Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Junlei Zhang,Zhen Ma
A novel Ag 3 VO 4 /BiOIO 3 heterojunction catalyst was prepared by loading Ag 3 VO 4 nanoparticles onto BiOIO 3 nanosheets via precipitation. Ag 3 VO 4 /BiOIO 3 exhibited obviously higher activity than Ag 3 VO 4 and BiOIO 3 in photocatalytic degradation of aqueous dyes and tetracycline hydrochloride under visible-light irradiation. The recyclability of the catalyst was confirmed by cycling experiments. Photogenerated holes (h + ) and superoxide radical anions ( · O 2 − ) were demonstrated to be the main active species. Ag 3 VO 4 /BiOIO 3 can facilitate the separation and transfer of photogenerated carriers more efficiently than Ag 3 VO 4 and BiOIO 3 . Possible photocatalytic mechanisms were proposed.
研究领域:
材料科学
·
环境科学
·
光催化技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Gongduan Fan,Xia Li,Jiuhong Lin,Xinyi Wu,Ling Zhang,Jiaxin Wu,Yingmu Wang
In this work, a facile separation of self-floating Ag 3 VO 4 /BiVO 4 hydrogel (ABVH) photocatalyst was constructed via the freeze-thaw method for the inactivation of Microcystis aeruginosa . The as-synthesized photocatalyst exhibited excellent photocatalytic performance, resulting in the degradation efficiency of chlorophyll a reaching approximately 99.6% within 4 h under visible light. The cell morphology, intracellular organic matter (IOM), extracellular organic matter (EOM), and antioxidant system were severely disrupted during the photocatalytic process. The inactivation mechanism could be ascribed to the ·OH and h + generated by hydrogel photocatalyst under visible light irradiation. Furthermore, five repetitive experiments and cyclic compressive stress-strain tests demonstrated that the as-prepared hydrogel possessed excellent reusability and mechanical strength properties. Besides, the hydrogel photocatalyst showed excellent potential for the removal of M. aeruginosa in the presence of natural organic matter (NOM). Overall, the synthesized self-floating hydrogel photocatalyst may offer a novel insight into the control of harmful cyanobacterial blooms.
研究领域:
环境科学
·
微生物学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Junlei Zhang,Zhen Ma
Ag-Ag 3 VO 4 /AgIO 3 composites composed of Ag-Ag 3 VO 4 particles (major component) and AgIO 3 nanosheets (minor component) were obtained via photoreduction of Ag 3 VO 4 /AgIO 3 composites prepared by sequential precipitation. The optimal Ag-Ag 3 VO 4 /AgIO 3 catalysts (in particular, the one with an AgIO 3 /Ag 3 VO 4 mass ratio of 6.4%) were found to be more active than AgIO 3 , Ag 3 VO 4 , and Ag-Ag 3 VO 4 in the photocatalytic degradation of rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC) under visible-light irradiation. Ag-Ag 3 VO 4 /AgIO 3 can be reused in cycling experiments. Photogenerated holes (h + ) and superoxide radical anions ( O 2 − ) were demonstrated by radical-capture experiments as the main active species in the photocatalytic degradation of RhB. The more efficient separation and transfer of photogenerated electron-hole pairs are responsible for the enhanced activity of Ag-Ag 3 VO 4 /AgIO 3 . A possible photocatalytic mechanism is proposed.
研究领域:
材料科学
·
环境科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Si-Zhan Wu,Kui Li,Wei-De Zhang
Heterostructured photocatalysts Ag 3 VO 4 /g-C 3 N 4 were prepared by deposition-precipitation method in order to anchor Ag 3 VO 4 on the surface of N-vacancy g-C 3 N 4 (g-C 3 N 4 -VN). The photocatalytic activity of the samples was evaluated by degrading rhodamine B (RhB) in aqueous solution. Compared with the pure Ag 3 VO 4 and g-C 3 N 4 -VN, the heterojuncted photocatalyst 65 wt% Ag 3 VO 4 /g-C 3 N 4 -VN exhibits the best activity under visible light irradiation. The photodegradation rate constant of 65 wt% Ag 3 VO 4 /g-C 3 N 4 -VN is 0.0556 min −1 , which is 23.4, 5.8 and 6.4 times of that of pure Ag 3 VO 4 , pure g-C 3 N 4 -VN and P25, respectively. The excellent photocatalytic performance of the Ag 3 VO 4 /g-C 3 N 4 -VN catalysts can be ascribed to the matched band structures of Ag 3 VO 4 and g-C 3 N 4 , which strengthened the formation of the heterojuncted photocatalyst. The unique heterostructured photocatalyst is favorable for retarding the recombination of photogenerated electrons and holes, thus the photocatalytic activity is significantly increased. Further experiment also reveals that the •O 2 − and h + are the major active species in the degradation of RhB.
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
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2018
·Vol. 95
·期 2
·501-511
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IF 2.214
Shukun Le,Wenjing Li,Yue Li,Burenbayaer Borjigin,Guangshe Li,Xiaojing Wang
Ag 3 VO 4 /mpg-C 3 N 4 (mesoporous graphitic carbon nitride) heterojunction photocatalysts were prepared by anchoring tiny Ag 3 VO 4 particles on the nanosheet of mpg-C 3 N 4 . The prepared Ag 3 VO 4 /mpg-C 3 N 4 heterojunctions were used to remove tetracycline (TC), a kind of antibiotics widely released into the aquatic environment under solar irradiation. Compared with pure mpg-C 3 N 4 and Ag 3 VO 4 , Ag 3 VO 4 /mpg-C 3 N 4 displayed much higher photocatalytic activity (83.2% removal rate within 90 min under visible-light irradiation). Importantly, no apparent deactivation was observed for Ag 3 VO 4 /mpg-C 3 N 4 -40 after five cycles, inferring a good reusability. As confirmed by photocurrent measurement and photoluminescence spectra, the excellent photocatalytic property of Ag 3 VO 4 /mpg-C 3 N 4 was credit to the electron–hole separation enhancement at the formed heterojunction of two semiconductors. In addition, a possible mechanism and intermediate products for the Ag 3 VO 4 /mpg-C 3 N 4 photocatalysts toward the photodegradation of TC in aqueous solution under artificial sunlight radiation were proposed based on the scavengers trapping test, ESR spectra and a high-performance liquid chromatography (HPLC) coupled with mass spectrometer (MS) analysis. This investigation provides a low cost, green and easily practical approach to remove the antibiotics in the aquatic environment.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Qi Wang,Biao Xue,Meng Tan,Ningyi Li,Hao Zhou,Hao Du,Guoxiang Yang,Huaze Zhu,Qiang Li
Heterogeneous photocatalysis have attracted extensive attention in the field of environmental remediation. The low charge separation efficiency and poor light response of single semiconductor can be remarkably improved through forming heterojunction . The construction of ternary heterojunctions can further inhibit the recombination of photogenerated charge carriers by the separated redox active sites. A novel and highly efficient Ag 3 VO 4 -BiVO 4 /C 3 N 4 ternary heterojunction were successfully synthesized and characterized in terms of structure, chemical composition and photocatalytic properties. The photocatalytic activities of as-synthesized photocatalysts were evaluated by the photocatalytic reduction of Cr(VI) in the aqueous solution. The photocatalytic Cr(VI) reduction rate of ternary heterojunction is 19 times higher than that by single BiVO 4 . The lower pH, higher concentration of coexisted organics and stronger light intensity endowed photocatalysts with better photocatalytic performance. More Cr(VI) ions were remained in the solution with higher initial concentration of Cr(VI) under the same light irradiation. The Cr(VI) ions could also be totally removed by the ternary heterojunction even after five cycling tests showing good cycling stability. The internal electric field between Ag 3 VO 4 , BiVO 4 and graphitic carbon nitride (C 3 N 4 ) facilitated the separation of photogenerated electron/hole pairs. The suitable band alignments endow ternary heterojunction with isolated oxidation and reduction reactions due to the separated holes and electrons, meanwhile, suppressing charge carrier recombination. This research provides guidance for the rational design of multi-components heterojunction for photocatalytic environmental remediation.
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
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
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
·
材料科学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 9
·5100-5109
·
IF 3.049
Wenxue Li,Qianlin Chen,Xianyu Lei,Shang Gong
Herein, Ag/AgBr/Ag3VO4 composites were synthesized by a simple continuous precipitation method. The obtained composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy and photoluminescence spectroscopy (PL). Photocatalytic performance of the composites was assessed by the degradation of methyl orange (MO) and tetracycline hydrochloride (TC) under visible light, and the effects of different nominal mass ratios of AgBr and Ag3VO4 on the photocatalytic activity were investigated. The results showed that after 20 min of visible light irradiation (λ > 420 nm), the removal rate of MO in the presence of a 5 : 1 sample reached 98.6%. The EIS and photocurrent results demonstrated that the enhancement of the visible light photocatalytic activity was attributed to the efficient electron–hole pair separation. In addition, the scavenging reactions conducted via the addition of different scavengers confirmed that h+ and ·O2− were the main active species in the reaction. The present study offers potential for the degradation of contaminants.
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
Molecular Catalysis
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2017
·
IF 0
Junlei Zhang,Zhen Ma
Ag 3 VO 4 /BiOBr n-p heterojunctions were prepared via chemical deposition. Ag 3 VO 4 /BiOBr consists of Ag 3 VO 4 nanoparticles with sizes ranging from several to tens nanometers and flower-like BiOBr microspheres composed of irregular nanosheets. The photocatalytic performance of Ag 3 VO 4 /BiOBr and relevant samples was investigated in the visible-light-driven degradation of Rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC). Ag 3 VO 4 /BiOBr heterojunction with a BiOBr/Ag 3 VO 4 mass ratio of 10% was more active than a physical mixture of Ag 3 VO 4 and BiOBr, showing the importance of forming the heterojunction. Photogenerated holes (h + ) and superoxide radical anions ( O 2 − ) were found to be the primary active species. A possible mechanism for the enhanced photocatalytic performance was proposed.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Zhiyu Liu,Liang Chen,Congcong Piao,Jianhe Tang,Yu Liu,Yitong Lin,Dawei Fang,Jun Wang
A novel Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is prepared via hydrothermal and calcination methods. In this system, WO 3 :Yb 3+ ,Er 3+ is used as an excellent up-conversion luminescent agent and highly active photocatalyst to broaden the light response range. Ag with SPR effect is regarded as electronic channel and cocatalyst to accelerate electron transfer and increase hydrogen production. The photocatalytic performance of Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is assessed by levofloxacin degradation with synchronous hydrogen production. Some influence factors, sunlight irradiation time, sacrificial agent concentration and catalyst cycle number, are discussed. The emission light spectrum and energy conversion mechanism of WO 3 :Yb 3+ ,Er 3+ are studied. The photocatalyst gives prominent degradation ratio (90.44 %) and hydrogen production amount (489.02 μmol/g) under sunlight irradiation for 180 min. It shows a high stability and reusability in levofloxacin degradation with synchronous hydrogen production within five cycles. The possible mechanism of levofloxacin degradation with synchronous hydrogen production caused by Z-scheme WO 3 :Yb 3+ ,Er 3+ /Ag/Ag 3 VO 4 /Ag photocatalyst is proposed.
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
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Hongjun Fang,Yusong Pan,Haixian Yan,Xiulong Qin,Chao Wang,Linfeng Xu,Chengling Pan
A novel Yb 3+ /Tm 3+ co-doped Ti 3 C 2 /Ag/Ag 3 VO 4 composite with stable and robust photodegradation performance was synthesized by in-situ partially reduction along with hydrothermal strategy. In the composite, block-like Ag 3 VO 4 particles are self-assembled on the surface of 2D Ti 3 C 2 MXene accompanied by partial reduction of Ag + to Ag 0 . Photodegradation results showed that the resulting Yb 3+ /Tm 3+ co-doped Ti 3 C 2 /Ag/Ag 3 VO 4 composite with optimal Yb/Tm proportion (Y/T:0.3/0.005) presented a boosting photocatalytic performance for degradation of tetracycline (TC) and organic dyes under visible light irradiation. The removal efficiency was 97% for TC in 20 min, 96% for rhodamine B in 25 min, and 99% for methylene blue in 20 min, which was higher than that of Ag/Ag 3 VO 4 composite. As manifested by photoelectrochemical measurements, the enhanced photocatalytic performance of the Y/T:0.3/0.005 composite was attributed to the improved light absorption and excellent charge separation induced by the formation of intermediate energy states after co-doping Yb 3+ /Tm 3+ ions. Meanwhile, the photocatalytic mechanism of the photocatalyst was also investigated through electron spin resonance (ESR) spectra and trapping experiments, which verified that the active species of h + and ·O 2 − play the important role for photodegradation of tetracyline and organic dyes.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 18
·期 4
·3308-3315
·
IF 4.493
Ming Yan,Yilin Wu,Fangfang Zhu,Yinqun Hua,Weidong Shi
The construction of efficient photocatalysts for environmental remediation has attracted a great deal of attention in recent years. In this study, a novel Ag3VO4/WO3 heterojunction photocatalyst has been successfully prepared via a hydrothermal process and a facile precipitation reaction. Under visible light irradiation, the hybrid materials could significantly enhance photocatalytic activity for the degradation of tetracycline (TC) in comparison with single Ag3VO4 and WO3. Within 30 min, 71.2% TC could be photodegraded by the optimum sample (10% A/W), which was about 3.1 times and 4.6 times higher than that of the individual Ag3VO4 and WO3, respectively. Based on the active species trapping experiments and ESR, the photocatalytic oxidation mechanism of the Ag3VO4/WO3 composite was also discussed. It can be assumed that the enhancement of the photocatalytic activity was attributed to the heterojunction which could widely accelerate the separation of photogenerated electron–hole pairs. In general, WO3 hybridized with Ag3VO4 will also efficiently address the problem of low photocatalytic activity.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
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