JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Cheng Cheng,Dongyun Chen,Najun Li,Hua Li,Qingfeng Xu,Jinhui He,Jianmei Lu
Semiconductor materials have been used for photocatalytic degradation since they were discovered to be useful for photocatalytic degradation. Many studies have been researched to improve the efficiency of photocatalytic degradation. Among them, the introduction of vacancies to improve the photocatalytic efficiency has been verified to be a more feasible method. In this study, we combined two-dimensional (2D) graphite carbon nitride (g-C 3 N 4 ) nanosheets with oxygen-containing vacancy zero-dimensional (0D) Bi 2 WO 6 (BWO-OV) quantum dots to prepare 2D-0D g-C 3 N 4 /Bi 2 WO 6 -OV composite catalyst. The use of Bi 2 WO 6 containing oxygen vacancies enhanced the absorption of light and increased the generation of photogenerated carriers. In addition, the formation of heterojunction and the vacancy structure of Bi 2 WO 6 promote the life of photogenerated carriers and improve the catalytic effect of the catalyst. This structure shows high efficiency in removing low concentration (0.5 ppm) of nitric oxide (NO) at room temperature. The efficiency of the composite catalyst is much higher than g-C 3 N 4 or BWO-OV, and better than the composite g-C 3 N 4 /Bi 2 WO 6 without oxygen vacancies. When applied to NO removal, the composite g-C 3 N 4 /Bi 2 WO 6 -OV-10 showed the best catalytic activity which was up to 61.2%. At the same time, five cycles of experiments show that the material has excellent stability.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Binpeng Zhang,Dan Liu,Panhui Zhang,Yuebin Xi,Tianjin Li,Kai Chen,Yanmin Shen,Wenju Liu,Yunhui Feng,Huan Wang
Application of Bi 2 WO 6 (BWO) as a photocatalyst for organic wastewater treatment is limited by low removal efficiency. Porous carbon is often used to coupling with BWO for improving its removal efficiency. In our study, we found that the porous structure of carbonaceous substrates is very important for their modification properties. We examined the effect of carbonaceous substrates with different pore structures as a carrier on dye removal performance. The results showed that the interconnected porous structure was more effective for coupling with BWO than hierarchical porous, micro–mesoporous, and microporous structures. This structure facilitated uniform BWO loading owing to low mass transfer and was not prone to blockage after loading. The obtained BWO/lignin-derived interconnected porous carbon (BWO/LIPC) composite presented efficient contaminant removal via synergistic adsorption and photocatalysis. After 3 h of light exposure, BWO/LIPC-5 % exhibited a 96.5 % removal efficiency for Rhodamine B (initial concentration of 40 mg·L −1 ), with a removal rate 6.3 times that of pure BWO. After five use cycles, the removal efficiency remained above 90 %. The introduction of LIPC increased BWO adsorption performance. Dye molecules were concentrated on the BWO/LIPC surface, thus optimizing photocatalytic efficiency. Moreover, photoelectrochemical characterization revealed that LIPC served as an electron acceptor, effectively inhibiting the recombination of photogenerated electron–hole pairs in BWO and enhancing its photocatalytic activity. This dye removal strategy involving synergistic adsorption and photocatalysis provides valuable insights for developing efficient materials in wastewater remediation.
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 HAZARDOUS MATERIALS
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2020
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IF 9.038
Xin Gao,Jing Niu,Yifei Wang,Yun Ji,Yanlin Zhang
Environmental-friendly solar photocatalytic technology is attracting great attention in the field of pollution control. In this work, novel PO 4 3− -Bi 2 WO 6 /PI photocatalyst achieved high degradation efficiency for tetracycline degradation in simulated solar light (1.6 times kinetic constants of Bi 2 WO 6 ). The photocatalyst could produce more oxygen vacancies as well as more active species O 2 − and OH, and exhibited high mineralization ability, good stability and recyclability simultaneously. After 4 cycles of degradation experiments, its degradation efficiency was only reduced by 8.6 %. Tetracycline molecules gradually became small molecules under the attack of active species. The tetracycline degradation was highly pH-dependent and enhanced with the increase of solution pH. The water quality parameters humic acid and Cl − presented the inhibitory effect, while HCO 3 − can accelerate the tetracycline degradation. The degradation of tetracycline by PO 4 3− -Bi 2 WO 6 /PI conformed to the Z-scheme photocatalysis mechanism, which could effectively broaden the absorption of solar light, improve the separation and transfer of photogenerated electron-hole pairs and extend the lifespan of the photocatalyst.
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 Environmental Chemical Engineering
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2024
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IF 7.4
Kang Li,Jiaoqun Zhu,Weibing Zhou,Lilong Sun,Shouqin Tian
To improve the photocatalytic performance of single-phase Bi 2 WO 6 , the heterojunction construction is usually employed to effectively separate and transport photo-induced carriers. Herein, MXene/Bi 2 WO 6 heterojunction (NB2 and VB2) with face-to-face contact and hierarchical structure was constructed by growing ultrafine Bi 2 WO 6 nanosheets on the surface of two-dimensional MXene (Nb 2 C and V 2 C) materials. Compared with the original Bi 2 WO 6 , the hybrids exhibited a larger specific surface area (42.17 m 2 ∙g −1 for NB2, 50.15 m 2 ∙g −1 for VB2), and displayed significant enhancements in the photodegradation of anionic MO (13.8-fold, 6.5-fold), cationic RhB (9.1-fold, 4.5-fold), and neutral phenol (8.5-fold, 6.1-fold), respectively. This is mainly attributed to the heterostructures via face-to-face coupling which can facilitate the tuning of the photoresponsive properties and internal energy level structure, as well as the generation of free radicals ( • O 2 - , • OH, and h + ) for the stepwise redox process in photodegradation. Therefore, this work is expected to expand the diverse use of Non-Ti 3 C 2 MXene in photocatalysis, meanwhile provide important guidance for the harmless treatment of organic pollutants.
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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产品关联
DOI
高影响因子
Catalysis Science & Technology
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2021
·Vol. 11
·期 18
·6271-6280
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IF 6.119
Jiaqi Dong,Jianqiang Hu,Anyu Liu,Jiale He,Qingling Huang,Yanru Zeng,Wenjing Gao,Zhen Yang,Yongcai Zhang,Yong Zhou,Zhigang Zou
Direct Z-scheme MgIn2S4/Bi2WO6 hierarchical heterostructures were simply fabricated via immobilising MgIn2S4 nanoflakes onto the surface of Bi2WO6 hierarchical nanosheet-like structures towards photocatalytic reduction of Cr(VI). The analyses of the energy band structure, UPS tests and DMPO-ESR spin-trap experiments confirm that the intimate MgIn2S4/Bi2WO6 heterointerface allows an efficient Z-scheme interfacial charge migration route between MgIn2S4 and Bi2WO6, leading to higher redox ability of photoexcited carriers, and thus favours the separation of photoexcited carriers, proved by the results of PL spectroscopy, photoluminescence decay traces, transient photocurrent densities and EIS. In addition, the MgIn2S4/Bi2WO6 heterostructures also exhibit obviously enhanced ultraviolet-visible-light absorption according to UV-vis DRS analysis, and can generate more electron–hole pairs under UV-visible light illumination, effectively improving the photocatalytic activity. Therefore, because of their synergistic effects, all the MgIn2S4/Bi2WO6 hierarchical heterostructures show distinctly improved photoreduction activities for Cr(VI), compared with pure Bi2WO6. The optimal hybrid (MIS/BWO-0.35) displays nearly 100% Cr(VI) reduction into Cr(III) after 40 min of simulated sunlight illumination, which is better than the majority of the reported Bi2WO6 and other semiconductor photocatalysts before. Its reaction rate constant for the photoreduction of Cr(VI) (0.1063 min−1) is about 4.5 times higher than that of the pristine Bi2WO6 (0.0237 min−1). This work provides a valid approach for developing efficient Z-scheme photocatalytic materials in removing Cr(VI).
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
RSC Advances
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2017
·Vol. 7
·期 43
·26943-26951
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IF 3.108
Huajun Zheng,Ping Niu,Zhefei Zhao
Carbon quantum dot sensitized Pt@Bi2WO6/FTO electrodes (simplified as CQDs-Pt@Bi2WO6/FTO) were successfully prepared by loading platinum particles onto Bi2WO6 nanoplates via a photo-deposition method and sensitized carbon quantum dots (CQDs) via a dip-coating method. The photoelectro-catalytic properties of the Pt@Bi2WO6/FTO and CQDs-Pt@Bi2WO6/FTO electrodes for methanol oxidation were investigated. The results indicated that the CQDs-Pt@Bi2WO6/FTO electrode shows higher photoelectro-catalytic activity and better stability than that of the Pt@Bi2WO6/FTO electrode. The higher photoelectro-catalytic performance for methanol oxidation was attributed due to the special synergetic effects between the photocatalytic and electrocatalytic process under solar light irradiation. More importantly, the introduction of CQDs broaden the photoresponse range of the Bi2WO6 material and improves the mobility of the photocarriers. Meanwhile, the doped CQDs act as preferential adsorption sites for the intermediate carbonaceous species during methanol oxidation. This not only alleviates CO poisoning towards the Pt particles, but also improves the efficiency of methanol oxidation by constructing a new type of CQDs-Pt electrocatalyst. The composite material, which combines the dual function of photocatalysis and electrocatalysis will be a promising candidate for new photoelectro-catalytic fuel cells.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
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2022
·Vol. 37
·期 21
·3761-3772
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IF 2.909
Chen Junnan,Lin Wensong,Mai Xin,Yang Qian
In this work, the flower-like hierarchical Bi 2 WO 6 decorated with nano UiO-NH 2 -66 was fabricated by a two-step solvothermal method. The structure, composition, and morphology of the composites were characterized by XRD, FTIR, XPS, BET, and SEM. The photoelectrochemical properties of the composites were analyzed by transient photocurrent response, DRS, and PL spectra. It is found that hole (·h + ) plays a dominant role, and the hydroxyl radical (·OH) and superoxide radical (·O 2 − ) play a secondary role in the catalytic system after free radical trapping experiments. The results of electron spin resonance spin-trapping tests also confirm the mechanism. Compared with pure Bi 2 WO 6 or pure UiO-NH 2 -66, Bi 2 WO 6 /UiO-NH 2 -66 composites have much higher decomposition effectiveness of Rhodamine B under the same conditions. Furthermore, Bi 2 WO 6 /UiO-NH 2 -66 photocatalyst with 7 wt% of UiO-NH 2 -66 (denoted as BWO/UNH-7) kept the stable catalytic performance after five recycles, which may be used as a good photocatalyst for degrading organic matter in sewage. Graphical abstract
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 Advanced Ceramics
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2021
·Vol. 10
·期 2
·355-367
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IF 6.707
Yang Weiyi,Chen Yan,Gao Shuang,Sang Licheng,Tao Ruoge,Sun Caixia,Shang Jian Ku,Li Qi
Photocatalysts with the photocatalytic “memory” effect could resolve the intrinsic activity loss of traditional photocatalysts when the light illumination is turned off. Due to the dual requirements of light absorption and energy storage/release functions, most previously reported photocatalysts with the photocatalytic “memory” effect were composite photocatalysts of two phase components, which may lose their performance due to gradually deteriorated interface conditions during their applications. In this work, a simple solvothermal process was developed to synthesize Bi 2 WO 6 microspheres constructed by aggregated nanoflakes. The pure phase Bi 2 WO 6 was found to possess the photocatalytic “memory” effect through the trapping and release of photogenerated electrons by the reversible chemical state change of W component in the (WO 4 ) 2− layers. When the illumination was switched off, Bi 2 WO 6 microspheres continuously produced H 2 O 2 in the dark as those trapped photogenerated electrons were gradually released to react with O 2 through the two-electron O 2 reduction process, resulting in the continuous disinfection of Escherichia coli bacteria in the dark through the photocatalytic “memory” effect. No deterioration of their cycling H 2 O 2 production performance in the dark was observed, which verified their stable photocatalytic “memory” effect.
研究领域:
材料科学
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环境科学
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微生物学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jinghang Chen,Yaqiang Wu,Zihao Cui,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Xin Li,Shukui Shi,Baibiao Huang,Peng Wang
The carbonyl compounds synthesized from benzyl alcohol by selective photocatalysis have a wide range of applications in the chemical, pharmaceutical and food industries, while the fine chemical synthesis remains challenged by inefficient carrier separation and inadequate redox potential control in conventional semiconductor systems. The stability and eco-friendly attribute of lead-free bismuth halide perovskites emerge as promising photocatalysts for practical applications. Herein, we design and synthesize a Z-scheme heterojunction between Cs 3 Bi 2 Br 9 and Bi 2 WO 6 by an anti-solvent method. The optimized Cs 3 Bi 2 Br 9 /Bi 2 WO 6 composite demonstrates enhanced photocatalytic performance for benzyl alcohol oxidation, achieving 95 % conversion efficiency with 99 % benzaldehyde selectivity under AM 1.5G irradiation. Systematic in situ characterizations, including electron spin resonance, X-ray photoelectron spectroscopy and diffuse reflectance infrared Fourier-transform spectroscopy, evidence the Z-scheme charge transfer mechanism in Cs 3 Bi 2 Br 9 /Bi 2 WO 6 , track key intermediates during the oxidation pathway, and mechanistically identify superoxide radicals (• O 2 - ) as the predominant active species. This study not only advances the understanding of photocatalytic mechanisms in Z-scheme organic transformations but also provides a foundational framework for the design of efficient photocatalytic systems.
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
CERAMICS INTERNATIONAL
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2019
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IF 3.45
Wei Liang,Jianhai Pan,Xiangjie Duan,Hua Tang,Jing Xu,Guogang Tang
Novel Biomass carbon modified Bi 2 WO 6 with 3D flower-like nanostructures were firstly fabricated through a hybridization approach, and investigated by multiple techniques including XRD , XPS, SEM and TEM analysis, etc. Compared with the pristine Bi 2 WO 6 , Bi 2 WO 6 /C hybrids exhibit higher visible-light photocatalytic activity and stability for tetracycline (TC) photodegradation. Moreover, the obviously enhanced photodegradation performance of Bi 2 WO 6 /C hybrids was mainly attributed to the modification of biomass carbon with good natures in specific surface area, narrow band gap (2.51 eV) and electronic transmission, which greatly improved the adsorption capacity and facilitated the separation of charge carriers. Furthermore, a possible photocatalytic mechanism of Bi 2 WO 6 /C hybrids in the view of active radicals has been discussed, which was also ascribed to the outstanding degraded ability of the ·OH evolved from the supersaturated ·O 2 − through trapping and ESR experiments. More importantly, these findings provide new insights to the utilization of biomass carbon modified other Bi-based photocatalysts and enhancing the photocatalytic performance to address environmental problems.
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
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Meiying Yang,Tingting Xu,Xueqing Jin,Qi Shen,Chunyan Sun
C Br bond activation is a critical step in the degradation of organic halogenated pollutants. Herein, by introducing oxygen vacancies with different concentration gradients into Bi 2 WO 6 , the CBr bond in decabromodiphenyl ether (BDE209) is activated, so that BDE209 is successfully dehalogenated under visible light. The study shows that the degradation rate of BDE209 on Bi 2 WO 6 is determined by both interface defects and crystallinity. Good crystallinity is conducive to the generation and separation of photogenerated electrons and holes, and an appropriate defect concentration can promote the C-Br activation of BDE209. In addition, through the tracking analysis of the degradation products of BDE209, the content of the meta -debromination products of BDE209 on Bi 2 WO 6 is significantly higher than that of the ortho- and para- debromination products, indicating that the reduction reaction is a position selective multi-electron mechanism. The study shows that oxygen vacancy assisted debromination is an excellent strategy for photocatalytic treatment of halogenated flame retardant pollutants.
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 CATALYSIS
·
2018
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IF 6.759
Renshan Wang,Benxia Li,Yi Xiao,Xueqin Tao,Xintai Su,Xiaoping Dong
Ultrathin semiconductor nanosheets decorated with metallic nanoparticles (NPs) are promising in photocatalysis due to the multi-component interactions. The materials with a series of monometallic Pd and bimetallic Au-Pd NPs anchored on Bi 2 WO 6 ultrathin nanosheets were synthesized and developed as photocatalysts for selective oxidation of aromatic alcohols to aromatic aldehyde. By optimizing the metallic contents, a typical sample of Au(0.25)Pd(0.25)-Bi 2 WO 6 exhibited the highest photocatalytic activity among all the prepared photocatalysts including Au(0.5)-Bi 2 WO 6 , Pd( x )-Bi 2 WO 6 , Au( x )Pd( x )-Bi 2 WO 6 ( x represents the weight percentage of metal in the photocatalyst), along with the improved selectivity for producing benzaldehyde. The extended absorption in visible range, higher efficiency for the transfer and separation of photogenerated charge carriers, and the superior ability for generating active radicals of Au(0.25)Pd(0.25)-Bi 2 WO 6 were demonstrated by DRS spectra, photoelectrochemical measurements, and ESR detection. The effect of the active species for selective oxidation of aromatic alcohols was proved to follow the order of h + + O 2 − > h + >> O 2 − . Accordingly, a possible mechanism based on the interfacial cooperation between bimetallic Au-Pd NPs and Bi 2 WO 6 ultrathin nanosheets was proposed to illustrate the photocatalytic process, where the holes accumulated in Bi 2 WO 6 ultrathin nanosheets and O 2 − produced on metallic NPs synergistically promote the selective oxidation of aromatic alcohols.
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
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