SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
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IF 5.589
Shuai Fu,Xianming Liu,Yunhui Yan,Li Li,Haiping Liu,Fengying Zhao,Jianguo Zhou
Herein, an efficient broad-spectrum WS 2 /BiOBr heterostructure with ultrathin nanosheet was successfully prepared by one-pot hydrothermal route. The self-assembled flower-like WS 2 /BiOBr nanostructure was formed by few-layer WS 2 and BiOBr nanosheets. The optimized heterojunction presented broad-spectrum high-efficiency photocatalytic activity towards the removal of various pollutants under visible-light irradiation, including organic dyes, antibiotics and phenols. This efficiency was linked to high light harvesting combined with effective charge separation/transfer. Meanwhile, the degradation efficiencies varied with nature of the pollutant decreased in the following order: LR5B (99%) > MNZ (97%) > TC (92%) > OTC (92%) > RhB (90%) > CIP (83%) > MB (78%) > MO (62%) > bisphenol (42%) > phenol (40%). The photocatalytic process of ciprofloxacin was explored, and the results indicated that high ciprofloxacin concentrations, low pH values and elevated concentrations of ions (PO 4 3− , HPO 4 2‐ , H 2 PO 4 − , and Cu 2+ ) restrained the photocatalytic performances. Trapping experiments and ESR revealed the significant contribution of holes (h + ) in the mechanism, where both superoxide radicals ( O 2 − ) and hydroxyl radicals ( OH) acted as assistants. Overall, this work could offer a new protocol for the design of highly efficient heterostructure photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jian Ma,Congjie Liang,Changjiang Yu,Huaming Li,Hui Xu,Yingjie Hua,Chongtai Wang
Photocatalytic reduction of hexavalent chromium (Cr(VI)) is an effective way to reduce its environmental risk. However, it remains a challenge to achieve a high removal rate in mild conditions. In order to efficiently remove Cr(VI) from water, a novel Z-scheme heterojunction composite photocatalyst rCB-20 (Cu 2 O/rGO/BiOBr, 20% Cu 2 O) was successfully prepared using a simple two-step strategy in this work. The characterizations of the catalyst show that the Z-scheme heterojunction formed between Cu 2 O and BiOBr is favorable for facilitating the separation of photogenerated carriers. The existence of rGO can reduce the resistance of electron transport. Therefore, the composite photocatalyst exhibits a very high photocatalytic activity in the photoreduction of Cr(VI). For example, using it to completely remove Cr(VI) with a concentration of 20 mg•L −1 in the pH = 4 solution only requires 40 min. Even the complete removal of the same concentration of Cr(VI) in neutral water at pH 7 does not take more than 90 min. Meanwhile, it possesses a high stability in catalytic activity and structure.
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
SOLID STATE SCIENCES
·
2022
·
IF 3.752
Peijie Weng,Qing Cai,Linfeng Zhang,Huadong Wu,Kun Wu,Jia Guo
In this study, the Mo -doped hollow hierarchical Bi/BiOBr microspheres are prepared by the solvothermal method with the Sn 2+ as reductant. The prepared composites show a good degradation effect for ciprofloxacin (CIP) under visible light. Especially, the BSM-22 composite show the best photocatalytic activity, with the apparent rate constant k as high as 0.03014 min −1 , which is 26.9 times that of the pure BiOBr. It is assumed that the introduction of Sn 2+ facilitate the formation of hollow hierarchical microspheres structure of BiOBr microspheres and the appearance of metallic Bi on the surfaces. Therefore, the transfer and separation efficiency of photogenerated charges is increased in the composites. Impressive, benefit from the microtopography of the hollow structure, the specific surface area of the BSM-22 (53.476 m 2 /g) is 21.76 times than that of the BiOBr (2.458 m 2 /g). The doping of Mo reduces the band gap of BiOBr (exactly from 2.61 to 1.96 eV) and broaden the photoabsorption region. Therefore, the photocatalytic activity of the Mo -doped Bi/BiOBr microspheres are heavily improved in dealing with different kinds of antibiotic molecules. More importantly, these results show that the design strategies of heteroatom doping, metal bismuth production, and morphology control of the bismuth oxybromide composite can greatly improve the visible-light catalytic activity.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Hao Xu,Jian Yang,Yang Li,Fan Fu,Kang Da,Shaobo Cao,Wenting Chen,Ximei Fan
Weak visible-light capture ability, ultrahigh charge recombination rate, and poor redox ability are crucial constraints to improve the photocatalytic performance for toluene degradation under visible-light. Hence, a dual Z-scheme of Bi 2 O 3 quantum dots decorated TiO 2 /BiOBr photocatalysts (Bi 2 O 3 QDs@TiO 2 /BiOBr) were prepared by a two-step hydrothermal method . X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) were performed to identify the existence of Bi 2 O 3 QDs and TiO 2 that loaded on the surface of BiOBr. The introducing of oxygen vacancies in TiO 2 broadened its light absorption region to the visible-light. The constitutes of Bi 2 O 3 QDs and BiOBr were regulated and the optimized photocatalyst BT1-B10 exhibited 94.1 % of removal rate for gaseous toluene degradation after 150 min irradiation of visible-light (>420 nm) as well as good recoverability and durability. This result was obviously superior to other comparison samples. In-situ DRIFTs spectra and Gas Chromatography-Mass Spectrometry (GC-MS) were carried out to provide a possible pathway for the toluene degradation. Additionally, a dual-channel electron transfer model based on the Z-scheme was proposed, which presented desirable visible-light response region, efficient charge separation efficiency, and enhanced redox ability. Notably, hydroxyl radicals (•OH) served as the dominant active species was confirmed by electron spin resonance (ESR) and gas-phase capture tests, that was beneficial to the ring-opening of toluene degradation. This dual Z-scheme heterojunction of Bi 2 O 3 QDs@TiO 2 /BiOBr photocatalyst showed great potential for the degradation of toluene under visible-light irradiation.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jiayi Chen,Xinyan Xiao,Yi Wang,Mingli Lu,Xingye Zeng
A novel AgI/BiOBr/reduced graphene oxide (RGO) composite was prepared through a facile solvothermal method followed by an in-situ precipitation process. The as-prepared AgI/BiOBr/RGO ternary composite exhibited significantly enhanced photocatalytic activity towards the degradation of tetracycline (TC) under simulated sunlight irradiation. The degradation rate of AgI/BiOBr/RGO was approximately 5.9 and 2.9 times higher than that of pristine BiOBr and AgI, respectively. The improved photocatalytic activity of AgI/BiOBr/RGO composite could be ascribed to the synergistic effect of AgI, BiOBr and RGO. The RGO/BiOBr nanosheets could provide aboundant reactive active sites and serve as appropriate substrates for in-situ growth of AgI NPs. Furthermore, RGO with superior electronic conductivity accelerated the separation of photogenerated electron-hole pairs in AgI/BiOBr/RGO composite, as well as extended visible-light absorption capability. The possible degradation pathway of TC was proposed through the identification of intermediate products using LC-MS analysis. Additionally, combined with the results of active species trapping experiments and ESR measurements, a possible mechanism of RGO-promoted Z-scheme charge transfer for AgI/BiOBr/RGO composite was proposed.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 29
·19606-19611
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IF 3.3
Xiaotong Zhang,Yang Gao,Zhenfang Xing,Di Peng,Yonghao Han
In this work, we prepared a BiOBr powder sample by the coprecipitation method for in situ high-pressure AC impedance spectroscopy tests, in situ high-pressure Raman measurements and in situ high-pressure X-ray diffraction experiments to explore its structural properties and electrical transport processes under compression. Two pressure-driven isostructural phase transitions, T–T′ and T′–T′′ (T – tetragonal, T′ – tetragonal 1 and T′′ – tetragonal 2), were discovered at around 10.0 and 15.0 GPa, respectively. The pressure-induced changes in the crystal structure and electrical transport of BiOBr can provide a reference for explaining the mechanism of the isostructural phase transition of other similar compounds after compression.
研究领域:
材料科学
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固体物理
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凝聚态物理
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DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
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2021
·Vol. 134
·期 2
·1003-1015
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IF 2.081
Chen Anna,Zhang Jin,Zhou Yi,Tang Haiqin
In this study, the MOF-5/BiOBr photocatalyst with microsphere structure was synthesized by hydrothermal method for the first time. The crystal structure, morphology, photoelectric performance and photocatalytic activity of the samples were characterized by XRD, SEM, TEM, XPS and electrochemistry. The results show that the synthesized MOF-5/BiOBr photocatalyst exhibits better photocatalytic performance than pure MOF-5 and BiOBr under simulated sunlight. The efficiency of Rhodamine B (RhB) removal based MOF-5/BiOBr composite (MOF-5 with mass ratio of MOF-5/BiOBr = 20 wt% of) reached 99.7%. The possible photocatalytic mechanism is discussed through the capture experiment of active species. The enhanced photocatalytic performance of the MOF-5/BiOBr composite may be related to the interaction between BiOBr and MOF-5 and the type II charge transfer path. The catalyst has simple preparation process, low cost, high activity under natural light, and high efficiency, and is expected to play a role in the treatment of environmental wastewater. This work provides a new insight for designing MOF-5 based photocatalyst.
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
CATALYSIS COMMUNICATIONS
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2024
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IF 3.4
Yanli Sun,Xueliang Wang,Hooi Ling Lee
It is critical to enhance the photocatalytic performance of BiOBr through appropriate strategies. Two BiOBr samples with different water (W) and ethylene glycol (EG) solvents have been synthesized. BiOBr-EG presents a 3D nest-like morphology composed of nanoplates, prominently emphasizing (110) facets. In contrast, BiOBr-W displays 2D microplates with exposed (102) facets. Notably, BiOBr-EG exhibits a degradation rate 7.4 times faster and removal efficiency of Enrofloxacin (ENR) 2.2 times greater than that of BiOBr-W. Additional investigations reveal that ·O 2 − plays a dominant role in the degradation process. Finally, the degradation pathways are explored through DFT calculation and HPLC-MS methods.
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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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 11
·1909
·
IF 5.719
Chu-Ya Wang,Qi Zeng,Li-Xia Wang,Xin Fang,Guangcan Zhu
Based on the low utilization rate of visible light and the high-charge carriers-recombination efficiency of bismuth oxybromide (BiOBr), in this work, noble metal Ag was used to modify BiOBr, and Ag-doped BiOBr nanoplates (Ag-BiOBr) were obtained through a one-step hydrothermal method. Compared with BiOBr, the absorption edge of Ag-BiOBr showed a redshift from 453 nm to 510 nm, and the absorption efficiency of visible light was, obviously, improved. Bisphenol A (BPA) was chosen as the target pollutant, to evaluate the photocatalytic performance of the samples. Ag0.1-BiOBr showed the highest degradation efficiency. The intrinsic photocatalytic activity of Ag0.1-BiOBr, under visible light, was approximately twice as high as that of BiOBr. In this way, a new visible-light-driven photocatalyst was proposed, to fight against organic pollution, which provides a promising strategy for water and wastewater treatment.Keywords:bismuth oxybromide (BiOBr);Ag-doping modification;visible light;charge separation;bisphenol A (BPA)
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
Surfaces and Interfaces
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2022
·
IF 6.137
Ling-Ling He,Jing-Yi Bai,Xiao-Yan Li,Shuang Qi,Song Li,Xin Wang
A series of BiOBr/MgFe 2 O 4 composites were synthesized and characterized. Tetracycline (TET) was used as a model antibiotic to verify the sonocatalytic activities of these BiOBr/MgFe 2 O 4 composites. When the mass ratio of BiOBr to MgFe 2 O 4 in the BiOBr/MgFe 2 O 4 composites was 20%, the BiOBr/MgFe 2 O 4 composite (BM-20) showed the best catalytic performance to the sonocatalytic removal of TET. Under the optimum conditions, such as the addition of catalyst 2.0 g/L, pH 7 and ultrasonic power 500 W, the initial concentration of TET 10 mg/L, the sonocatalytic removal rate of TET reached 91.10±2.36% in 30 min using BM-20 as a sonocatalyst, which was significantly better than that of MgFe 2 O 4 (52.3±2.23%). The generated hydroxyl free radicals (•OH), holes ( h + ) and superoxide anion radical (•O 2 − ) played major roles in the sonocatalytic removal process. The improved sonocatalytic performance of BM-20 was due to the S-scheme heterojunction formed between BiOBr and MgFe 2 O 4 , which could separate electron-hole ( e − -h + ) pairs effectively. Besides, BM-20 had great stability and reusability. To conclude, the fabrication of heterojunction was an effective method to improve the sonocatalytic performance of catalyst. The BiOBr/MgFe 2 O 4 composites could be satisfactory utilized as a catalyst in the sonocatalytic elimination of organic contaminant.
研究领域:
环境科学
·
催化材料科学
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产品关联
DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 11
·2394-2400
·
IF 4.674
Wenhua Liu,Yuan Gao,Yuping Yang,Quan Zou,Guoxiang Yang,Ziping Zhang,Huifan Li,Yingchun Miao,Hexing Li,Yuning Huo
Graphical Floating foams : A floating BiOBr@graphene oxide@melamine foam composite is developed by using a solvothermal process. The melamine foam provided the transfer channels for organics, the BiOBr nanosheets presented efficient photodegradation of organics, and graphene oxide further improved the light utilization and inhibited charge recombination. In view of the synergistic effect of adsorption and photocatalysis, this composite efficiency realized improved rhodamine B removal with increased concentration. Hierarchical photocatalytic composite BiOBr@graphene oxide@melamine foam was developed by using a solvothermal process. In this composite, the graphene oxide-wrapped melamine foam acted as the substrate for supporting the catalyst, and the BiOBr nanosheets stably combined with the graphene oxide surface in a uniform distribution. This composite could be floated on the solution surface to inhibit the light shielding effect of colorful organic pollutants. Furthermore, the graphene oxide-wrapped melamine foam provided mass transfer channels for organics and enriched the organics in its 3D structure. BiOBr nanosheets presented efficient photodegradation of organics and solved the problem of adsorption saturation of graphene oxide@melamine foam. Graphene oxide could further improve the light utilization, inhibit the recombination of charges, and enrich the organics. In view of the synergistic effect of adsorption and photocatalysis, this catalyst system realized the efficient removal of the organic rhodamine B and presented the promoted amount of contaminant removal with increased rhodamine B concentration.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zeshuang Kong,Ruiqi Zhang,Jixian Dong,Jiahui Yu,Dafeng Zhang,Junchang Liu,Peiqing Cai,Xipeng Pu
With the increasing needs of people for a better life, the problem of water resources pollution has attracted wide attention. The construction of p-n heterojunction is an effective strategy to promote the removal of pollutants by photocatalysts. In this work, a series of BiOBr/Cu 2 S heterojunction photocatalysts with mass ratios of Cu 2 S have been synthesized successfully by a hydrothermal method combined with grinding method for photocatalytic degradation of tetracycline (TC) and ciprofloxacin (CIP). The results showed that BiOBr/Cu 2 S exhibited superior photodegradation efficiency of TC and ciprofloxacin CIP than BiOBr and Cu 2 S monomers. When the mass ratio of Cu 2 S is 0.15 %, the visible degradation of CIP and TC are 79.2 % in 90 min and 88.5% in 60 min. In addition, the effects of different inorganic ions and pH value on the photocatalytic performance of BiOBr/Cu 2 S were investigated. It was proved that superoxide free radical (•O 2 - ) was the main active species by free radical trapping experiment. The photocatalytic degradation process was further evaluated by total organic carbon and mass spectrometry tests. This work provides a feasible construction strategy for photocatalysts with potential application in water resources pollutants.
研究领域:
环境科学
·
材料科学
·
水处理
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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）