CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Ling-Ling Zheng,Lei Tian,Dengke Wang,Ying Chen,Qian-Qian Tang,Qiu-Ju Xing,Xiao-Zhen Liu,Dai-She Wu,Jian-Ping Zou
Highly efficient and synergetic adsorption and activation of persulfate are the main challenges of the persulfate-based advanced oxidation processes. Herein, we synthesized a series of BiVO 4 -X with tunable ratios of (0 1 0)/(1 1 0) co-exposing facet to remove the sulfamethoxazole (SMX) via the regulation of adsorption and activation of peroxydisulfate (PDS). Under visible light, the BiVO 4 -2 with the (0 1 0)/(1 1 0) co-exposing facet ratios of 1.5 can efficiently remove 95.71% SMX in 120 min. Based on the PDS adsorption concentration-texture coefficient model (C-TC), Density functional theory (DFT) calculation and relevant experiments, we confirm the top (0 1 0) facet of BiVO 4 -X can act as the reactive plane to adsorb the PDS via a hanging method. And the photo/electrochemical tests show the facet-dependent internal charge transfer from the (1 1 0) to the activated (0 1 0) facet in the BiVO 4 -X. Finally, we propose the synergistic mechanism of adsorption and activation of PDS via the BiVO 4 -X for organic pollutants degradation. This work develops a new method to precisely regulate the co-exposed facets of crystal materials and illuminates the synergetic mechanism of the simultaneous adsorption and activation of PDS via the regulation of co-exposing facets of the BiVO 4 in the persulfate activation system.
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 Environmental Chemical Engineering
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2024
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IF 7.4
Jialin Qiu,Ye’an Zhu,Bo Wang,Yidan Nie,Zengkai Song,Peng Li,Zongbo Xie,Zhanggao Le
Photocatalytic removal of hexavalent uranium is an effective method for reducing radioactive uranium contamination in water. Herein, novel heterojunction catalysts, bismuth vanadate/hydrothermal carbon nitride (BiVO 4 /HCN), were synthesized and firstly successfully implemented for uranium removal. For example, the removal rate of U(VI) over 0.10BiVO 4 /HCN reached 98.5 % for the first time and more than 95.9 % for five consecutive cycles. Subsequent characterization analyzes confirmed that increased specific surface area, redshift of the absorption band, and efficient charge separation of the photogenerated electron-hole pairs collectively contributed to the improved photocatalytic performance. Noteworthily, free radical quenching and electron spin resonance spectroscopy results indicate that holes, photogenerated electrons, and superoxide radicals are the major active species for the photoreduction of U(VI). Finally, a possible photocatalytic mechanism of U(VI) removal 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
ACS Applied Energy Materials
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2024
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IF 5.4
SocMan Ho-Kimura
Photoactivated bismuth vanadate (BiVO4) anodes are highly promising candidates for solar-driven water splitting. Extant research has shown that prolonged light exposure results in the formation of a borate cocatalyst junction layer on the BiVO4 anode surface, which is attributable to the photocorrosion of BiVO4 and etching modification in a borate electrolyte; consequently, the photocurrent is significantly increased. This study analyzes the effects of light alone on photoactivated BiVO4 anodes in the absence of the borate cocatalyst. We utilized photocorrosion- and etching-resistant BiVO4 to prevent formation of the borate cocatalyst overlayer and investigated the effects of short-duration light irradiation on the photoelectrochemical (PEC) properties. Remarkably, we observed that pretreatment with a mere 20 min of light exposure in both air and electrolyte resulted in a notable increase in the photocurrent. In addition, this photoactivation effect recurred via repeated light irradiation and dark storage. The PEC technique was used to show that the intraband gap states reduced after photoactivation, and hole accumulation increased on the photoactivated BiVO4 surface during the subsequent water oxidation reaction. Furthermore, the spectroelectrochemical spectra revealed that the hole-trapping absorbance of photoactivated BiVO4 decreased. Photoincident absorption spectroscopy and transient absorption spectroscopy further showed an increased population of the photogenerated holes and an extended lifetime on the microsecond time scale, respectively, which contributed to improved PEC water-splitting activity with the photoactivated BiVO4. These findings are expected to offer deeper insights into the trap-filling mechanism underlying BiVO4 photoactivation and its effect on PEC water splitting.
研究领域:
材料科学
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能源转换
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光催化
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DOI
高影响因子
Materials
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2017
·Vol. 10
·期 8
·891
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IF 2.654
Deqiang Zhao,Wenwen Wang,Wenjuan Zong,Shimin Xiong,Qian Zhang,Fangying Ji,Xuan Xu
The band gaps of bismuth vanadate (BiVO4) and bismuth sulfide (Bi2S3) are about 2.40 eV and 1.30 eV, respectively. Although both BiVO4and Bi2S3are capable of strong visible light absorption, electron–hole recombination occurs easily. To solve this problem, we designed a one-step hydrothermal method for synthesizing a Bismuth sulfide (Bi2S3)/Bismuth vanadate (BiVO4) heterojunction using polyvinylpyrrolidone K-30 (PVP) as a structure-directing agent, and 2-Amino-3-mercaptopropanoic acid (l-cysteine) as a sulfur source. The pH of the reaction solution was regulated to yield different products: when the pH was 7.5, only monoclinic BiVO4was produced (sample 7.5); when the pH was 8.0 or 8.5, both Bi2S3and BiVO4were produced (samples 8.0 and 8.5); and when the pH was 9.0, only Bi2S3was produced (sample 9.0). In sample 8.0, Bi2S3and BiVO4were closely integrated with each other, with Bi2S3particles formed on the surface of concentric BiVO4layers, but the two compounds grew separately in a pH solution of 8.5. Visible-light photocatalytic degradation experiments demonstrated that the degradation efficiency of the Bi2S3/BiVO4heterojunction was highest when prepared under a pH of 8.0. The initial rhodamine B in the solution (5 mg/L) was completely degraded within three hours. Recycling experiments verified the high stability of Bi2S3/BiVO4. The synthesis method proposed in this paper is expected to enable large-scale and practical use of Bi2S3/BiVO4.Keywords:heterojunction;photocatalysis;hydrothermal method;bismuth vanadate;bismuth sulfide;pH value
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
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Jingyi Lin,Xiujun Han,Siyuan Liu,Ying Lv,Xin Li,Yixin Zhao,Yao Li,Lianzhou Wang,Shenmin Zhu
Photoelectrochemical water splitting using bismuth vanadate (BiVO 4 ) photoanodes is of special interest for solar energy utilization. However, its solar-to-hydrogen conversion efficiency is hindered by unfavorable surface reaction kinetics, which requires the development of efficient cocatalysts. Here, a nitrogen-doped cobalt-iron oxide (N-CFO) cocatalyst layer is designed on the BiVO 4 (BVO) by using Prussian blue analogue (PBA) precursor. The N-CFO/BVO photoanode exhibits an improved photocurrent density of 4.83 mA/cm 2 at 1.23 V vs. reversible hydrogen electrode under AM 1.5 G illumination, which is 4.13-fold that of pure BVO photoanode and surpasses that of CFO/BVO with oxygen vacancies. Mechanism studies reveal that compared with oxygen vacancies, nitrogen dopants greatly enhance electrical conductivity and boost reaction activity of cobalt-iron oxide. Owing to the diverse composition of PBAs, this work provides a novel insight into the effects of nitrogen dopants, as well as a general strategy to design efficient and cheap cocatalysts for photoanodes.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Minghui Sun,Xiaoguang Wang,Honghui Pan,Zhihui Pang,Yanrong Zhang
Industry for producing the vital chemical hydrogen peroxide (H 2 O 2 ) requires drastically reductions in energy consumption and environmental pollution. Solar chemical conversion from O 2 to H 2 O 2 is considered to be the most promising alternative method, nevertheless, weak energy coupling between photo-charges and adsorbed species limits the yield of H 2 O 2 . Herein, we demonstrate that oxygen vacancy-rich BiVO 4 can efficiently generate H 2 O 2 in pure water under visible light irradiation without any heterojunctions or precious-metal cocatalysts. Oxygen vacancies, as typical coordinatively unsaturated sites, enable efficient O 2 adsorption and enrichment, and then thriving chemisorption can spatially facilitate photoexcited electrons transfer to oxygen species. Compared to pristine BiVO 4 , defective BiVO 4 enhanced O 2 adsorption and interfacial electron transfer rate to O 2 by 19 and 23 times, respectively, resulting in a more than 32-fold increase in H 2 O 2 production. This research offers a new perspective for bridging solar and chemical energy by assuring species chemisorption.
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
PubMed
高影响因子
Energy & Environmental Science
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2017
·Vol. 10
·期 3
·772-779
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IF 29.518
Kai-Hang Ye,Zilong Wang,Jiuwang Gu,Shuang Xiao,Yufei Yuan,Yi Zhu,Yuanming Zhang,Wenjie Mai,Shihe Yang
Here, we demonstrate that carbon quantum dots (CQDs), as a low cost, chemically stable, and environmentally friendly photosensitizer, can dramatically broaden the light absorption range to the entire visible range. Consequently, the NiOOH/FeOOH/CQD/BiVO4 (NFCB) photoanode has achieved a remarkable photocurrent density of 5.99 mA cm−2 at 1.23 V vs. RHE under AM 1.5G in KH2PO4 aqueous solution without a hole scavenger (pH = 7) and a record high applied bias photon-to-current efficiency of 2.29% at 0.6 V vs. RHE for BiVO4-based photoanodes. This novel NFCB photoanode could operate stably for 10 h with a Faraday efficiency of ∼95%, demonstrating the great potential of using CQDs for solar water splitting.
研究领域:
材料科学
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可再生能源
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环境科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 47
·期 1
·203-210
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IF 3.925
Yaru Li,Fangxia Xie,Zijun Sun,Zhuobin Yu,Jianxin Liu,Xiaochao Zhang,Yawen Wang,Yunfang Wang,Rui Li,Caimei Fan
Bismuth vanadate (BiVO4) is one of the most effective photoanode materials for photoelectrochemical water splitting, but its reaction rate is greatly limited by the poor separation efficiency of photo-generated charges and sluggish kinetics. In this work, a surface hydroxylation strategy was carried out to overcome the above-mentioned shortcomings. A simple post-synthetic NaOH immersion method was used to successfully hydroxylate the BiVO4 photoanode surface without affecting its bulk properties. The modified surface hydroxyl group not only promotes the photo-generated charge separation efficiency of hydroxylated BiVO4 but also tailors its local electronic structure to form high-valence Bi(3+x)+ states. The Bi(3+x)+ species serving as the active site is advantageous for water dissociation, thus decreasing the free energy barrier of the potential-determining step for the boosted overall water oxidation kinetics. As a result, the best hydroxylated BiVO4 photoanode achieves a higher photocurrent density of 1.14 mA cm−2 at 1.23 V vs. RHE under visible light irradiation, which is 4.75 times that of bare BiVO4 (0.24 mA cm−2), and moreover, a cathodic shift of 190 mV at 1 mA cm−2 is obtained. Our work affords a practical method with strong operability to improve the intrinsic photoelectrochemical performance of photoanodes by the efficient surface hydroxylation strategy.
研究领域:
材料科学
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能源化学
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表面化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ling Yu,Hui Wang,Qi Huang,Hainan Liu,Qingkong Chen,Bojie Yuan,Qi Li,Xiaofei Zhao,Junwang Tang,Deqiang Zhao
A series of BiVO 4 /InVO 4 composites were synthesized by one-pot microwave method based on the ratio regulation of Bi/In. Consequently, the as-fabricated BiVO 4 /InVO 4 photocatalysts performed higher photocatalytic activities (100%) than pure InVO 4 and BiVO 4 . The prepared photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV–vis diffuse reflection spectroscopy (UV–vis DRS) and Fourier transform infrared spectra (FTIR). The results indicate the formation of BiVO 4 /InVO 4 and it possesses enhanced solar light absorption. The enhanced reduction rate is ascribed to the efficient separation of photogenerated charge carriers due to the heterojunction formed between BiVO 4 and InVO 4 . The possible photocatalytic mechanism of BiVO 4 /InVO 4 composite was also discussed in detail.
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
INORGANIC CHEMISTRY COMMUNICATIONS
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2025
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IF 5.4
Dusu Wen,Xing Xing,Yuanman Wang
In this study, BiV 1- x M x O 4 (M = Sc, Ti, W, Mo; x = 0, 0.005, 0.01, 0.02, 0.03, 0.05, 0.07, 0.10) samples with monoclinic structure were successfully synthesized by the conventional solid state reaction method, and the doping effects on the crystal structure, band structure and optical properties were investigated. XRD and Rietveld refinement results suggested the formation of solid solutions with monoclinic structure in low concentration range. UV–vis diffuse reflectance, XPS and VBXPS results revealed that the band structure of BiVO 4 could be adjusted by doping elements with different electronegativities into V site. It is found that the energy level of CBM raised by doping Sc and Ti which have lower electronegativities than V, and the energy level of CBM decreased by doping W and Mo which have higher electronegativities than V.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Weikang Lai,Zhuoyao Chen,Shengjun Ye,Yanbin Xu,Guangyan Xie,Chaozhi Kuang,Yuxin Li,Li Zheng,Longmeng Wei
In this research, bismuth vanadate-doped graphite felt (GF-BiVO 4 ) was successfully prepared by sol–gel method, in which BiVO 4 owned superior electro-Fenton (EF) and solar-photo-electro-Fenton (SPEF) performance. Combined with the analysis by X-ray diffractometer (XRD), field emission transmission electron microscopy (FE-TEM), nitrogen adsorption–desorption isotherms and cyclic voltammetry (CV), the changes of electrodes were reflected in structure and physicochemical properties . The doping of monoclinic BiVO 4 endued GF with a higher surface area and more electro-active sites and better electrode activity in comparison to Raw-GF. Then, the GFs were used as cathodes to detect •OH concentration with coumarin (COU) as probe molecule and to evaluate photoelectric performance with ciprofloxacin (CIP) in photocatalysis , EF and SPEF processes. The results demonstrated that the concentration of •OH followed an order of SPEF > EF > photocatalysis, which was consistent with the removal rate of CIP (99.8%, 99.4% and 21.2%, respectively) on GF-BiVO 4 at 5 min. Further, five degradation pathways of CIP in SPEF system were proposed including the attack on piperazine ring, oxidation on cyclopropyl group, decarboxylation and hydroxyl radical addition, oxidation on benzene group and defluorination . The study provides insights into the enhancement of EF and SPEF performance and the degradation pathway of CIP in SPEF.
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
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2023
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IF 9.9
Haipeng Wang,Shuyun Wang,May Thawda Oo,Yuewen Yang,Jiasheng Zhou,Miaoyan Huang,Rui-Qin Zhang
The photoelectrochemical (PEC) performance of bismuth vanadate (BiVO 4 ) suffers from sluggish charge mobility and substantial charge recombination losses due to its intrinsic defect. To rectify the problem, we developed a novel approach to prepare an n - n + type II BVO ac -BVO al homojunction with staggered band alignment. This architecture involves a built-in electric field that facilitating the electron-hole separation at the BVO ac /BVO al interface. As a result, the BVO ac -BVO al homojunction shows superior photocurrent density up to 3.6 mA/cm 2 at 1.23 V vs. reversible hydrogen electrode (RHE) with 0.1 M sodium sulfite as the hole scavenger, which is 3 times higher than that of the single-layer BiVO 4 photoanode. Unlike the previous efforts that modifying the PEC performance of BiVO 4 photoanodes through incorporating heteroatoms, the highly-efficient BVO ac -BVO al homojunction was achieved without incorporating any heteroatoms in this work. The remarkable PEC activity of the BVO ac -BVO al homojunction highlights the tremendous importance of reducing the charge recombination rate at the interface by constructing the homojunction and offers an effective strategy to form the heteroatoms-free BiVO 4 thin film as an efficient photoanode material for practical PEC applications.
研究领域:
材料科学
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能源科学
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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）