Desalination and Water Treatment
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2024
·
IF 1
Wen An,Shaomang Wang,Yang Fu,Yuan Guan,Zhongyu Li,Tao Xu,Haoran Wang
Bi 2 WO 6 nanosheets with gradient oxygen vacancies were synthesized by acetic acid solvothermal and subsequent calcination. The photocatalytic activity of the calcined Bi 2 WO 6 was significantly enhanced. The calcination regulated the oxygen vacancy in Bi 2 WO 6 . Oxygen vacancy defects helped to adjust the band structure and change the surface chemical state. At the same time, the electrons were the main charge carriers of the n-type semiconductor Bi 2 WO 6 . Part of the electrons was captured by the oxygen vacancies to promote the separation of the holes. Some of the electrons reacted with oxygen to generate • O 2 – . The h + and • O 2 – were the main active species that degraded rhodamine B. Among them, Bi 2 WO 6 with 1 h of calcination at 315°C (Bi 2 WO 6 -315°C 1 h) exhibited the optimal photocatalytic activity. The degradation velocity of rhodamine B over Bi 2 WO 6 was 21.4 times that of Bi 2 WO 6 under the same reaction condition.
研究领域:
材料科学
·
化学
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DOI
高影响因子
MOLECULES
·
2017
·Vol. 22
·期 5
·859
·
IF 2.861
Yuxue Zhou,Pengfei Lv,Xiangdong Meng,Yanping Tang,Pingping Huang,Xiaobing Chen,Xiaoshuang Shen,Xianghua Zeng
Two-dimensional thin Bi2WO6nanoplates have been fabricated using a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method. We investigated the proposed formation mechanism based on the crystalline structures of the thin Bi2WO6nanoplates. The high adsorption ability and excellent visible-light driven photocatalytic activities of the Bi2WO6nanoplates were illustrated, in view of exposed (001) facets of nanoplates possessing faster separation of photo-generated charge carriers and increased catalytically active sites. Such a cost-effective way to obtain Bi2WO6nanoplates offers new possibilities for the design of adsorptive semiconductor photocatalysts with strengthened photocatalytic activities.Keywords:Bi2WO6nanoplates;semiconductor photocatalyst;visible light-driven
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lulu Zhao,Huilin Hou,Lin Wang,Chris R. Bowen,Jinguo Wang,Ruifang Yan,Xiaoqiang Zhan,Hongli Yang,Man Yang,Weiyou Yang
Creating useful chemicals based on artificial CO 2 photoreduction is considered to be an attractive approach to address the environmental and energy crises. Currently, its selectivity with high conversion efficiency is still a grand challenge. Here, we report the refined substitution of Bi 3+ with Ag + in ultrathin Bi 2 WO 6 nanosheets through a liquid-phase cation exchange process, favoring a high selectivity towards the photocatalytic production of CO from CO 2 . The incorporation of Ag + could not only significantly promote the adsorption of both CO 2 and H 2 O molecules, but also facilitate the transfer of photogenerated carriers. The as-fabricated photocatalyst achieves a high CO generation rate of 116.96 μmol g −1 with a superb selectivity of 95.7 % after 6 h reaction without any sacrificial agent, approximate 4.2 times higher than that of pure Bi 2 WO 6 . The mechanism for photocatalytic CO 2 reduction is proposed, based on in-situ Fourier Transform Infrared spectrometry analyses and Density Functional Theory calculations.
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
Surfaces and Interfaces
·
2025
·
IF 6.3
Lujie Ruan,Honglin Zhou,Xiangyu Li,Yuxuan Wang,Pengfei Luo,Haixuan Wang,Jiangping Ma,Chaogang Ban,Xiaoxing Wang,Jiangjie Ye,Yajie Feng,Jili Yue,Li-Yong Gan,Xiaoyuan Zhou,Ji-Yan Dai
Addressing the growing demand for clean energy necessitates innovative approaches to enhance hydrogen production efficiency. Combining photo-catalysis and piezo-catalysis offers a synergistic strategy for energy conversion, yet the limited charge transfer and separation efficiency in pure Bi 2 WO 6 hinders its catalytic performance. Herein, by adopting Ag nanoparticles deposited on Bi 2 WO 6 nanosheets (Bi 2 WO 6 –2% Ag) as a paradigm, it is demonstrated that the incorporation of Ag significantly enhances charge separation and transfer via improved piezoelectric and electronic interactions. This modification not only boosts the piezoelectric coefficient by 1.78-fold but also promotes the generation of piezo-induced and photogenerated carriers. Consequently, Bi 2 WO 6 –2% Ag achieves a hydrogen yield of 14.3 mmol·g -1 ·h -1 under piezo-catalytic conditions, a 60.7% improvement compared to pristine Bi 2 WO 6 . Under combined piezo-photo-catalytic conditions, the hydrogen yield further increases to 30.9 mmol·g -1 ·h -1 . The enhanced performance is attributed to the synergistic effects of ultrasonic vibration and ultraviolet light, which induce band bending and polarization-driven charge migration, facilitating hydrogen production. This study provides valuable insights into the integration of noble metal deposition and piezo-photo-catalysis, opening a new pathway for the design of advanced catalysts for sustainable hydrogen energy solutions.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Zihan Kang,Ni Qin,Enzhu Lin,Jiang Wu,Baowei Yuan,Dinghua Bao
The piezoelectric Bi 2 WO 6 nanosheets with in-plane spontaneous polarization were synthesized by hydrothermal method . The adsorption and piezocatalytic properties of the synthesized Bi 2 WO 6 nanosheets were investigated upon different variants including synthesis conditions, model dye species, and pH of the dye solution. The materials exhibited positive surface charge and selective adsorption ability for the anionic dye methyl orange (MO) in acidic and neutral conditions. The ultrafast removal of MO ( k obs = 0.718 ppm s −1 ) under ultrasonic vibration was mainly controlled by monolayer adsorption, which followed the pseudo-second-order adsorption kinetics and the Langmuir adsorption isotherm . To eliminate the interference of adsorption, the cationic Rhodamine B (RhB) was adopted as the target pollutant for piezocatalytic experiments. The maximum rate constant of RhB removal (3.9 × 10 −2 min −1 ) was obtained in Bi 2 WO 6 sample with the largest specific surface area of 32.8 cm 2 g −1 . The catalytic nature of the dye degradation phenomenon was confirmed by detection of free radicals and the quenching effect of radical scavengers. The present work demonstrates the potential of Bi 2 WO 6 nanosheets in piezocatalytic applications. Moreover, the synergistic effect of adsorption and piezocatalysis is valuable for in-situ regeneration of the piezoelectric adsorbents.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Yutong Yang,Lijie Zhao,Danfeng He,Dongmei Shi,Bing Zhao,Haixia Yu,Wanxia Tang,Jianhua Zheng
Considering the potential effects of physical and chemical properties and morphology on photocatalytic performance, La doped Bi 2 WO 6 nanosheets (La/Bi 2 WO 6 -NS) were synthesized by immersion method using Na 2 WO 4 ·2 H 2 O, Bi(NO 3 ) 3 ·5 H 2 O and La(NO 3 ) 3 as raw materials. The synthesized La/Bi 2 WO 6 -NS was characterized by SEM, TEM, XPS, XRD, UV–vis, PL, I-t and EIS. The enhancement of the photocatalytic activity of La/Bi 2 WO 6 -NS in the degradation of tetracycline (TC) and reduction of chromium (VI) can be attributed to the oxygen vacancy level generated by La doping, which played a crucial role in improving the performance of Bi 2 WO 6 -NS. Moreover, the unique 2D nanosheets feature afforded abundant active sites and endowed an enhanced the visible light response, further improved photocatalytic performance. Additionally, 4 % La/Bi 2 WO 6 -NS exhibited extraordinary the simultaneously photocatalytic degradation of Cr(VI)/TC efficiency with 92.0 % and 90.8 %, which are much higher than that of single Cr(VI) and TC. Combining of the experimental confirmations and the deep DFT calculations, the synergistic photocatalytic mechanism of the synthesized material was investigated systematically.
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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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huiqin Ma,Weiyi Yang,Shuang Gao,Wanrong Geng,Yunli Lu,Chunliang Zhou,Jian Ku Shang,Tuo Shi,Qi Li
The internal polarizations of polar photocatalysts could be enhanced through unit cell structure modulations to improve their photocatalytic performances. In this work, a simple, robust and low-cost NaOH etching process is developed to treat ultrathin Bi 2 WO 6 nanosheets after their creation, resulting in a higher degree of polyhedron distortion (∼141 %) and an enhanced piezoelectricity (∼260 % the maximum effective piezoelectric coefficient d 33 ). Compared with pristine ultrathin Bi 2 WO 6 nanosheets, these etched samples demonstrate an improved charge carrier separation and transfer behavior due to their enhanced internal polarization with the assistance of richer oxygen vacancies, which largely enhance their piezocatalysis (∼4.6 times), photocatalysis (∼14.3 times) and especially coupled photopiezocatalysis (∼33.9 times) performances as demonstrated in their sulfamethoxazole (SMX) degradation performances. ·O 2 – , 1 O 2 and h + are proven to be main reactive oxygen species (ROSs) during their photopiezocatalytic process and they could also work well in the real water matrix.
研究领域:
材料科学
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环境科学
·
催化化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jichong Wang,Jin Wang,Nuoya Li,Xinyi Du,Jun Ma,Chaohua He,Zhengquan Li
Photocatalytic CO2 reduction is an appealing approach to convert solar energy into high value-added chemicals. All-inorganic CsPbBr3 quantum dots (QDs) have emerged as a promising photocatalyst for reducing CO2. However, pristine CsPbBr3 has a low catalytic performance, mainly due to severe charge recombination. Herein, a 0D/2D heterojunction of CsPbBr3 QDs/Bi2WO6 nanosheet (CPB/BWO) photocatalysts is fabricated for photocatalytic CO2 reduction. The CPB/BWO photocatalyst achieves excellent photocatalytic performance: the total yield of CH4/CO is 503 μmol g–1, nearly 9.5 times higher than the pristine CsPbBr3. The CPB/BWO heterojunction also exhibits much-improved stability during photocatalytic reactions. On the basis of various characterization techniques, our investigations verified a direct Z-scheme charge migration mechanism between CsPbBr3 QDs and Bi2WO6 nanosheets. The improved photocatalytic performance is originated from the high spatial separation of photoexcited charge carriers in CPB/BWO, which can also preserve strong individual redox abilities of two components. This work reports an efficient direct Z-scheme heterojunction photocatalytic system based on metal halide perovskites. The novel strategy we proposed may bring up new opportunities for the development of metal halide perovskite photocatalysts with greatly enhanced activities.
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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DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
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
·
材料科学
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产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 16
·期 6
·3024-3033
·
IF 6.7
Ruowen Zhao,Yupu Zhang,Fangli Wu,Jianyuan Wang,Fang Chen,Wei Zhai
Integration of oxygen vacancies (Vo) into nanostructured semiconductor-based photocatalysts has been recognized as a promising strategy for enhancing the performance of photoelectrochemical (PEC) water splitting. However, precisely controlling the Vo concentration in photocatalysts via an effective and tunable approach remains challenging. Herein, a series of optimized bismuth tungstate (Bi2WO6) nanosheet-based photoanodes with varying concentrations of Vo were prepared by a sonochemical method with in situ cavitation detection, which enables accurate manipulation of the acoustic cavitation intensity applied to the surface of Bi2WO6 photoanodes in alkaline solution. Based on the analysis of the Vo concentration and sound field characteristics, the mechanism of sonochemical regulation of Vo in Bi2WO6 nanosheets was interpreted. Specifically, the increase in Vo concentration can be attributed to the enhancement of Bi–O bond dissociation. This enhancement is influenced not only by the intensified impact of shear force and the generation of active radicals by transient cavitation, but also by the accelerated diffusion of the reactant, a result of stable cavitation. By optimizing the transient and stable cavitation intensity, a Vo-rich Bi2WO6 photoanode was obtained without altering the microstructure of Bi2WO6 nanosheets. The presence of high concentration Vo facilitates the interfacial chemical reactivity and the transmission of photogenerated carriers, leading to the drastic promotion of the PEC water splitting performance. The transient photocurrent density of the Vo-rich Bi2WO6 photoanode reaches 69.2 μA cm−2 (1.23 V vs. RHE), 7.86 times that of the untreated Bi2WO6 photoanode. Additionally, the charge injection efficiency increases to 35.4%. This work provides a controllable and effective method for defect engineering of nanostructured semiconductor-based electrodes.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 4
·期 7
·2096-2102
·
IF 6.788
Aize Hao,Xueer Ning,Yali Cao,Jing Xie,Dianzeng Jia
A novel piezocatalyst, Bi2WO6 nanosheets (BWO NS), has been successfully synthesized by a simple, green and harmless solid-state chemistry method. The BWO NS present excellent piezocatalytic activity in contrast with other piezocatalysts towards methylene blue organic pollutant degradation under ultrasonic vibration. The piezocatalytic efficiency of BWO NS reaches ∼96% after 35 min and they exhibit good recycling performance, suggesting great potential for wastewater dye decolorization treatment. Superoxide radicals (˙O2−) and hydroxyl radicals (˙OH) are the main active species during the piezocatalytic process, based on ESR measurements and fluorescence spectra. The induced generation of polarized electric charges in the piezocatalytic process has also been demonstrated. The piezocatalytic mechanism has been further revealed, indicating that the excellent piezocatalytic activity could be attributed to the piezoelectric effect inducing electric charges to accelerate carrier transport during chemical redox reactions. Our work could offer new guidance for designing novel piezocatalysts and shed light on the relationships between piezocatalytic properties and mechanisms for application in pollutant degradation and energy conversion.
研究领域:
环境科学
·
材料科学
·
化学工程
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DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Kunxiang Deng,Yasen Wang,Yilin Wang,Zhifang Liu,Xinyi Li,Yixi Xie,Haoran Guo,Pengcheng Zhao,Junjie Fei
Chlorpyrifos (CPF) is widely utilized in agricultural practices, and its residue in food raise significant concerns food safety. However, current detection methods often suffer from complex operation procedures and unstable signal responses. Therefore, there is an urgent need to develop a reliable sensor for detecting CPF residue in food samples. In this work, a Z-scheme heterojunction was formed using hollow In 2 O 3 (H-In 2 O 3 ) and Bi 2 WO 6 nanosheets. The staggered band structure of the H-In 2 O 3 /Bi 2 WO 6 heterojunction facilitates carrier separation and transfer, thereby enhancing the sensor's response. In the presence of CPF, it reacts with · OH radicals generated by the heterojunction, further amplifying the signal. The sensor exhibits a linear response in the range of 5–700 nM with a limit of detection (LOD) of 0.72 nM. In addition, this photoelectrochemical sensor demonstrates satisfactory stability, anti-interference, selectivity and reproducibility, showing great potential for CPF analysis in real samples.
研究领域:
分析化学
·
环境监测
·
食品安全
·
材料科学
·
光电子学
·
农药残留检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）