SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Shilin Xu,Ying-Jie Zhang,Rui Tang,Xinyu Zhang,Zhen-Hu Hu,Han-Qing Yu
Introducing reductive species into heterogeneous catalysts can improve their catalytic efficiency in Fenton-like processes. Iodide ions (I − ), a typical reductive species with good reducibility, might enhance the catalytic performance of H 2 O 2 activation when doped in heterogeneous catalysts. In this study, the iodine-doped Bi 2 WO 6 (I X -Bi 2 WO 6 ) nanosheets were synthesized with a facile hydrothermal method and used to activate H 2 O 2 to degrade bisphenol A (BPA). Compared with Bi 2 WO 6 , which was almost inactive, the I X -Bi 2 WO 6 exhibited great improvement for BPA degradation. Among the fabricated catalysts, the I 0.50 -Bi 2 WO 6 with an iodine content of 0.50 mmol was found to be most effective and could work efficiently in a wide pH range from 4.0 to 10.0. Moreover, with a low consumption of H 2 O 2 (H 2 O 2 : pollutant molar ratio = 10:1), 78% BPA was degraded within 10 min at initial pH 7.0. Unlike the conventional H 2 O 2 activation mechanism, the direct electron transfer was verified to be the main mechanism for the BPA degradation based on the results of electron paramagnetic resonance (EPR) analysis, radical quenching, and electrochemical experiments in this work. Furthermore, the activation of H 2 O 2 by iodine-doped BiVO 4 and Bi 2 MoO 6 was also conducted to validate the applicability of such an iodine doping approach. These results indicate that the introduction of reductive species I − is a promising and effective method to develop highly efficient Bi-based catalysts for H 2 O 2 activation.
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
JOURNAL OF NANOPARTICLE RESEARCH
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2015
·Vol. 17
·期 7
·1-8
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IF 2.184
Yu Ya-Nan,Lu Shi-Yu,Bao Shu-Juan
In this work, Bi 2 WO 6 nanoporous wall was synthesized by using Bi 2 O 3 as template and Bi source. Pt nanoparticles whose average size is about 8 nm were further immobilized on the Bi 2 WO 6 nanoporous wall via a simple chemical reduction process. Their photocatalytic activity and the effect of Pt modification were studied by analyzing the degradation of an organic dye, rhodamine 6G (Rh6G), under simulated sunlight. It was found that the photocatalytic ability of Bi 2 WO 6 nanoporous wall was enhanced by introducing Pt nanoparticles. Bare Bi 2 WO 6 shows a degradation efficiency of 78 % after 1 h, while the degradation efficiency of 5 wt% Pt-modified Bi 2 WO 6 was 99 %, and on further increasing the Pt content in the as-prepared Pt-modified Bi 2 WO 6 catalysts, their photocatalytic ability will decrease. The optimal catalyst could be reused without any decrease for five cycles, which may due to Pt be able to help trap the conduction band electrons in the absence of Rh6G. A possible photocatalytic mechanism was proposed and further proved by transient photocurrent response experiment.
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
APPLIED CATALYSIS A-GENERAL
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2022
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IF 5.723
Mei Su,Honggang Sun,Zhixue Tian,Zihao Zhao,Pan Li
Herein, we designed and prepared a novel two-dimensional/two-dimensional WS 2 /Bi 2 WO 6 heterostructure photocatalyst. Firstly, by first-principles calculations, we found that Bi 2 WO 6 and WS 2 could form a stable WS 2 /Bi 2 WO 6 heterostructure with a type-II band alignment structure. Supporting by the theoretical prediction, a series of WS 2 /Bi 2 WO 6 heterostructures with different amounts of WS 2 were synthesized via a facile hydrothermal method. The WS 2 /Bi 2 WO 6 heterostructures exhibited higher photocatalytic activity in degradation of rhodamine B and oxytetracycline under visible light irradiation than the pure Bi 2 WO 6 and WS 2 . And the WS 2 /Bi 2 WO 6 heterostructure had a large specific surface area and good photo-stability. The photoluminescence spectra and photoelectrochemical measurements showed that the WS 2 /Bi 2 WO 6 heterostructure possessed the ability to facilitate the separation and transfer of photo-generated carries. The active species generated in the photocatalytic system were photo-induced holes, singlet oxygen, and superoxide anion, which were verified by the trapping experiments and electron spin resonance technique. Furthermore, a Z-scheme photocatalytic mechanism was proposed.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Binxia Zhao,Nan Shao,Xingliang Chen,Jixian Ma,Yijia Gao,Xiaoqian Chen
As a novel photocatalyst with visible light responsiveness, Bi 2 WO 6 has excellent activity in treating wastewater containing organic pollutants and noble metals. However, its photocatalytic action is limited due to the rapid recombination of photogenerated electrons and holes. Based on the study of Bi 2 WO 6 , a type Ⅱ heterojunction photocatalyst (WO 3 /Bi 2 WO 6 ) and a Z-scheme heterojunction photocatalyst (CdS/Bi 2 WO 6 ) were constructed. Composites exhibited higher catalytic activity than pure Bi 2 WO 6 . The degradation efficiency of RhB(50 mg/L) and reduction efficiency of Cr(VI) (50 mg/L) by 5%WO 3 /Bi 2 WO 6 catalyst within 60 min of photocatalytic reaction was 98.82% and 53.82%, respectively. The degradation efficiency of RhB and reduction efficiency of Cr(VI) by 15%CdS/Bi 2 WO 6 catalyst was 99.52% and 69.52%, respectively. By studying the structural composition , microscopic morphology, photoelectrochemical performance, and light absorption performance of the catalysts of the two different systems. These mechanisms may help to explain the reasons for the enhanced activity of the composite photocatalysts. In addition, mixed wastewater containing organic pollutants (RhB) and heavy metal ions (Cr(VI)) was used to simulate real and complex wastewater, which provided more ideas for wastewater treatment problems.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Jingjing Wang,Zhiwei Liu,Liying Wang,Lu Li,Qian Liu,Zhiwei Liu,Zhenzhu Cao,Yongfeng Zhang,Lin Cheng,Jucai Yang
A novel photocatalyst WO 3 /BiMOF/Bi 2 WO 6 was prepared by self-assembly of benzene dicarboxylic acid ligand (H 2 BDC) anchoring Bi source on the surface of Bi 2 WO 6 to form BiMOF, in which WO 3 spherical particles were scattered uniformly. Thereby, an amount of metal and oxygen vacancies (V M + O ) are generated. The 3D flower-like spherical photocatalyst has a large specific surface area and close interfacial contacts, which can provide sufficient channels for carrier migration. The introduction of BiMOF enhanced the light absorption capability of photocatalyst. As a result, the flower-like WO 3 /BiMOF/Bi 2 WO 6 structure exhibits excellent nitrogen fixation as well as high-level photocatalytic activity in degrading Rhodamine B (RhB) and tetracycline (TC) under visible light. For one thing, WO 3 /BiMOF/Bi 2 WO 6 produce ammonia up to 227 μmol L −1 h −1 . For another, the degradation efficacy displayed by RhB 99.3% in 15 min and TC 93.6% degradation in 50 min, respectively. In addition, the catalysts showed excellent cyclic stability, with constant degradation efficiencies for at least 4 cycles. The experimental results of free radical scavenging showed that holes (h + ) and superoxide radical (·O 2− ) were the main active substances in the photodegradation process. Therefore, the photocatalytic mechanism of 3D flower-like WO 3 /BiMOF/Bi 2 WO 6 was also proposed.
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
APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Qiang Zhang,Jinxing Chen,Yunyun Xie,Mozhen Wang,Xuewu Ge
Bi 2 WO 6 has great potential applications in the field of photocatalyst due to its excellent visible-light photocatalytic performance. This work studied the detailed morphological evolution of Bi 2 WO 6 particles synthesized in a simple hydrothermal system induced by the stabilizer poly(vinyl pyrrolidone) (PVP). The XRD and HRTEM results show PVP would not change the crystal structure of Bi 2 WO 6 , but the distribution of PVP on the initially formed Bi 2 WO 6 nanosheets will induce the crystal growth, resulting in a distinct morphology evolution of Bi 2 WO 6 with the increase of the concentration of PVP. At the same time, with the increase of the molecular weight of PVP, the morphology of Bi 2 WO 6 varied from simple sheet-like (S-BWO) to some complicated morphology, such as flower-like (F-BWO), red blood cell-like (B-BWO), and square-pillar-like (SP-BWO). The photocatalytic performances of Bi 2 WO 6 with various morphologies on the decomposition of RhB under visible light irradiation reveal that S-BWO has the best photocatalytic performance, while SP-BWO has the worst. This work not only gives the explanation of the inductive effect of PVP molecular chains on the morphological formation of Bi 2 WO 6 particles, but also provides the controllable way to the preparation of Bi 2 WO 6 with various morphologies taking advantage of the stabilizer PVP.
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 Environmental Chemical Engineering
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2022
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IF 7.968
Xin Zhong,Yuxin Liu,Tao Hou,Yuling Zhu,Baowei Hu
The efficient, safe, low-cost and easy to treatment of uranium(U(VI))-containing wastewater is still an imminent problem. Herein, the hierarchical hollow-spherical bismuth tungstate (Bi 2 WO 6 ) was prepared by hydrothermal method, and sufficiently characterized by morphology and photoelectrochemical properties. In this research, we not only discussed the adsorption performance of U(VI), but also investigated the photocatalytic reduction performance of U(VI), so as to provide technical support for the treatment of U(VI)-containing wastewater in the future. The adsorption procedure complied with the pseudo-second-order model, implying surface complexation or chemisorption . Besides, under visible-light irradiation lasting for 600 min, the photoreduction removal rate of U(VI) was 53% (just adding 2.0 mg Bi 2 WO 6 ), without adding the h + scavenger, due to the harvest absorption of solar energy, hierarchically porous structure and synergic effect of adsorption and photocatalysis . Furthermore, the adsorption mechanism and photocatalytic reduction mechanism of Bi 2 WO 6 for U(VI) were revealed. The metal 3O and O3H bonds in Bi 2 WO 6 crystal were the active coordination sites for U(VI) adsorption, while •O 2 − and e - were the main active species for U(VI) photocatalytic reduction. Although the mechanisms of adsorption and photocatalytic reactions were different, there was a synergistic effect in the process of practical for application removing U(VI) by Bi 2 WO 6 . Consequently, the hierarchical nanosheets-assembled Bi 2 WO 6 microspheres could be considered as a good candidate for visible-light-responsive photocatalyst in radioactive wastewater 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
INORGANIC CHEMISTRY COMMUNICATIONS
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2022
·
IF 3.428
Xiao-hua Zheng,Qi Tang,Hao-wen Zhang,Shi-hui Lu,Fang-er Yang
Bi 2 WO 6 demonstrates the limited photocatalytic activity due to its high photoelectron recombination rate. However, its photocatalytic performance is expected to be improved by forming Step-scheme (S-scheme) heterojunction and SiC is a potential candidate because of its high electron transfer rate in photocatalytic process. In this study, S-scheme heterojunction Bi 2 WO 6 /SiC nanocomposites were synthesized by simple hydrothermal method, and their photo degradation properties for rhodamine B (RhB) under visible light were studied. The results show that silicon carbide nanoparticles have been successfully deposited onto the petal-microsphere shaped Bi 2 WO 6 phase. The nanocomposite with mole ratio of Bi 2 WO 6 to SiC of 1:1 exhibits the highest photo degradation rate as tested in the photocatalytic experiments. The photoreaction rate of the nanocomposite is 3.7 times higher than that of pure Bi 2 WO 6 and 15.5 times higher than that of pure SiC, and the nanocomposite demonstrates good photocatalytic stability.
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
Energies
·
2016
·Vol. 9
·期 10
·764
·
IF 2.077
Yuxue Zhou,Xiangdong Meng,Ling Tong,Xianghua Zeng,Xiaobing Chen
Highly hierarchical hollow bismuth tungstate (Bi2WO6) microspheres self-assembled by thin nanoplates have been fabricated via a facile template-free solvothermal route. The possible growth pattern and formation mechanism of hierarchical hollow Bi2WO6microspheres was investigated. The excellent visible-light-driven photocatalytic performance on rhodamine B (RhB) degradation was displayed by hierarchical hollow Bi2WO6microspheres. Such well-organized hierarchical hollow Bi2WO6microspheres show potential application in water treatment fields by full use of solar energy.Keywords:bismuth tungstate (Bi2WO6);semiconductor photocatalyst;visible-light-driven;water treatment
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 10
·13382-13395
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IF 2.478
Yang Lin,Xin Yanmei,Yao Congfei,Miao Yuqing
As an organic–inorganic hybrid material, metal organic frameworks (MOFs) has a great development prospect in the field of photocatalysis. Herein, the in situ growth of Bi-based MOF (CAU-17) on Bi 2 WO 6 was utilized to obtain Bi 2 WO 6 /CAU-17 photocatalyst by a simple solvothermal transformation method. Bi 2 WO 6 can be used both as template and Bi source. The structure and morphology of Bi 2 WO 6 /CAU-17 composites were characterized by X-ray diffraction patterns, X-ray photoelectron spectroscopy, Fourier transform infrared spectra, UV–vis diffuse reflectance absorption spectra and scanning electronic microscopy, and transmission electron microscope. The results showed Bi 2 WO 6 /CAU-17 composites were successfully constructed by growing CAU-17 in situ on Bi 2 WO 6 . Compared with pure Bi 2 WO 6 and CAU-17, Bi 2 WO 6 /CAU-17-1 h composite exhibited excellent photocatalytic activity for the degradation of Rhodamine B, and its rate constant was 0.02083 min −1 . In addition, the quantum yield and space time yield of the obtained photocatalyst were 2.56 × 10 −6 molecules/photon and 1.28 × 10 −7 molecules/photon·mg, respectively. Bi 2 WO 6 /CAU-17 also exhibits better values of the modified FOM (figure of merit). This method provides a potential opportunity for the development of in situ growth of similar MOF materials for water treatment and other possible applications in the future.
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
NANO
·
2014
·
IF 1.26
SHAOFANG SUN,YAFAN WU,XIAN ZHANG,ZHONGJIE ZHANG,YAN YAN,WEISHENG GUAN
The removal of CIP from the environment has become a mandatory issue. In our paper, we have realized the visible-light-driven degradation of CIP on the BiVO 4 – Bi 2 WO 6 nano-heterojunction photocatalysts. The synthesized photocatalysts were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible (UV-Vis) absorption spectra and photoluminescence (PL) spectra. Compared with the single-phase BiVO 4 and Bi 2 WO 6 counterparts, BiVO 4 – Bi 2 WO 6 nano-heterojunction photocatalysts show enhanced photocatalytic degradation activities in visible-light-driven CIP degradation. Particularly, when R ( Bi 2 WO 6 ∕ BiVO 4 ) = 10 wt .%, the products exhibit the highest CIP degradation ratio in 60 min of 76.8% under visible light illumination. The tentative mechanism of the interface charge transfer (IFCT) effect in the BiVO 4 – Bi 2 WO 6 heterojunction structure is also discussed by using the band position calculation.
研究领域:
环境科学
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材料科学
·
光催化技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Xufang Qian,Dongting Yue,Zheyi Tian,Meng Reng,Yao Zhu,Miao Kan,Taiyang Zhang,Yixin Zhao
We incorporated highly stable carbon quantum dots (CQDs) with Bi 2 WO 6 to sufficiently photocatalytic removal of gaseous volatile organic compounds (VOCs) utilize solar energy. With the facile decoration of CQDs, the composite photocatalysts of CQDs/Bi 2 WO 6 extend the absorption into visible light region and improve the photoexcited charge separation in comparison with pristine Bi 2 WO 6 . The CQDs/Bi 2 WO 6 exhibited higher photocatalytic oxidation activities towards acetone and toluene under both UV–vis and visible light irradiation. In all, CQDs could be a promising candidate for visible light photocatalysts due to their superior ability to extend the visible absorption and suppress the photo-excited charge recombination.
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
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