Journal of the Taiwan Institute of Chemical Engineers
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2017
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IF 4.217
Junlei Zhang,Zhen Ma
Novel Ag 3 VO 4 /Bi 2 WO 6 heterojunctions were developed by in situ growing Ag 3 VO 4 particles onto Bi 2 WO 6 nanosheets. Ag 3 VO 4 /Bi 2 WO 6 heterojunction with an optimal Bi 2 WO 6 /Ag 3 VO 4 mass ratio of 10% exhibited much higher activity in the photocatalytic degradation of aqueous dyes and tetracycline hydrochloride under visible light ( λ > 400 nm) irradiation than Ag 3 VO 4 , Bi 2 WO 6 , or a mechanical mixture of Bi 2 WO 6 and Ag 3 VO 4 . The heterojunction catalyst also had good recyclability. The upgraded photocatalytic activity is attributed to the formation of nanojunction between Ag 3 VO 4 and Bi 2 WO 6 . Photogenerated holes and superoxide radical anion are mainly responsible for the photocatalytic activity.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Feng He,Junhuan Tang,Qianxiang Xiao,Wen He,Qixu Chen,Ziyang Chang,Chongkun Zhao,Kai Liu,Hongqing Wang
In uranium(VI) (U(VI)) photoreduction, it is still a challenge to simultaneously degrade naturally coexisting organics and explore their impact on U(VI) photoreduction. Meanwhile, how to boost the separation and transport capability of photo-induced carriers is also a hot topic of current research. In this work, an ultrathin Bi 2 WO 6 /Bi 2 MoO 6 Z-type heterojunction was developed for the simultaneous treatment of U(VI) and its co-existing organics (tannic acid (TA)). Ultrathin interface engineering increased the contact area and shortened the transmission distance of photo-induced carriers. As a result, ultrathin Bi 2 WO 6 /Bi 2 MoO 6 exhibited highly efficient U(VI) removal rate (95.8 %) and TA degradation rate (97.2 %), which were much higher than those of bulk Bi 2 WO 6 /Bi 2 MoO 6 and single ultrathin Bi 2 WO 6 . In addition, the material possessed excellent stability and recyclability. Importantly, TA not only enhanced U(VI) removal by eliminating holes, but also favored U(VI) removal by serving as a bridge to the catalyst for U(VI) adsorption. Finally, a new mechanism 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
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Feiran Jia,Qing Liu,Liyan Xie,Zhishan Luo,Jianhui Huang,Yingying He,Lirong Qiu
The use of heterojunctions with Z-scheme photocatalysts holds great promise for enhancing the photocatalytic degradation efficiency of antibiotics. In this study, we report the construction of a novel heterostructure by in-situ growth of the ultrathin polymeric carbon nitride (PCN) on the electrospun Bi 2 WO 6 nanofibers for improved photocatalytic tetracycline (TC) degradation under visible light. Our gas–solid reaction strategy enables the formation of uniform and intimate junctions between the PCN nanosheets and the Bi 2 WO 6 nanofibers, resulting in a well-contacted interface that remarkably accelerates the separation and transfer of the photogenerated charge carriers. The optimized PCN/Bi 2 WO 6 photocatalyst exhibits a significant TC degradation rate of 89.5 % under visible light, which is 1.4-fold and 2.0-fold of the pure PCN and Bi 2 WO 6 photocatalysts, respectively. Our innovative design philosophy opens up a new horizon for the development of efficient Z-scheme heterostructured photocatalysts for antibiotic degradation.
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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2024
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IF 20.2
Bo Liu,Miao Cheng,Chunyang Zhang,Yitao Si,Jiancheng Zhou,Yuqi Ren,Jie Guan,Lunbo Duan,Maochang Liu,Dengwei Jing,Naixu Li
CO 2 photoreduction into high-value-added C 2+ products struggles with energetic challenges in forming critical intermediates and multiple C−C bonds. Herein, an effectively synthesized photocatalyst , Bi 2 WO 6 nanosheets with oxygen vacancies anchoring Au and Cu dual single atoms on the surface, can convert CO 2 and H 2 O vapour into C 3 H 6 and C 2 H 4 . The high product selectivity of 18.2 % for C 3 H 6 and 65.4 % for total C 2+ hydrocarbons are achieved under concentrated light irradiation (2.4 W·cm −2 ). Au-Cu dual-single-atom sites and defect engineering strategies exhibit synergistic effects on optimizing the reaction thermodynamics and charge kinetics for CO 2 conversion. Theoretical calculations provide reference values for reaction pathways of C 3 H 6 and C 2 H 4 formation, with the C−C couplings being potential determining steps of multicarbon product formation. Our work offers a promising strategy with a combination of concentrated light irradiation technology and catalyst modification to achieve high selectivity of C 2+ products.
研究领域:
材料科学
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催化化学
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环境科学
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2021
·Vol. 47
·期 6
·2297-2310
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IF 2.914
Song Yupeng,Zhou Feng,Chai Yongheng,Zhan Su
Marine pollution has become ever more serious, and photocatalysts have potential prospects in the application of marine anti-pollution. The RGO/Bi 2 WO 6 composite with the microsphere structure was synthesized by the hydrothermal method. The results showed that the sterilization rate of 2% RGO/Bi 2 WO 6 coating increased to more than 93% under visible light. The high performance was attributed to the improvement of the charge separation efficiency and the enhancement of the utilization rate of light. The formation mechanism of microspheres was discussed. Radical capture experiments proved that hydroxyl radical was the major active substance. Photocurrent and EIS experiments indicated that 2%RGO/Bi 2 WO 6 had excellent carrier separation efficiency.
研究领域:
环境科学
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材料科学
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海洋生物学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 8
·3745-3757
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IF 3.3
Litao Jia,Pei Yu,Ying Dong,Yonglei Xing,Juan Peng,Gang Ni,Xiaoyong Jin
The decomposition efficiency of refractory organic pollutants depends strongly on the characteristics of the photoanode semiconductors in the photoelectrocatalytic (PEC) process. The selection of superior materials with excellent PEC efficiency is a challenge in the practical application of PEC oxidation technology. Herein, a novel S-Co3O4/Bi2WO6 heterojunction photoanode was fabricated using a simple hydrothermal procedure. Compared with Bi2WO6 nanoflowers, the as-prepared S-Co3O4/Bi2WO6 photoanode had a large electroactive surface area, low charge transfer resistance, strong light absorption ability, and high separation efficiency for induced photogenerated electron/hole pairs (e−/h+). This relies on the fact that S doping not only controls the morphology of Co3O4 but also changes its intrinsic electronic structure to improve the interlayer polarization. Notably, the Z-scheme heterojunction formed by the combination of S-Co3O4 and Bi2WO6 not only enhances the e−/h+ separation efficiency but also results in a stronger redox ability than that of pure Bi2WO6. In addition, reactive species trapping experiments and electron spin resonance tests demonstrated that the S-Co3O4/Bi2WO6 photoanode plays a dominant role in the degradation of tetracycline (TC) by ˙O2− and ˙OH radicals. Therefore, the prepared S-Co3O4/Bi2WO6 photoanode exhibits better PEC performance than Co3O4, S-Co3O4 and Bi2WO6 in the degradation of TC. The optimized S-Co3O4/Bi2WO6 composite showed a degradation rate of 87.4% in 30 mg L−1 TC solution. This work provides a new strategy for the construction of efficient photoelectroanodes.
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
CERAMICS INTERNATIONAL
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2018
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IF 3.057
Yao Feng,Shuyi Lai,Le Yang,Ralf Riedel,Zhaoju Yu
Polymer-derived porous Bi 2 WO 6 /SiC(O) nanocomposites were prepared by a simple mechanical mixing of Bi 2 WO 6 nanopowders with a polyorganocarbosilane, namely allylhydridopolycarbosilane (AHPCS), followed by pyrolysis of the resulting blend at 700 °C for 2 h. The Bi 2 WO 6 nanopowders were synthesized by the reaction between Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 and characterized by means of X-ray diffraction (XRD) and dynamic light scattering (DLS). The cross-linking and polymer-to-ceramic transformation of the physically blended Bi 2 WO 6 /AHPCS were determined by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). TEM studies revealed that the final ceramic composite is comprised of Bi 2 WO 6 nanoparticles homogeneously embedded in a polymer-derived SiC(O) matrix. Nitrogen sorption isothermal analysis showed the meso-macroporous feature of resultant Bi 2 WO 6 /SiC(O) nanocomposites. Finally, the porous Bi 2 WO 6 /SiC(O) composites show a high photodegradation efficiency (ca. 90%) towards a model organic dye Rhodamine B (RhB) under UV irradiation. Therefore, the synthesized ceramic composite has to be considered as a promising candidate material for purification of water contaminated with organic dyes.
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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2021
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IF 4.539
Guangyu Wu,Qi Liu,Jingyi Wang,Yujing Zhang,Chengmin Yu,Huiyang Bian,Mohammad Hegazy,Jiangang Han,Weinan Xing
In recent years, biochar has attracted extensive attention in improving the activity of photocatalysts . The surface functional groups of biochar could accelerate the electron transfer in the process of photocatalytic performance. Herein, in this work, different proportions of Bi 2 WO 6 /biochar (BW/BC) photocatalytic composites were prepared using a simple hydrothermal method and applied for removing of Rhedamine B (RhB) under visible light irradiation. Moreover, the morphology and structure of the as-prepared photocatalytic composites were characterized by XRD , SEM, TEM , XPS , UV–vis DRS, the transient photocurrent response and PL spectra . The results showed that photocatalytic composites with flower-like 3D hierarchical superstructures containing the plentiful nanosheets were obtained, which could rapid interfacial charge transfer and efficiently separate electron-hole pairs, and thereby significantly enhanced charge carrier separation and the photocatalytic activity . It was found that BW/BC-5 has the highest photo-catalytic activity and more than 94.9% of the RhB solution were degraded. Furthermore, the kinetic rate of BW/BC-5 composite photocatalyst was 5.27 times more than the pure BW. The •O 2 − part played a huge role in the process of photocatalytic reaction. The mechanism of enhanced photocatalytic activity for BW/BC composite was showed. The result indicated that construction of photocatalytic composites combining Bi 2 WO 6 semiconductor and biochar conductive carbon material is a high efficient way to increase the photocatalytic activity for environmental protection.
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
ENERGY & FUELS
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2022
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IF 4.654
Wei Zhang,Jie Zhao,Ahmed A. Allam,Yue Xin,Jingqi Lin,Ting Gao,Jamaan S. Ajarem,Ximing Li,Chuanyi Wang,Detlef W. Bahnemann
Bi2WO6 is a promising photocatalyst for NOx removal, owing to its wide solar light absorption and specific photoelectric properties. Nevertheless, enhancing its efficiency remains a major concern. Palladium proves to be a good co-catalyst for semiconductor materials, but how the combination of Pd and bismuth tungstate affects the efficiency of NO removal and relevant process is still vague. In this work, nutshell-like bismuth tungstate was synthesized using a hydrothermal method, followed by photo-depositing Pd nanoparticles with different contents. The obtained photocatalysts were characterized by X-ray diffraction, specific surface area analyzer (BET), X-ray photoelectron spectroscopy, and scanning electron microscopy. Among the prepared photocatalysts, Bi2WO6 deposited with 1 wt % Pd shows the best photocatalytic activity with a NO removal efficiency of 58%, which is 2.9 times that of the Bi2WO6 under the same conditions. The enhanced photocatalytic activities were attributed to the comprehensive effects of the high efficiency in separating electrons and holes, improvement in invisible light utilization and BET specific surface areas of Pd–Bi2WO6 nanocomposites. More importantly, it was found that NO2 is the main product over Bi2WO6, whereas the conversion of NO to NO3– (an environmentally friendly product) is dominant over Pd-modified Bi2WO6 due to the enhanced separation of electrons and holes. Active species capture experiments show that photo-generated holes (h+) and •O2– play an important role in NO removal. The present work provides new insights into the role of Pd cocatalysts in NO removal.
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
·
2024
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IF 4.7
Huiming Zhang,He Bian,Fang Wang,Yaping Li,Lijun Zhu,Daohong Xia
Photocatalytic CO 2 reduction is a practical solution to the energy dilemma and environmental damage caused by greenhouse gases, and it is very important to explore high-efficiency photocatalysts. In this study, a novel Bi 2 WO 6 /C 3 N 5 step(S)-scheme heterojunction was successfully constructed and applied for CO 2 photoreduction. The 2D/2D structure showed excellent photocatalytic properties, with methane production reaching 1.976 μmol·g −1 ·h −1 and selectivity reaching 100 % under 5 hours of visible light irradiation. The result indicates that combining Bi 2 WO 6 and C 3 N 5 can promote interfacial charge separation and maintain the optimal reducing ability of photogenerated electrons. Based on experimental and theoretical calculations, we characterized the reaction mechanism and heterojunction formation mechanism. This study offers a novel approach to improve the selectivity and photocatalytic efficiency of CO 2 reduction products.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Shihao Xiong,Tao Peng,Liangliang Huang,Rui wang,Beibei He,Jun Jin,Huanwen Wang,Yansheng Gong
Semiconductor photocatalytic nitrogen reduction reaction (PNRR) stands as a promising clean technique for ammonia synthesis, yet it confronts numerous challenges. In this study, Ag nanoparticle-modified Cu-doped Bi 2 WO 6 (ACB) porous composite materials with varying mass percentages were successfully synthesized using a solvothermal reduction approach. The incorporation of transition metal Cu effectively modulates the energy band position of Bi 2 WO 6 . Furthermore, the introduction of Ag nanoparticles significantly suppresses the recombination of photogenerated carriers. Without adding sacrificial agent, the photocatalytic nitrogen fixation yield of ACB reaches an impressive 184.93 μmol·g −1 ·h −1 , which is 5.44 times higher than that of pristine Bi 2 WO 6 . A comprehensive analysis of the experimental results reveals that the combined effect of Cu doping and Ag nanoparticle loading endows ACB with an increased exposure of active sites, thereby significantly enhancing its photocatalytic nitrogen fixation performance. This research offers a promising approach for the design of metal nanoparticle-supported catalysts for PNRR, holding significant implications for the advancement of other material systems.
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
ACS Applied Nano Materials
·
2022
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IF 6.14
Zhenying Jiang,Xianjun Tan,Jingyi Xu,Yuxiong Huang
The internal electric field induced by a piezoelectric effect is a promising method to suppress rapid electron–hole recombination of photocatalysis for environmental remediation. Herein, we fully utilized both piezoelectric and photocatalytic properties of Bi2WO6 nanoplates for the removal of organic pollutants. The degradation rate constant of piezo-photocatalysis is dramatically boosted to 0.077 min–1 by the Bi2WO6 nanoplates, which is 4.2-fold of the photocatalysis alone. The superior catalytic activity of Bi2WO6 nanoplates was attributed to the accelerated electron–hole pair separation efficiency associated with the enhancement of the piezoelectric effect-induced internal electric field. Based on the theoretical calculation, the bandgap of Bi2WO6 nanoplates would decrease from 1.99 to 1.67 eV under mechanical strains, indicating that broader light harvesting and faster charge transfer can be achieved with the assistance of the piezoelectric field. Accordingly, multiple reactive oxygen species (·O2– and ·OH) are dominant for the degradation activity based on the quenching experiments and EPR analysis, outperforming piezocatalysis and photocatalysis. We have provided a new strategy to improve the catalytic decontamination performance.
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
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