ACS Applied Materials & Interfaces
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2023
·
IF 9.5
Lulu Zhu,Baiyu Zhang,Qian Su,Runlu Liu,Jingyi Lin,Hua Wang,Shenmin Zhu,Yao Li
Photoinduced charge separation and surface reactions are essential for ensuring high quantum efficiency of the photochemical and photophysical processes. BiVO4-based heterojunctions are promising materials for high-performance photocatalysts; however, their photocatalytic performance is significantly lower than the theoretical limit due to the sluggish water oxidation dynamics and rapid recombination of charge carriers on the catalyst surface. To address these issues, oxygen vacancies (OVs) are introduced to a rationally designed BiVO4-based heterojunction using built-in potential and gradient OVs to promote the separation of carriers and increase the photocatalytic activity. The heterojunctions with OVs exhibit a 2-fold increase in the photocatalytic activity for phenol degradation compared with that of pristine BiVO4. Additionally, density functional theory is applied to elucidate the synergistic mechanism of light absorption and charge separation in BiOCl/BiVO4 p–n heterojunction photocatalysts containing vacancies. The obtained results demonstrate a synergistic effect of vacancies and the built-in potential, providing a pathway for defect engineering in photocatalytic processes.
研究领域:
材料科学
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环境科学
·
理论化学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Fuhua Li,Yapu Kang,Min Chen,Guoguang Liu,Wenying Lv,Kun Yao,Ping Chen,Haoping Huang
Characterized as by X-ray diffraction, scanning electron microscopy and UV–vis diffuse reflectance spectra techniques, BiVO 4 photocatalyst was hydrothermally synthesized. The photocatalytic degradation mechanisms of ibuprofen (IBP) were evaluated in aqueous media via BiVO 4 . Results demonstrated that the prepared photocatalyst corresponded to phase-pure monoclinic scheelite BiVO 4 . The synthesized BiVO 4 showed superior photocatalytic properties under the irradiation of visible-light. The photocatalytic degradation rate of IBP decreased with an increase in the initial IBP concentration. The degradation process followed first-order kinetics model. At an IBP concentration of 10 mg L −1 , while a BiVO 4 concentration of 5.0 g L −1 with pH value of 4.5, the rate of IBP degradation was obtained as 90% after 25 min. The photocatalytic degradation of IBP was primarily accomplished via the generation of superoxide radical ( O 2 • − ) and hydroxyl radicals ( • OH). During the process of degradation, part of the • OH was converted from the O 2 • − . The direct oxidation of holes (h + ) made a minimal contribution to the degradation of IBP.
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
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jingkun Wang,Jidong Sun,Yuliang Liu,Xun Zhang,Kai Cheng,Yupeng Chen,Fangzhou Zhou,Jujie Luo,Tianbao Li,Junjie Guo,Bingshe Xu
Modification of oxygen evolution co-catalyst (OEC) on the surface of bismuth vanadate (BiVO 4 ) can effectively improve the kinetics of water oxidation, but it is still limited by the small hole extraction driving force at the BiVO 4 /OEC interface. Modulating the BiVO 4 /OEC interface with a hole transfer layer (HTL) is expected to facilitate hole transport from BiVO 4 to the OEC surface. Herein, a copper(I) thiocyanate (CuSCN) HTL is inserted between BiVO 4 and NiFeO x OEC to create BiVO 4 /CuSCN/NiFeO x photoanode, resulting in a significant enhancement of photoelectrochemical (PEC) water splitting performance. From electrochemical analyses and density functional theory (DFT) simulations, the markedly enhanced PEC performance is attributed to the insertion of CuSCN as an HTL, which promotes the extraction of holes from BiVO 4 surface and boosts the water oxidation kinetics. The optimal photoanode achieves a photocurrent density of 5.6 mA cm −2 at 1.23 V versus the reversible hydrogen electrode (vs. RHE) and an impressive charge separation efficiency of 96.2 %. This work offers valuable insights into the development of advanced photoanodes for solar energy conversion and emphasizes the importance of selecting an appropriate HTL to mitigate recombination at the BiVO 4 /OEC interface.
研究领域:
材料科学
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能源转换
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界面工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Li Li,Mingqing Li,Huan Liu,Boya Li,Baohui Wang
BiOI film was electrodeposited deposited on fluorine doped tin oxide (FTO), then it was transformed into a nanoporous BiVO 4 film by annealing at 420 °C. The BiVO 4 /FTO electrode is used as photoelectrochemical (PEC) sensor to detect ascorbic acid (AA) for the first time. Under illumination of low power 20 W LED lamp, the current density of the sensor increases with the increase of AA concentration. The proposed PEC sensor exhibited a sensitive detection for AA in a wide range from 5 μM to 300 μM with a low detection limit of 1 μM (S/N = 3) and sensitivity of 293 μA mM −1 cm −2 . A portable AA detection device was constructed with a 20W LED lamp as the light source, BiVO 4 /FTO electrode as an anode, Pt as a cathode, and ammeter as a photoelectric signal receiver. The concentration of AA detected by this device is close to that measured by the electrochemical workstation (RSD<10%), which makes the sensor practical and portable.
研究领域:
分析化学
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生物医学工程
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产品关联
DOI
高影响因子
Inorganics
·
2022
·Vol. 10
·期 12
·264
·
IF 3.149
Yangqin Gao,Guoqing Yang,Zhijie Tian,Hongying Zhu,Lianzheng Ma,Xuli Li,Ning Li,Lei Ge
The bare surface of BiVO4photoanode usually suffers from extremely low interfacial charge transfer efficiency which leads to a significantly suppressed photoelectrochemical water splitting performance. Various strategies, including surface modification and the loading of co-catalysts, facilitate the interface charge transfer process in BiVO4. In this study, we demonstrate that CoS2synthesized from the hydrothermal method can be used as a high-efficient co-catalyst to sufficiently improve the interface charge transfer efficiency in BiVO4. The photoelectrochemical water splitting performance of BiVO4was significantly improved after CoS2surface modification. The BiVO4/CoS2photoanode achieved an excellent photocurrent density of 5.2 mA/cm2at 1.23 V versus RHE under AM 1.5 G illumination, corresponding to a 3.7 times enhancement in photocurrent compared with bare BiVO4. The onset potential of the BiVO4/CoS2photoanode was also negatively shifted by 210 mV. The followed systematic combined optical and electrochemical characterization results reveal that the interfacial charge transfer efficiency of BiVO4was largely improved from less than 20% to more than 70% due tor CoS2surface modification. The further surface carrier dynamics study performed using an intensity modulated photocurrent spectroscopy displayed a 6–10 times suppression in surface recombination rate constants for CoS2modified BiVO4, which suggests that the key reason for the improved interfacial charge transfer efficiency possibly originates from the passivated surface states due to the coating of CoS2.Keywords:BiVO4;CoS2;photoelectrochemical water splitting;intensity modulated photocurrent spectroscopy;surface recombination
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Semiconductors
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2016
·Vol. 37
·期 8
·083004
·
IF 0
Ying Wu,Jing Wang,Yunfang Huang,Yuelin Wei,Zhixian Sun,Xuanqing Zheng,Chengkun Zhang,Ningling Zhou,Leqing Fan,Jihuai Wu
Novel, three-dimensional, flower-like Bi2O3/BiVO4 heterojunction photocatalysts have been prepared by the combination of homogeneous precipitation and two-step solvothermal method followed by thermal solution of NaOH etching process. The as-obtained samples were fully characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Brunauer-Emmett-Teller surface area, and UV—vis diffuse-reflectance spectroscopy in detail. The crystallinity, microstructure, specific surface area, optical property and photocatalytic activity of samples greatly changed depending on solvothermal reaction time. The photocatalytic activities of samples were evaluated on the degradation of methyl orange (MO) under visible-light irradiation. The Bi2O3/BiVO4 exhibited much higher photocatalytic activities than pure BiVO4 and conventional TiO2 (P25). The result revealed that the three-dimensional heterojunction played a critical role in the separation of the electron and hole pairs and enhancement of the interfacial charge transfer efficiency, which was responsible for the enhanced photocatalytic activity.
研究领域:
材料科学
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环境科学
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DOI
ACS Omega
·
2023
·
IF 4.1
Bo Peng,Yifan Hao,Chao Si,Bo Wang,Chengfeng Luo,Menghao Chen,Cheng Luo,Baijuan Gong,Zhimin Li
Oral cancer is the most common malignant tumor in the oral and maxillofacial region, which seriously threatens the health of patients. At present, radiotherapy is one of the commonly used methods for oral cancer treatment. However, the resistance of cancerous tissues to ionizing radiation, as well as the side effects of X-rays on healthy tissues, still limit the application of radiotherapy. Therefore, how to effectively solve the above problems is still a challenge at present. Generally speaking, elements with high atomic numbers, such as bismuth, tungsten, and iodine, have a high X-ray attenuation capacity. Using nanomaterials containing these elements as radiosensitizers can greatly improve the radiotherapy effect. At the same time, the modification of nanomaterials based on the above elements with the biocompatible polymer can effectively reduce the side effects of radiosensitizers, providing a new method for the realization of efficient and safe radiotherapy for oral cancer. In this work, we prepared Tween-20-modified BiVO4 nanorods (Tw20-BiVO4 NRs) and further used them in the radiotherapy of human tongue squamous cell carcinoma. Tw20-BiVO4 NRs are promising radiosensitizers, which can generate a large number of free radicals under X-rays, leading to the damage of cancer cells and thus playing a role in tumor therapy. In cell experiments, radiotherapy sensitization of Tw20-BiVO4 NRs significantly enhanced the production of free radicals in oral cancer cells, aggravated the destruction of chromosomes, and improved the therapeutic effect of radiotherapy. In animal experiments, the strong X-ray absorption ability of Tw20-BiVO4 NRs makes them effective contrast agents in computed tomography (CT) imaging. After the tumors are located by CT imaging, it helps to apply precise radiotherapy; the growth of subcutaneous tumors in nude mice was significantly inhibited, confirming the remarkable effect of CT imaging-guided radiotherapy.
研究领域:
肿瘤学
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放射学
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ning Wang,Yaping Zhang,Xingcheng Xu,Mengke An,Jijiao Gu,Wei Song,Jun Wan,Lei Wang
Modulation of two-dimensional (2D) morphology structure is an effective strategy to improve the electron transport properties of BiVO 4 photoanodes. However, up to now, the application of 2D BiVO 4 in photoelectrochemical water splitting has been extremely scarce reported. Here, a simple method to prepare nanoplate BiVO 4 photoanodes is reported. Mo-BiVO 4 nanoplates were grafted on the conventional BiVO 4 particles by the mild method. Due to the special structure, the specific surface area of the photoanode is increased, which enhances the light absorption and utilization efficiency. Moreover, the homojunction formed between BiVO 4 substrate and Mo-doped BiVO 4 nanoplate promotes the separation of photogenerated carriers and the transfer of photogenerated holes to the electrolyte interface. The abundant specific surface area also provides more support for the co-catalyst. As a result, under multiple facilitation, the photocurrent density of the BiVO 4 /Mo-BiVO 4 /CoPi photoanode is enhanced to 5.1 mA/cm 2 at 1.23 V vs. RHE.
研究领域:
材料科学
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光化学
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能源材料
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纳米技术
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2011
·Vol. 14
·期 3
·1038-1044
·
IF 4.006
Ming Ge,Lu Liu,Wei Chen,Zhen Zhou
With Rhodamine B as a model compound, the photocatalytic oxidation of organic contaminants in aqueous solution was investigated within a cooperating porous BiVO4/H2O2 system under simulated sunlight irradiation. Peanut-shaped porous BiVO4 was prepared through a simple template-free solvothermal method with high yield, and was used in the cooperating catalyst/H2O2 system. The possible formation mechanism of peanut-shaped BiVO4 nanostructures was investigated. In the peanut-shaped BiVO4/H2O2 system, nearly complete degradation of Rhodamine B was observed after 60 min of irradiation under sunlight irradiation. The as-obtained porous BiVO4 photocatalyst displayed higher photocatalytic activity than those of the reference product hydrothermally synthesized and the photocatalyst P25 in the same catalyst/H2O2/sunlight system. The photocatalytic processes of the BiVO4/H2O2/sunlight system may consist of both OH˙ oxidation and direct hole attack. In addition, the peanut-shaped porous BiVO4 nanostructures were stable and maintained high photocatalytic efficiency during repeated recycles in the H2O2-containing system.
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
Journal of Environmental Sciences
·
2022
·
IF 6.796
Yunlong Chen,Yingping Huang,Hailin Tian,Liqun Ye,Ruiping Li,Chuncheng Chen,Zhongxu Dai,Di Huang
With increasing concerns on the environment and human health, the degradation of glyphosate through the formation of less toxic intermediates is of great importance. Among the developed methods for the degradation of glyphosate, photodegradation is a clean and efficient strategy. In this work, we report a new photocatalyst by doping F ion on BiVO 4 that can efficiently degrade glyphosate and reduce the toxic emissions of aminomethylphosphonic acid (AMPA) through the selective (P)−C−N cleavage in comparison of BiVO 4 catalyst. The results demonstrate that the best suppression of AMPA formation was achieved by the catalyst of 0.3F@BiVO 4 at pH = 9 (AMPA formation below 10%). In situ attenuated total reflectance Fourier transforms infrared (ATR-FTIR) spectroscopy indicates that the adsorption sites of glyphosate on BiVO 4 and 0.3F@BiVO 4 are altered due to the difference in electrostatic interactions. Such an absorption alteration leads to the preferential cleavage of the C−N bond on the N−C−P skeleton, thereby inhibiting the formation of toxic AMPA. These results improve our understanding of the photodegradation process of glyphosate catalyzed by BiVO 4 -based catalysts and pave a safe way for abiotic degradation of glyphosate.
研究领域:
环境科学
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材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Guoxing Li,Hai-Tao Ren,Liyan Liu,Bing-Chiuan Shiu,Mei-Chen Lin,Ching-Wen Lou,Ting-Ting Li
This paper reports the preparation of BiVO 4 /BiOCl heterojunction photobiosensors with high sensitivity, stability and selectivity for detecting changes in dopamine concentration. BiVO 4 with nanostructures was prepared by electrostatic spinning, however, BiVO 4 semiconductor material is susceptible to complex inhibition of photogenerated carriers due to structural defects affecting the detection performance of the sensor, in order to solve this problem, BiVO 4 /BiOCl heterogeneous structures were prepared by hydrothermal synthesis. Not only the result of improving the interfacial charge separation efficiency, the photocurrent density was increased to 0.4 μA, but also the high sensitivity of the BiVO 4 /BiOCl heterojunction photovoltaic material for the detection of dopamine was improved. The linear response range for dopamine detection was 1-13 μM (R 2 = 0.99079) and the detection limit was 0.134 μM (S/N = 3). In addition, selective detection was achieved in the presence of a number of common interferences within human plasma, and the photocurrent response was tested for stability after sustained visible light irradiation.
研究领域:
材料科学
·
生物医学工程
·
分析化学
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产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2020
·
IF 3.612
Yaru Li,Xiaochao Zhang,Jianxin Liu,Yawen Wang,Yunfang Wang,Rui Li,Caimei Fan
A fish bone-like BiVO 4 film was successfully prepared in-situ on metal Bi substrate via a facile one-step hydrothermal method. The obtained BiVO 4 film exhibits excellent tetracycline photodegradation efficiency, reaching 89.7% in 240 min under visible light irradiation. Its quantum yield (6.3 × 10 −5 molecules photon −1 ) and kinetic reaction rate (7.80 μmol g −1 h −1 ) are better than most reported immobilized Bi-based systems. Finally, the formation mechanism was investigated, which suggests that OH − plays a vital role in forming BiVO 4 film by affecting the release of VO 3 − . The results of this study provide available means in the in-situ preparation of Bi-based photocatalyst film.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）