SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Meichao Gao,Dafeng Zhang,Xipeng Pu,Hong Li,Dongdong Lv,Bingbing Zhang,Xin Shao
Bi/BiOBr photocatalysts with improved photodegradation performances were synthesized by a facile one-step hydrothermal method using ethanol–water mixed solution. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, UV–vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The addition of ethanol results in the partial reduction of Bi 3+ ions to metallic Bi, different morphology from pure BiOBr , and the formation of oxygen vacancies. The dosage of ethanol plays a vital role in the morphologies and photodegradation performances of as-obtained Bi/BiOBr. The Bi/BiOBr photocatalysts show improved photodegradation performances, which is attributed to the high surface area, narrow band gap, and inhibited recombination of electron–hole pairs .
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 11
·1765-1775
·
IF 4.5
Xu Jialiang,Jian Jian,Dan Yixiao,Song Jie,Meng Lingxi,Deng Pei,Sun Weijie,Zhang Yusheng,Xiong Jinhua,Yuan Zhengqiu,Zhou Hu
A stable and recyclable of BiOBr/silk fibroin-cellulose acetate composite film was prepared by blending-wet phase transformation and in situ precipitate technology. The cellulose acetate film modified by silk fibroin formed a finger-shaped porous structure, which provided a large space for the uniform growth of BiOBr nanosheets and facilitated the shuttle flow of dyes in film. The morphology, phase structure, and optical properties of the composite films were characterized using various techniques, and their photocatalytic performance for dye wastewater was evaluated under visible light irradiation. Results showed that the BiOBr/SF-CA composite film exhibited efficient photocatalytic activity with 99.9% of rhodamine B degradation rate. Moreover, the composite film maintained high catalytic stability because Bi as the active species deposited on the film showed almost no loss. Finally, the possible photocatalytic mechanisms in the BiOBr/SF-CA composite film were speculated through radical-trapping experiments and electron spin resonance testing.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 2
·1-14
·
IF 2.02
Liu Yuling,Wu Qingsheng
The novel BiOBr flower-nanospheres embedded by hexagonal Cu have been synthesized successfully through an ingenious design, by one-step solvothermal process with two kinds of bifunctional reagents, namely, 1-hexadecyl-3-methylimidazolium bromide [C 16 min]Br and ethylene glycol (EG). Pure BiOBr flower-sphere has been synthesized by solvothermal process. In the result of Cu-embedded BiOBr flower-nanospheres, the diameter of the flower-sphere is about 1.5 μm (±0.1) with hexagon copper about 10-nm side length in the petals of BiOBr flower-nanospheres. The Cu-embedded BiOBr composites exhibit high photocatalytic activity than pure BiOBr, which was investigated by the degradation of rhodamine B solution (RhB) and methyl orange solution (MO) under simulative visible-light irradiation. Nearly 100 and 80% of conversion can be achieved from the degradation of RhB and MO after 1.5 h, respectively. The high ability of photocatalysis may be attributed to the narrow-band-gap semiconductor BiOBr, high electron transportation of copper, and the coupling of Cu and BiOBr. It can lead to the strong absorption in the visible region and improve the separation of photogenerated electron–hole pairs.
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 ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhenyu Cai,Jingjing Wang,Hao Fu,Yuehua Pan,Mingyue Ma,Yuqian Zhong,Yuxiang Deng,Yuezhou Wei,Toyohisa Fujita,Xinpeng Wang
The utilization of nuclear energy generates a substantial volume of wastewater containing uranium, posing a significant threat to both aquatic ecosystems and human health. The current photocatalytic materials utilized for uranium extraction commonly exhibit insufficient redox capabilities, inefficient separation of photogenerated carriers, and challenging recovery. Therefore, recyclable TiO 2 /SrTiO 3 /BiOBr (TSB) dual Z-scheme heterojunction fiber membrane materials with dual oxidation sites were successfully synthesized, with advantages of rapid carrier separation and transfer and a broad photo-response range of the dual Z-scheme heterojunctions. Due to the presence of dual oxidation sites, TSB exhibited an exceptional uranium extraction performance, achieving a remarkable 98.9 % extraction rate without the need for sacrificial agents, which was 2.48, 1.79, and 3.34 times of those of ordinary TiO 2 , SrTiO 3 , and BiOBr, respectively. The extraction rate of uranium from TSB was 85 % after five cycles. Optical and photoelectric tests revealed that TSB reduced the bandgap width by 0.25 eV compared to that of TiO 2 , enhanced the fluorescence lifetime by 1.3 ns, lowered the electrical resistance, and higher optical current density, confirming the effective charge transport at the catalyst interfaces. The charge transfer routes in the TSB dual Z-scheme were confirmed by X-ray photoelectron spectroscopy and density functional theory. The potent oxidizing ·OH generated by TSB played a crucial role in facilitating the conversion of U(VI) into insoluble (UO 2 )O 2 ·2H 2 O. In conclusion, this work provides a novel strategy for the design of dual Z-scheme heterojunctions and offers a new method for practical and recoverable uranium extraction.
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 SURFACE SCIENCE
·
2025
·
IF 6.9
Dong Chen,Rui Zhang,Jie He,Maoqin Xu,Zixi Li,Yujie Liu,Dongyuan Li
A nitrogen-deficient g-C 3 N 4 -BiOBr-Bi 2 WO 6 /PVDF composite ultrafiltration membrane with high-efficiency retention and degradation capabilities for various dyes and antibiotics was prepared using a simple in situ deposition combined with phase inversion method. Under normal pressure, the membrane achieved a retention rate of over 95 % for multiple dyes, featured numerous hydrophilic sites, and demonstrated an average pollutant flux of 147.6L·m −2 ·h −1 . In a simulated visible solar light flow-circulation device, the composite membrane exhibited excellent efficiency and final degradation performance, achieving a degradation rate of 97.7 % for RhB within 1 h and a final degradation rate of 99.6 %. DFT calculations provided evidence for the potential distribution and interaction forces between nanoparticles and PVDF molecules, supporting the observed results. The in situ synthesized BiOBr nanomaterials grow and embed within the membrane, forming heterojunctions with an internal electric field alongside other materials. The incorporation of heterojunction materials improves the surface and internal physical structure of the PVDF membrane, endowing it with excellent photocatalytic degradation performance, enhanced hydrophilicity, and improved retention capabilities. Additionally, the composite membrane exhibits outstanding self-cleaning properties. This work provides a broad-spectrum and efficient solution for water pollution 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
MOLECULES
·
2025
·Vol. 30
·期 6
·1286
·
IF 4.6
Yiran Zhang,Boyuan Xuan,Jiekai Wang,Xiang Chen,Changwei Zhao,Lixia Zhao,Jing Kang
The rational design of BiOBr photocatalysts with optimized surface properties and enhanced photooxidative capacities is crucial. This study proposes a synergistic strategy combining hydroxyl-rich solvents with polyvinylpyrrolidone (PVP) surfactants to modulate the structural and electronic properties of BiOBr through a solvothermal approach. The resulting self-assembled microspheres demonstrated exceptional efficiency in degrading ciprofloxacin (CIP), methyl orange (MO), and rhodamine B (RhB). Among the synthesized variants, BiOBr-EG-PVP (fabricated with ethylene glycol and PVP) exhibited the highest photocatalytic activity, achieving near-complete removal of 20 mg/L CIP and RhB within 10 min under visible light irradiation, with degradation rates 60.12–101.73 times higher than pristine BiOBr. The structural characterization revealed that ethylene glycol (EG) not only induced the formation of self-assembled microspheres but also introduced abundant surface hydroxyl groups, which simultaneously enhanced the hole-mediated oxidation capabilities. The incorporation of PVP further promoted the development of hierarchical honeycomb-like microspheres and synergistically enhanced both the hydroxyl group density and photooxidative potential through interfacial engineering. Density functional theory (DFT) calculations confirmed that the enhanced photooxidative performance originated from an increased surface oxygen content. This work elucidates the synergistic effects of hydroxyl-rich solvents and surfactant modification in the fabrication of advanced BiOBr-based photocatalysts, providing new insights for high-performance photocatalysis for environmental remediation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Meichao Gao,Dafeng Zhang,Xipeng Pu,Huiyan Ma,Changhua Su,Xin Gao,Jianmin Dou
BiPO 4 /BiOBr photocatalysts were successfully prepared via a facile in situ chemical transformation method. The X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–vis diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, photoluminescence and photocurrent measurements were employed to characterize the crystal structures, morphologies, optical properties, and electron-hole separation efficiency of as-synthesized photocatalysts. BiPO 4 /BiOBr composites exhibited much higher photocatalytic activity for the degradation of Rhodamine B than pure BiOBr under visible light irradiation. The significant enhancement of photocatalytic activity could be mainly ascribed to the formation of heterojunction structure of BiPO 4 /BiOBr composite which can effectively improve electron–hole separation during photocatalytic process. Moreover, the effects of Cl − , SO 4 2− , NO 3 − and HCO 3 − anions on the photodegradation performance were investigated, and the as-synthesized BiPO 4 /BiOBr photocatalysts exhibit excellent photo-stability under visible light irradiation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xianbo Sun,Weiyu He,Xiaodi Hao,Haodong Ji,Wen Liu,Zhengqing Cai
A novel solar active AgBr/BiOBr/TiO 2 catalyst was synthesized by a facile coprecipitation method for solar-driven water remediation . The synthesized material composed of flower-like TiO 2 nanoparticles loaded on BiOBr nanosheets and with homogeneous surface distributed Ag/AgBr nanoparticles. The internal electric field between BiOBr/TiO 2 heterojunction greatly facilitated the charge carrier migration; the introduction of narrow band gap semiconductors (AgBr and BiOBr) promoted the visible light adsorption; and the Ag/AgBr nanoparticles acted as photosensitizer to further improve the light utilization. The new material showed 7.6- and 4.0-times activity of pure TiO 2 and BiOBr under solar light, and the contribution of reactive species on anthracene degradation followed the order of h + > O 2 • − > •OH. The degradation mechanism and pathway were proposed based on intermediates analysis and DFT calculation. The QSAR analysis revealed that the environmental risks of contaminants were greatly reduced during the photocatalysis process but some intermediates were still toxic. The high photocatalytic activity, stability and adaptability all indicated that this new material owns great application potential for cost-effective photocatalytic remediation of persistent organic contaminants under solar light.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2014
·Vol. 7
·期 3
·1116-1126
·
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
·
光催化
·
纳米材料
·
环境化学
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Bo Yang,Wenjing Wang,Zhenzhong Hu,Boxiong Shen,Sheng-Qi Guo
Developing new photocatalysts to achieve efficient removal of phthalate esters (PAEs) in water is an important research task in environmental science. However, existing modification strategies for photocatalysts often focus on enhancing the efficiency of material photogenerated charge separation, neglecting the degradation characteristics of PAEs. In this work, we proposed an effective strategy for the photodegradation process of PAEs: introducing vacancy pair defects. We developed a BiOBr photocatalyst containing “Bi-Br” vacancy pairs, and confirmed that it has an excellent photocatalytic activity in removing phthalate esters (PAEs). Through a combination of experimental and theoretical calculations, it is proved that “Bi-Br” vacancy pairs can not only improve the charge separation efficiency, but also alter the adsorption configuration of O 2 , thus accelerating the formation and transformation of reactive oxygen species . Moreover, “Bi-Br” vacancy pairs can effectively improve the adsorption and activation of PAEs on the surface of samples, surpassing the effect of O vacancies. This work enriches the design concept of constructing highly active photocatalysts based on defect engineering, and provides a new idea for the treatment of PAEs in water.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Huawang Zhao,Yuxin Xie,Bihong Lv,Guohua Jing,Yongdan Li
The CO 2 electrochemical reduction reactions (CO 2 ER) to produce high-value formate are crucial for closing the anthropogenic CO 2 cycle. Modulating the adsorption energy between *OCHO and Bi atoms in Bi-based catalysts could enhance both the activity and selectivity for formate formation. Here, a Bi/BiOBr nanosheet with highly dispersed Bi single atoms in intercalations was synthesized through NaBH 4 treatment of BiOBr, which retained the intercalated Bi atoms after electrolysis (Bi/BiOBr-D). The intercalated Bi atoms optimize the Bi-6p band center (0.016 eV) and charge distribution in Bi/BiOBr-D, enhancing the coupling between the O-2p orbitals of *OCHO and the Bi-6p orbitals as well as the electron transfer dynamics between Bi and the *OCHO intermediate, which improves the stability of the *OCHO intermediate during CO 2 ER. Further studies demonstrate that enhanced *OCHO adsorption reduces the Gibbs free energy barrier for the CO 2 →*OCHO process and suppressing the formation of the *H intermediate. Those advantages lead to high selectivity (FE of 96.83 %) in H-type cell, and excellent activity (j HCOO- of 815 mA/cm²) and productivity (15.22 mmol/h·cm²) in flow cell for formate production over Bi/BiOBr-D sample.
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Hanlu Zeng,Yunlan Xu,Dengjie Zhong,Qingmei Qiao,Yuqin Yang
The performance of a photocatalytic fuel cell (PFC) depends on its photoelectrode. In this work, a novel three-dimensional flower-like hierarchical photoanode Zn Zr MOF/FeWO 4 /BiOBr/Ti was synthesized, characterized and applied in PFC to degrade rhodamine B and generate electricity simultaneously. The characterization results of XRD, SEM, EDS, FI-IR, DRS, and XPS show that the photoanode was successfully prepared. The loading of FeWO 4 and Zn Zr MOF widened the nanosheet spacing of BiOBr, which enhanced the light absorption intensity, broadened the light absorption band edge from 467.6 nm to 490.2 nm, and increased the photocurrent density from 0.0149 mA/cm 2 to 0.156 mA/cm 2 . The maximum photocurrent density, maximum power density, degradation rate , and FF of the PFC with the prepared photoanode were respectively 0.256 mA·cm −2 , 22.65 μW·cm −2 90.48 % (1 h), and 0.216, which were far higher than those of PFCs with mono and binary photoanodes. The strong photocatalytic performance of the photoanode is attributed to the type II heterojunction formed between BiOBr and FeWO 4 , which helps to separate electron-hole pairs. The main reactive materials responsible for degrading rhodamine B are h + and ·O 2 - . This research provides a new idea for developing an efficient visible light response photoanode.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）