CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xinqiang Cao,Yan Gu,Hailin Tian,Yanfen Fang,David Johnson,Zhiyong Ren,Chuncheng Chen,Yingping Huang
In this work, BiVO 4 composites, containing the tetragonal zircon phase ( tz -BiVO 4 ), and monoclinic scheelite phase ( ms -BiVO 4 ), were synthesized using the microemulsion method. The effect of pH on phase composition and photocatalytic activity were investigated. Based on X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), a ms/tz -BiVO 4 composite forms at pH = 1.0 and pure ms -BiVO 4 is obtained in the pH range 4.0–10.0. The three primary steps in preparing BiVO 4 were monitored by optical microscopy and the role played by the microemulsion on the phase composition of BiVO 4 is explained. Photoluminescence spectroscopy (PL), UV–visible diffuse reflectance spectroscopy (UV-DRS), Brunauer-Emmett-Teller (BET), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were employed to characterize the physical and chemical properties of BiVO 4 composites. The composite formed at pH = 1 exhibited the lowest hole-electron ( h + - e - ) recombination rate, resulting in the highest photocatalytic activity towards microcystin-LR (MC-LR), with near 100% removal of MC-LR in 5 h. ESR and trapping experiments indicated that MC-LR degradation was mediated primarily by hydroxyl radicals (•OH), superoxide radicals (O 2 •− ) and photogenerated holes ( h + ).
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
Materials
·
2023
·Vol. 16
·期 21
·6879
·
IF 3.4
Yuquan Wang,Yidong Xu,Xinjie Cai,Jinting Wu
Adsorption and photocatalysis are effective in removing organic pollutants from wastewater. This study is based on the memory effects of MgAl–layered double hydroxides (MgAl–LDHs) after high-temperature calcination. By introducing bismuth vanadate (BiVO4) during the reformation of the layered structure via contact with water, a composite material BiVO4/MgAl–LDHs with enhanced adsorption and visible light catalytic performance was synthesized. The effects of the calcination temperature, ratio, initial methylene blue (MB) concentration, and catalyst dosage on the adsorption and photocatalytic performance were investigated. The BiVO4/MgAl–LDHs showed better photocatalytic performance than the pure BiVO4and MgAl–LDHs. Under the optimal conditions, the proportion of MB adsorbed in 20 min was 66.1%, and the percentage of MB degraded during 100 min of photolysis was 92.4%. The composite photocatalyst showed good chemical stability and cyclability, and the adsorption-degradation rate was 86% after four cycles. Analyses of the adsorption and photocatalytic mechanisms for the composite material showed that synergistic adsorption and visible light photocatalysis contributed to the excellent catalytic performance of the BiVO4/MgAl–LDHs. A highly adsorbent photocatalytic composite material exhibiting outstanding performance was prepared via a simple, cost-effective, and environmentally friendly method, providing reference information for the removal of organic pollutants from liquids.Keywords:BiVO4;MgAl–LDHs;memory effect;adsorption-visible photocatalytic performance;organic pollutants
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 SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 24
·期 2
·411-420
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IF 2.531
Chen Li,Chen Yu,Miao Lili,Gao Yiming,Di Junwei
In this work, we reported the photocurrent switching effect on BiVO 4 semiconductor as well as its application for construction of a new cathodic photoelectrochemical (PEC) biosensor. Specifically, the photocurrent switching effect of BiVO 4 upon fluorine doped tin oxide (FTO) glass substrate was greatly dependent on its treatment temperature and composition of solution in the cell. The photocurrent transition potential from anode to cathode is ~ 0.38 V (vs SCE) in the presence of O 2 . H 2 O 2 can act as electron acceptor to improve cathodic PEC current at electrode treated under 500 °C. A cathodic PEC biosensor of glucose was designed based on glucose oxidase (GOD). The GOD/BiVO 4 /FTO photoelectrode exhibited high sensitivity towards the enzyme reaction production of H 2 O 2 . This PEC biosensor shows a good response on the concentration of glucose and exhibits a dynamic range of 1~400 μM with a detection limit of 0.73 μM. Interference from oxygen fluctuation was negligible. The present work provides a promising approach to develop other oxidase-based PEC biosensors.
研究领域:
生物传感
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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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Xin Li,Miao Kan,Tian Wang,Zhixiao Qin,Ting Zhang,Xufang Qian,Yasutaka Kuwahara,Kohsuke Mori,Hiromi Yamashita,Yixin Zhao
Photoelectrochemical generation of reactive chlorine species (PEC-RCS) is a promising approach for wastewater treatment . However, the inevitable byproduct of harmful oxychloride (such as ClO 3 − and ClO 4 − ) severely limits the practical applications of full-spectrum solar-driven PEC-RCS systems. Herein, we investigated three typical photoelectrodes including TiO 2 , WO 3 and BiVO 4 for PEC-RCS system and the formation of RCS and toxic oxychlorides. In BiVO 4 photoelectrochemical cell, the concentration of ClO 3 − was lower than 0.2 mg/L and the ClO 4 − was undetectable within 2 h of reaction. In contrast, the concentrations of ClO 3 − were 2.3 mg/L and 2.7 mg/L in the widely used WO 3 and TiO 2 PEC-RCS processes, respectively, which exceeded the health standard of 0.7 mg/L raised by the European Food Safety Authority (EFSA). We proposed that the valence band dependent photoelectrochemical properties of BiVO 4 photoelectrodes could lead to the restricted HO· radical production and the non-HO·-mediated RCS generation, which synergistically inhibited the ClO 3 − formation in the RCS activation process.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
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2023
·Vol. 13
·期 6
·3612-3622
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IF 3.9
Yiyao Zhang,Hongchen Song,Jintai Han,Yunchao Liu,Jing Sun,Tingting Shen,Xikui Wang,Zhen Wang,Weizhen Zhang,Xuerui Yao
A Bi2WO6/BiVO4 composite photocatalytic material was synthesized by the hydrothermal method, and achieved the effective degradation of oxytetracycline (OTC) and tetracycline (TC) under visible light. The compositions, structures, chemical states and optoelectronic properties of Bi2WO6, BiVO4 and Bi2WO6/BiVO4 composites were characterized by systematic characterization. The results show that the existence of the heterojunction interface facilitates the separation of photogenerated carriers. Compared with the pure catalyst of Bi2WO6 and BiVO4, the Bi2WO6/BiVO4 composite material significantly improves the degradation efficiency of OTC and TC. The degradation rate is 6.22 and 3.02 times higher than that of Bi2WO6 and BiVO4, respectively. Through the free radical quenching experiments, it is known that photogenerated holes (h+) and superoxide anion free radicals (·O2−) are the main active substances in the degradation of OTC. By analyzing the process of photocatalytic degradation of OTC, there are mainly six intermediates during the process. Their possible degradation pathways are also inferred in this paper.
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
MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Meng Wang,Qiwen Wang,Xiaohong Wang,Shengtian Wang
An efficient electrochemical sensor based on nitrogen functionalized biochar (N-BC) and BiVO 4 hybrid nanocomposites was prepared, and used for simultaneous detection of furazolidone (FZD) and chloramphenicol (CAP) with highly sensitive and selective in food sample. The N-BC was obtained by acid activation method which using biomass waste (rice halls) as the raw and processed material and urea as the nitrogen source, which was further mixed with BiVO 4 to synthesized N-BC/BiVO 4 composite. The surface morphology and structured properties were characterized by Scanning electron microscopic (SEM), Nitrogen (N 2 ) adsorption/desorption isotherms, X-ray powder diffraction (XRD) patterns, Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The cyclic voltammetry (CV) and electrochemical impedance studies of N-BC/BiVO 4 film on GCE showed that electron transfer rate in [Fe (CN) 6 ] 3−/4− solution was rapider than bare GCE, N-BC/GCE and BiVO 4 /GCE. The sensor was successfully used for the detection of FZD and CAP with wide linear ranges of 0.1–1600 μM for FZD and 0.1–3200 μM for CAP, low limit of detection of 0.053 μM for FZD and 0.087 μM for CAP (S/N = 3), respectively. In addition, the proposed sensor has shown good anti-interference ability, reproducibility and stability, and obtained satisfactory results for respective or simultaneous detection of FZD and CAP in milk sample.
研究领域:
食品科学
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分析化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Rui Liu,Ru Li,Lei Yang,Rong-Xu Wang,Han-Yang Chen,Nan Wang,Zhi Li,You-Qiang Chen,Seeram Ramakrishna,Yun-Ze Long
Herein, FeOOH quantum dots and a Z-scheme BiVO4/g-C3N4 catalyst were coupled to obtain a Z-scheme heterojunction for photo-Fenton reactions to facilitate the transport of electrons and the generation of radicals. The obtained materials exhibited better visible light-driven photo-Fenton degradation of Rhodamine B, which is 22.06 times as high as pure BiVO4, 18.65 times as high as pure g-C3N4, and 3.44 times as high as BiVO4/g-C3N4, showing great potential in photo-Fenton degradation of pollutants. Moreover, the performance tests, radical capture experiments, and time-resolved fluorescence spectroscopy revealed that electron migration exists between the BiVO4/g-C3N4 and FeOOH-QDs. This composite system accelerates the cycling of Fe3+/Fe2+ during the photo-Fenton process, thus continuously generating reactive species (hydroxyl radicals (−OH) and superoxide radicals (−O2–)), leading to the rapid degradation of organic pollutants.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 42
·22561-22570
·
IF 14.511
Kai Song,Huilin Hou,Chuangchuang Gong,Fengmei Gao,Dongdong Zhang,Fang Zhi,Weiyou Yang,Fang He
Photoinduced charge separation and transfer has been recognized as one of the core factors affecting the photoelectrochemical (PEC) performance of BiVO4 based photoanodes. To achieve a higher charge separation efficiency, modulating the surface band edge of BiVO4-based photoanodes could be regarded as the best choice but still a challenge. Herein, first, it was confirmed by density functional theory (DFT) calculations that pristine BiVO4 could form a type-II heterojunction with BiVO4–VBi (replacing Bi sites with V in BiVO4), which could be used to enhance carrier separation. Then we use a gas-phase cation exchange (CA) method to in situ modulate the surface band edge of the BiVO4 photoanode by partially replacing Bi on the surface with V to form a V-rich surface. The charge separation efficiency of the optimized V-rich BiVO4 (V/BVO) photoanode is significantly enhanced from 56.5% to 81.5% compared to pristine BiVO4. As expected, it also displays a higher photocurrent density of 2.87 mA cm−2 at 1.23 V vs. RHE (under AM 1.5G illumination), which is nearly 3.2 times higher compared with pristine BiVO4. Upon further loading the FeOOH cocatalyst, the photocurrent of the V/BVO/FeOOH photoanode reached 4.26 mA cm−2 due to the boosted surface water oxidation properties. This work sheds light on a simple strategy to regulate surface band edges for designing highly efficient photoanodes.
研究领域:
材料科学
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能源科学
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光电化学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Jiarong Wu,Xinyu Li,Dayong Fan,Ming Li,Hongyu Zhu,Shuai Li
Bismuth vanadate (BiVO 4 ) is a promising metal oxide photoabsorber for photoanode applications but is limited by its relatively short hole diffusion length resulting in severe charge complexation and limited performance. Herein, Ag 3 PO 4 was compounded on BiVO 4 through photodeposition of Ag followed by solution oxidation. The annealing of the composite BiVO 4 /Ag 3 PO 4 heterojunction at 400 °C precipitated some Ag from Ag 3 PO 4 on BiVO 4 /Ag 3 PO 4 to form a new ternary photoanode BiVO 4 /Ag 3 PO 4 /Ag. Compared to the unannealed sample, the light trapping and crystal quality enhanced, resulting in increased photocurrent density of the annealed BiVO 4 /Ag 3 PO 4 photoanode (4.46 mA cm −2 ) by 59.9 % when compared to the unannealed photoanode (2.79 mA cm −2 ). To further optimize the photoanode, co-catalyst iron hydroxyl oxide (FeOOH) was deposited to yield BiVO 4 /Ag 3 PO 4 /Ag/FeOOH photoanode with maximum photocurrent density of 4.71 mA cm −2 at 1.23 V (vs. reversible hydrogen electrode, V RHE ), equivalent to about 3.7-fold the value of BiVO 4 photoanode. The photoanode maintained 90.8 % of its initial current density after 3 h stability tests. Besides, the photoelectrocatalytic degradation of Rhodamine B pollutant by BiVO 4 /Ag 3 PO 4 /Ag and BiVO 4 /Ag 3 PO 4 /Ag/FeOOH photoanode showed performance enhancement when compared to BiVO 4 /Ag 3 PO 4 . Overall, the proposed strategy looks very promising for the rational fabrication of high-efficiency heterojunction photoanodes.
研究领域:
材料科学
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光电化学
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催化
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环境科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
·
IF 4.1
Shan Huang,Mengmeng Wang,Jiajia Liu,Xinqi Liu,Min Xue,Yi Fang,Qi Xiao
Black phosphorus (BP) is highly regarded in photocatalysis for its bandgap thickness dependency, high hole mobility, and broad visible light absorption. This study introduces a simple hydrothermal method to construct a BP QDs/BiVO 4 direct Z-scheme heterojunction. The composite’s crystal structure, morphology, and photochemical properties were comprehensively characterized. The photocatalytic activity was evaluated using Rhodamine B (RhB) degradation under visible light. Notably, BP QDs 0.12% /BiVO 4 exhibited exceptional performance, achieving a 95.4 % RhB degradation after 100 min, three times higher than BiVO 4 alone. The direct Z-scheme heterojunction played a pivotal role in facilitating O 2 − and h + involvement in the degradation process. The interfacial interaction between BP QDs and BiVO 4 significantly enhanced BiVO 4 ′s visible light absorption, preserving its strong oxidation–reduction capacity. This enhancement was further corroborated by DFT simulation calculations. Overall, this study presents a novel approach for constructing efficient Z-scheme photocatalysts based on BP QDs, laying a solid foundation for their application in the field of photocatalytic degradation.
研究领域:
材料科学
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环境科学
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计算化学
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产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Yaxi Tian,Dongyun Que,Rongfeng Guan,WenYan Shi
Cu-BiVO 4 photocatalysts with an excellent visible light response were successfully fabricated by modification with a SiO 2 template and Cu doping. The SiO 2 hard template changes the morphology of BiVO 4 from rod to sphere. The structure, chemical composition, and optical and photoelectrochemical properties of the photocatalysts were characterized. The photocatalytic activity was measured through RhB degradation under visible light irradiation. The results indicate that copper is successfully doped in the form of Cu 2+ and Cu + . Copper can be used as electron capture traps, which reduces the carrier recombination rate. Compared with other reports, Cu doping is found to greatly improve the ability of BiVO 4 to degrade RhB. The crystal phase of BiVO 4 is not significantly changed due to Cu doping, and the optimal doping amount is 10%. The RhB degradation rate of the optimal 10% Cu-BiVO 4 sample reaches 99.7% within 70 min. Cu-BiVO 4 exhibits stable degradation activity, and the photocatalytic kinetics follows a pseudo-first-order equation. ·O 2 - and h + play dominant roles in RhB degradation by Cu-BiVO 4 . The mechanism for the enhancement of the BiVO 4 photocatalytic ability was researched with first-principles calculations. The results of band structure and density of states calculations reveal that Cu doping not only promotes electron transitions but also acts as an electron trap to reduce the recombination rate and enhance the efficiency of separation and transfer of photogenerated charge carriers. This work highlights a new way to improve the photocatalytic performance and applications of BiVO 4 .
研究领域:
材料科学
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环境科学
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理论计算
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 34
·期 1
·015711
·
IF 3.953
Maira Liaqat,Khalid Nadeem Riaz,Tahir Iqbal,Ghulam Nabi,Muhammad Rizwan,M Shakil
Heterostructure BiVO4/Bi2O3 nanocomposites with enhanced visible light activity are effectively synthesized through an easiest and single step hydrothermal route, using bismuth subnitrate and ammonium meta-vanadate as main raw materials in existence of citric acid. The phase and surface structure, topography and optical properties of synthesized composites are characterized by XRD, SEM, EDX, FTIR, UV–Visible and PL spectroscopy. It was found that 5%BiVO4/Bi2O3 (BOBV-5) nanocomposite exhibit excellent photocatalytic performance for rhodamine B dye degradation and tetracyclic under irradiation of visible light as compared to single component i.e. BiVO4. The increased photocatalytic activity should be ascribed for making p–n heterojunction among p-type Bi2O3 and n-type BiVO4. This p–n heterojunction successfully reduce the recombination of photogenerated charge carriers. Furthermore, the BOBV-5 novel photocatalyst shows good stability in constructive five cycles and photocatalytic activity is best for conquering photo corrosion of a photocatalysts. To explain charge migration route, whole photocatalytic mechanism was described in terms of energy band structures. Furthermore, the present work is helpful effort for design of new visible light photocatalytic materials with heterojunction structures.
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）