceuticals. These findings highlight the future potential of BOB-driven photocatalysis in mitigating pharmaceutical pollution in aquatic environments.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Xin Xiao,Chunxia Zheng,Mingli Lu,Ling Zhang,Fei Liu,Xiaoxi Zuo,Junmin Nan
The selective oxidation of benzyl alcohol (BA) into benzaldehyde (BAD) is an attractive model reaction for organic synthesis. Using a microwave-calcination route, a novel flower-like Bi 24 O 31 Br 10 with surface oxygen vacancies and bromine vacancies was successfully synthesized. In the construction of Bi 24 O 31 Br 10 , glucose acts as a complexing, reducing, and structure-directing agent. The as-synthesized Bi 24 O 31 Br 10 exhibits excellent activity for the photocatalytic aerobic oxidation of BA into BAD, with >99% conversion and >99% selectivity under blue LED irradiation at ambient conditions, which is 3.3-, 4.7-, and 27.8-fold higher than that of TiO 2 , Bi 4 O 5 Br 2 , and Bi 12 O 17 Cl 2 , respectively. The high selectivity is due to the suitable energy band of the as-synthesized Bi 24 O 31 Br 10 (E g = 2.51 eV, valence band potential = +2.38 V), while the high conversion rate is largely due to the efficient separation of photogenerated carriers, surface defects, positively charge surface, and 3D micro/nano-architecture. The primary active species, including h + , e − , O 2 − , and OH, are all involved in the photoreaction. On the basis of experimental results and quantum-chemistry calculations, a direct hole oxidative mechanism with two-step dehydrogenation pathway was suggested. In addition, the as-synthesized Bi 24 O 31 Br 10 catalyst remains stable during the photocatalytic process, indicating its potential for practical applications.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2019
·Vol. 48
·期 6
·3890-3899
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IF 1.676
Xia Yongmei,Su Jiangbin,He Zuming
Promising mesoporous Bi 24 O 31 Br 10 /SrTiO 3 (BOB/STO) nanocomposites were successfully designed and fabricated via a three-step approach. The morphology, structure, optical performance, surface area and pore-size distribution of the products were characterized by x-ray powder diffraction, x-ray photoelectron spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, energy-dispersive x-ray spectroscopy, diffuse reflectance spectroscopy and Brunner–Emmett–Teller analysis. The results indicate that BOB/STO nanocomposites are composed of perovskite STO nanoparticles and monoclinic BOB nanosheets. Compared with pure STO nanoparticles or BOB nanosheets, the mesoporous BOB/STO nanocomposites show a much better photocatalytic activity for the removal of methyl orange solution under simulated sunlight irradiation. In particular, the 10% BOB/STO composite is found to be the optimal composite, over which the dye decomposition reaches 95.3% for 100 min. The photocatalytic decomposition rate of the 10% BOB/STO nanocomposite is found to be 3.4 and 4.09 times higher than that of bare BOB and STO, respectively. The enhanced photocatalytic performance of the BOB/STO nanocomposites is attributed to the efficient charge separation and reduced recombination probability of photogenerated electron–hole (e − –h + ) pairs. Furthermore, the BOB/STO nanocomposites show the considerable stability and recycling capacity in the reaction process. In addition, the photocatalytic mechanism of the BOB/STO nanocomposites is explained by a plausible Z-scheme heterojunction.
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
CHEMICAL ENGINEERING JOURNAL
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2013
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IF 3.473
Xin Xiao,Ruiping Hu,Chao Liu,Chunlan Xing,Xiaoxi Zuo,Junmin Nan,Lishi Wang
A simple, one-step, and energy-saving microwave heating route for rapid synthesis of hierarchical Bi 24 O 31 Br 10 nanoflakes has been demonstrated. And its visible-light photocatalytic performance for the degradation of tetracycline hydrochloride (TC, a commonly used antibiotic) containing in wastewater is investigated systematically. The results reveal that the Bi 24 O 31 Br 10 is obtained by the reaction of BiOBr with OH − over the pH range from 9.5 to 11.5, and the formation mechanism of such hierarchical structure can be explained by a dissolution–recrystallization process under microwave heating. The as-synthesized Bi 24 O 31 Br 10 nanoflakes exhibit a stronger visible light absorption (band gap energy 2.51 eV), higher BET surface area (40.1 m 2 g −1 ), and negatively charged surface, which results in the enhanced photocatalytic activity for the degradation of TC than three-dimensional (3D) BiOBr microspheres under identical visible light irradiation. In addition, the Bi 24 O 31 Br 10 nanoflakes are relatively stable during the reaction and can be used repeatedly, showing promising prospect for the treatment of tetracyclines in future industrial application.
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
Nanoscale
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2014
·Vol. 7
·期 3
·1116-1126
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IF 6.739
Fa-tang Li,Qing Wang,Jingrun Ran,Ying-juan Hao,Xiao-jing Wang,Dishun Zhao,Shi Zhang Qiao
Heterostructured BiOBr/Bi24O31Br10 nanocomposites with surface oxygen vacancies are constructed by a facile in situ route of one-step self-combustion of ionic liquids. The compositions can be easily controlled by simply adjusting the fuel ratio of urea and 2-bromoethylamine hydrobromide (BTH). BTH serves not only as a fuel, but also as a complexing agent for ionic liquids and a reactant to supply the Br element. The heterojunctions show remarkable adsorptive ability for both the cationic dye of rhodamine B (RhB) and the anionic dye of methylene orange (MO) at high concentrations, which is attributed to the abundant surface oxygen vacancies. The sample containing 75.2% BiOBr and 24.8% Bi24O31Br10 exhibits the highest photocatalytic activity. Its reaction rate constant is 4.0 and 9.0 times that of pure BiOBr in degrading 50 mg L−1 of RhB and 30 mg L−1 of MO under visible-light (λ > 400 nm) irradiation, respectively, which is attributed to the narrow band gap and highly efficient transfer efficiency of charge carriers. Different photocatalytic reaction processes and mechanisms over pure BiOBr and heterojunctions are proposed.
研究领域:
材料科学
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光催化
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纳米材料
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环境化学
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半导体物理
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
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2020
·Vol. 30
·期 12
·4954-4968
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IF 1.941
Ding Tingting,Xiao Xinyan,Wang Yi,Lu Mingli
A novel 0D/2D Z-scheme AgI/Bi 24 O 31 Br 10 photocatalyst was prepared through the simple solvothermal and coprecipitation method, in which AgI nanoparticles were decorated on the surface of Bi 24 O 31 Br 10 nanosheets. The AgI/Bi 24 O 31 Br 10 composites exhibited improved photocatalytic activity for the degradation of rhodamine B (RhB) in comparison with pristine Bi 24 O 31 Br 10 and AgI under simulated sunlight irradiation. Specifically, AB-30 (mass fraction of AgI, 30%) composite exhibited remarkable photocatalytic activity of 97.6% towards RhB degradation under 120 min of simulated sunlight irradiation, and its RhB degradation rate constant ( k ) was approximately 20.7 and 2.9 times higher than that of pure Bi 24 O 31 Br 10 and AgI, respectively. The improvement of photocatalytic performance of as-prepared AgI/Bi 24 O 31 Br 10 heterojunction composites was ascribed to the synergistic effect of wide visible-light harvest capacity and the rapid transfer and separation efficiency of charge carriers. UV–vis diffuse reflectance spectra (DRS) analysis validated that the introduction of AgI could broaden the visible-light absorption of AgI/Bi 24 O 31 Br 10 composite. The results of electrochemical impedance (EIS), photocurrent response and photoluminescence spectra (PL) tests showed that AgI/Bi 24 O 31 Br 10 composite possessed the efficient separation and migration of photogenerated charge carriers. Trapping experiments of free radicals certified that ·O 2 − was the main reactive species in the process of degradation. And a probable photocatalytic mechanism of Z-scheme heterojunction between Bi 24 O 31 Br 10 and AgI 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
高影响因子
Chemical Science
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2023
·Vol. 14
·期 46
·13518-13529
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IF 8.4
Jie Liu,Yu Xie,Yiqiao Wang,Kai Yang,Shuping Su,Yun Ling,Pinghua Chen
The challenge of synergistically optimizing different mechanisms limits the further improvement of plasmon-mediated photocatalytic activities. In this work, an Au/Bi24O31Br10 composite, combining an interface ohmic contact and localized surface plasmon resonance (LSPR), is prepared by a thermal reduction method. The LSPR effect induces the local resonance energy transfer effect and the local electric field enhancement effect, while the interface ohmic contact forms a stronger interface electric field. The novel synergistic interaction between the interface ohmic contact and LSPR drives effective charge separation and provides more active sites for the adsorption and activation of CO2 with improved photocatalytic efficiency. The optimized 0.6 wt% Au (5.7 nm) over Bi24O31Br10 nanosheets showed an apparently improved photocatalytic activity without any sacrificial reagents, specifically CO and O2 yields of 44.92 and 17.83 μmol g−1 h−1, and demonstrated superior stability (only lost 6%) after continuous reaction for 48 h, nearly 5-fold enhanced compared to Bi24O31Br10 and a great advantage compared with other bismuth-based photocatalysts.
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
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Wenbin Ruan,Jianli Chen,Shijian Zhang,Xiuxiu Huang,Xiang Li,Shuangshuang Huai,Congliang Cheng,Mingxuan Qu,Hewen Liu,Xiufang Wang,Ping Li
Here, the Bi 24 O 31 Br 10 -based composite photocatalysts modified by bimetallic Bi and Mo nanoparticles (NPs) are designed and prepared (Bi-Mo-Bi 24 O 31 Br 10 ). 2D ultra-thin Bi 24 O 31 Br 10 nanosheets with suitable band gap and good chemical and optical stability are selected as the main catalyst to drive N 2 fixation by generating hot carriers. The Bi NPs in the Bi 24 O 31 Br 10 nanosheets serves as a buffer tank for electrons to improve the efficiency of electron transfer. Meanwhile, the Mo NPs serve as catalytic centers for N 2 adsorption and activation, working synergistically to enhance the overall reaction efficiency. Resulting from semiconductor-to-metal −to-metal electron transfer path and the Mo metal adsorption and activation mechanism, the nitrogen fixation rate of the Bi-Mo-Bi 24 O 31 Br 10 photocatalyst is as high as 191.2 μmol g −1 h −1 , and it is 7.2 times compared to pure Bi 24 O 31 Br 10 . This work creates a novel framework for the rational design of highly efficient visible-light-responsive nitrogen fixation catalysts.
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DOI
高影响因子
SOLID STATE SCIENCES
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2026
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IF 3.6
Feng-Jun Zhang,Zi-Han Yang,Xue-Qin Zhou
Bi 24 O 31 Br 10 /Bi 2 WO 6 photocatalysts are successfully synthesized. • The oxygen vacancies and the Z-scheme heterojunction were formed between Bi 24 O 31 Br 10 and Bi 2 WO 6 . • The heterojunction achieves a CO production rate 3.17 and 2.78 times higher than those of pure Bi 24 O 31 Br 10 and Bi 2 WO 6 , respectively, with nearly 100% CO selectivity. Engineering sophisticated photocatalytic materials remains a critical imperative for CO 2 reduction. A novel Z-scheme Bi 24 O 31 Br 10 /Bi 2 WO 6 was synthesized in this work. Its photocatalytic performance and underlying mechanism of CO 2 photoreduction were systematically investigated. The photocatalytic evaluation demonstrates that BOB/BWO-25 delivers the most outstanding CO 2 reduction performance under atmospheric conditions without sacrificial reagents. Specifically, the catalyst CO evolution rate is 22.66 μmol g −1 h −1 , representing enhancements about 3.17-fold compared with pure Bi 24 O 31 Br 10 and 2.78-fold compared with pure Bi 2 WO 6 . Moreover, the selectivity toward CO reaches 100%. Oxygen vacancies and Z-scheme heterojunction synergistic effect can enhance photocatalytic, which facilitates charge separation and preserves reduction capability. This study provides an effective strategy for designing and fabricating Bi 2 WO 6 -based Z-scheme photocatalysts and enhancing CO 2 photoreduction efficiency. Download: Download high-res image (466KB) Download: Download full-size image
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DOI
高影响因子
GREEN CHEMISTRY
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2025
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IF 9.2
Huihui Ding,Huanhuan Wu,Jun Ma,Xiang Li,Shuangshuang Huai,Shijian Zhang,Wenbin Ruan,Xiuxiu Huang,Xiufang Wang,Wenjie Xie
The high interfacial charge transfer barrier has been a primary thermodynamic obstacle in enhancing the catalytic performance of heterojunction materials. Optimizing the interfacial environment is a promising strategy to attain superior catalytic efficiency. Hence, a Bi/Bi2MoO6/Bi24O31Br10 (Bi/BMO/BOB) composite photocatalyst was constructed by introducing a Bi–O–Mo bridge bond between the BMO and BOB interfaces and modifying metal active sites on the surface of the complex. Bi/BMO/BOB has a good capacity for CO2 photoreduction to CO. The CO yield of the Bi/BMO/BOB photocatalyst is 68.29 μmol g−1 h−1, which is obviously higher than those of the pristine BMO and BOB. As proved by density functional theory (DFT) calculations and experimental characterization, the Bi–O–Mo interface bridge bond adjusts the electronic structure of the contact interface and enhances the interface charge separation and transport rate. Moreover, the metal Bi nanoparticles synthesized through in situ reduction not only realize electron transfer and storage as electron collectors, but also strengthen the adsorption of CO2 molecules. The synergistic action of the two can allow the effective transfer of photogenerated electrons from BMO to BOB, which then accumulate on Bi. Such stepwise transfer of electrons increases the speed of photocatalytic reduction processes that involve multiple electrons, and effectively reduces the reaction energy barrier in the process of CO2 reduction. This mode of interatomic electron transfer bridges combined with the metal active sites not only solves the stability issues in bismuth-based semiconductors, but also aids in the development of more efficient photocatalytic systems for reduction of CO2.
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DOI
高影响因子
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