JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
·
IF 3.261
Yi Wang,Xinyan Xiao,Jiayi Chen,Xingye Zeng
A novel AgBr and GO co-decorated g-C 3 N 4 /Ag 2 WO 4 (g-C 3 N 4 /Ag 2 WO 4 /AgBr/GO) composite was successfully fabricated by hexadecyl trimethyl ammonium bromide (CTAB)-assisted co-deposition of AgBr and GO onto g-C 3 N 4 /Ag 2 WO 4 composite. The as-prepared composites were characterized by XRD, SEM, TEM, FT-IR, BET, XPS, UV–vis diffuse reflectance spectra (DRS), photoluminescence spectra (PL), and electrochemistry impedance spectroscopy (EIS). The photocatalytic efficiency for tetracycline (TC) degradation over the as-prepared g-C 3 N 4 /Ag 2 WO 4 /AgBr/GO composite is 91.64% within 100 min simulated sunlight irradiation, which is nearly 2.59 and 5.25-folds greater than those of the g-C 3 N 4 /Ag 2 WO 4 and g-C 3 N 4 samples. The enhancement of photocatalytic performance is mainly ascribed to the introduction of AgBr and GO, which serve as photosensitizer and electron acceptor, respectively, confirmed by the results of DRS, PL, and EIS. The active species trapping experiments confirmed that O 2 − and h + are the dominant reactive species responsible for TC degradation. Furthermore, a reasonable n-n heterojunction-based photocatalytic mechanism for the g-C 3 N 4 /Ag 2 WO 4 /AgBr/GO composite 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
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Silong Wang,Yan Wang,Jinquan Wan,Yongwen Ma,Zhicheng Yan,Guihua Zhang
With high redox ability of electrons and holes, Z-scheme heterojunction is a promising composite structure in the photocatalysis. However, it is challenging to inhibit the recombination of carriers by Z-scheme transfer. Herein, a novel Ag 3 PO 4 /AgBr/Ti 3 C 2 Tx hybrid with dual channel carrier transfer structure was fabricated. Ti 3 C 2 Tx not only serves as a template for growth of Z-scheme Ag 3 PO 4 /AgBr, but also can be used to accommodate holes transferred from Ag 3 PO 4 and AgBr. The first channel is consisted of Z-scheme transfer of carriers in Ag 3 PO 4 /AgBr. And the hole transfer from the AgBr valence band to Ti 3 C 2 Tx constitutes the second channel, which avoids directly carrier recombination in AgBr valence band. Dual channel carrier transfer pathway was proved by in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS). After Ti 3 C 2 Tx was introduced, the quantum efficiency of Ag 3 PO 4 /AgBr increased from 10.59% to 12.50% with reducing Cr(VI), indicating an increase in carrier utilization. The improvement of the degradation efficiency of rhodamine B from 80.77% to 94.72% is benefited from the enhanced quantum efficiency. The dual channel carrier transfer heterojunctions design provides a new idea for constructing an efficient composite photocatalytic structure.
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
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
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环境科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Rui Lu,Lingxi Qiu,Yiwen Xie,Jiaying Luo,An Chen,Yang Xu,Tian Shang,Dongmei Jiang,Qingfeng Zhan
In this work, a novel Fe-doped AgBr microsphere photocatalyst was synthesized. The analysis of XRD, XPS, ICP and SEM distinctly demonstrated that the Fe ions were successfully doped into AgBr lattice. Under simulated solar light, the photocatalytic performance of organic contaminants rhodamine B (RhB) and ciprofloxacin (CIP) was considerably improved by Fe-doped AgBr. Notably, FA-3 (the molar ratio of Fe/Ag was 0.18 %), as the optimal photocatalyst, degraded nearly 100 % of RhB within 40 min, while AgBr only degraded 35 % of RhB. Moreover, the sample performed significantly enhanced mineralization ability, excellent degradation performance under different initial PH conditions, and stable photocatalytic ability after three cycles. Doping Fe ions modified the band structure of AgBr, introduced impurity levels to provide new electron transfer channels, and promoted the charge separation and transfer in AgBr semiconductors. This work provides an idea for the efficient degradation of organic pollutants by doping metal cations modified semiconductor photocatalysts.
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
高影响因子
ACS Applied Nano Materials
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2021
·
IF 5.097
Xiaoru Gao,Jinfeng Wang,Qihui Xue,Yuan-Yuan Ma,Yuanzhe Gao
The exploration of high efficient and stable visible light-driven photocatalysts for water splitting into green energy hydrogen has been considered as one of the currently most challenging topics for solving the energy crisis and environmental remediation. In this paper, a series of ternary AgBr/polyoxometalate/graphene oxide (AgBr/POM/GO) composites (POMs = {PMo12}, {PW12}, {SiW12}, {P2W18}, and {P2Mo18}) were synthesized via an ionic liquid-assisted hydrothermal method. The successful combination of ternary AgBr/POM/GO composites has been determined by a series of techniques. In addition, such ternary nanocomposites displayed wide visible light absorption ranges. Photocatalytic experiments demonstrate that such AgBr/POM/GO ternary composites display remarkable photocatalytic activity for hydrogen production, and the photocatalytic performance can be regulated by the species of POMs. Under minimally optimized conditions, the average hydrogen evolution rates were 256.0 μmol g–1 h–1 for AgBr/PMo12/GO, 223.2 μmol g–1 h–1 for AgBr/PW12/GO, 212.0 μmol g–1 h–1 for AgBr/SiW12/GO, 207.2 μmol g–1 h–1 for AgBr/P2W18/GO, and 177.2 μmol g–1 h–1 for AgBr/P2Mo18/GO, respectively. Both AgBr and POMs can be excited under the irradiation, greatly improving the visible light adsorption of the nanocomposites. Moreover, the adoption of POMs enhances the photochemical performance of the ternary nanocomposites because of their excellent redox properties and good photogenerated-electron/holes generation capacities. This work presents an efficient POM-based photocatalyst system for photocatalytic hydrogen production, which may provide important guidance for the design and exploration of efficient photocatalytic materials.
研究领域:
材料科学
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能源化学
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环境科学
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产品关联
DOI
高影响因子
Biomedical Materials
·
2022
·Vol. 17
·期 2
·025005
·
IF 4.103
Bo Li,Hong Li,Haocheng Yang,Yue Shu,Kejiang Li,Ke Chen,Wenqian Xiao,Xiaoling Liao
Pure gelatin hydrogels lack antibacterial function and have poor mechanical properties, which restrict their application in wound dressings. In this study, nanosized silver bromide-doped mesoporous silica (AgBr@SiO2) microspheres with hollow structures were prepared by a modified Stober method. The novel microspheres can not only release silver ions to treat bacteria but also release drugs to treat skin wound. Furthermore, AgBr@SiO2 microspheres were modified with propyl methacrylate, incorporated into methacrylated gelatin (GelMA), and crosslinked by UV light to prepare AgBr@SiO2/GelMA dressings consisting of composite hydrogels. The results showed that the AgBr@SiO2 microspheres could enhance the mechanical properties of the hydrogels. With the increase in the AgBr@SiO2 concentration from 0.5 to 1 mg ml−1, the dressings demonstrated effective antimicrobial activity against both Staphylococcus aureus and Escherichia coli. Furthermore, full-thickness skin wounds in vivo wound healing studies with Sprague–Dawley rats were evaluated. When treated with AgBr@SiO2/GelMA containing 1 mg ml−1 AgBr@SiO2, only 15% of the wound area left on day 10. Histology results also showed the epidermal and dermal layers were better organized. These results suggest that AgBr@SiO2/GelMA-based dressing materials could be promising candidates for wound dressings.
研究领域:
材料科学
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生物医学工程
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药学
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DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2020
·Vol. 20
·期 3
·1936-1940
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IF 1.134
Chen Guochang,Zhu Mingming,Wang Lichun,Wu Xingrong
In this investigation, AgBr/g-C3N4 composite as an effective LED-irradiation photocatalyst was synthesized via a one-pot method. In this composite, the colloidal spheres of AgBr were uniformly dispersed on the g-C3N4 nanosheets, which were
characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffused reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The introduction of g-C3N4
nanosheets improved the stability and optimized the spatial charge carrier transfer compared to pristine AgBr, hence exhibited excellent activities toward the degradation of methyl orange (MO) as evidenced by the discoloration rate of MO by 94.8% after 120 min of irradiation. Also, the mechanism
based on the band structures and microstructures of the catalysts was then proposed.
研究领域:
材料科学
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环境科学
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光化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 11
·1-13
·
IF 2.8
Liu Jinsong,Sun Zhongbao,Wu Zhengying,Huang Yanfang,Zhu Kongjun,Zheng Hongjuan,Wang Jie,Chen Jiankang
AgBr/Bi 2 SiO 5 photocatalyst with Z-scheme structure was obtained via a hydrothermal reaction, calcination, and in situ precipitation process. The as-prepared AgBr/Bi 2 SiO 5 composite photocatalytically degraded 96.2% of RhB under visible light irradiation within 30 min. Moreover, the photodegradation efficiency remained above 81.7% after being reused five times. Trapping experiments revealed that ·O 2− was the main reactive species during RhB photodegradation. The degradation mechanism study of AgBr/Bi 2 SiO 5 showed that the Z-scheme structure between AgBr and Bi 2 SiO 5 facilitated the separation of charge carriers, thereby improving the photocatalytic degradation with the assistance of a dye sensitization effect. This work provides a reference for developing other Z-scheme photocatalysts for the removal of 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
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Pengfei Zhu,Shasha Zhang,Mei Liu,Ming Duan,Zhaoxin Huang,Han Lu
Herein, a novel Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 double Z-scheme heterojunction photocatalytic material was synthesized by the ultrasonic-assisted coprecipitation method. When the content of AgBr in Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 is 30 wt% and the content of Ag 4 V 2 O 7 is 1 wt%, under the optimized reaction conditions, the degradation rate of Bi 2 WO 6 /AgBr/Ag 4 V 2 O 7 to oxytetracycline (OTC) reached 88.13 % within 60 min, and the photocatalytic activity decreased only slightly after repeated use for three times, other than that, the toxicity of OTC to wheat decreased significantly after degradation. The morphology, composition, crystal structure and visible light absorption capacity of the samples are investigated by a series of characterization techniques. Furthermore, free radical capture experiment, electron paramagnetic resonance (EPR) experiment and liquid chromatography-mass spectrometry (LC-MS) were used to explore the possible photocatalytic mechanism and degradation path of OTC. The results show that the improvement of photocatalytic activity is attributed to the construction of a double Z-scheme heterojunction, which provides a more effective structural space for the separation of photogenerated e - -h + pairs. This study provides a new idea for the separation of photogenerated e - -h + pairs and broadens the response range of visible light, and proposes a new strategy for the environmental treatment of photocatalysts.
研究领域:
环境科学
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材料科学
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生物学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Pengfei Wang,Yao Liu,Ning Jiang,Ruisen Jing,Shutao Li,Qian Zhang,Huiqiang Liu,Junshan Xiu,Zhao Li,Yunyan Liu
A ternary heterojunction composite photocatalyst g-C 3 N 4 /AgBr/black phosphorus was constructed by co-modifying AgBr with g-C 3 N 4 (CN) and black phosphorus nanosheets (BPNs). The photoluminescence (PL), photocurrent intensity and electrochemical impedance spectroscopy (EIS) results proved that, compared with bare AgBr and binary CN/AgBr and AgBr/BPNs, ternary CN/AgBr/BPNs effectively promoted the separation and suppresses the recombination of electron-hole pair. The photocatalytic experiment proved that the CN/AgBr/BPNs photocatalyst exhibited almost 8 times for degradation rate of MO，and well above those of binary CN/AgBr and AgBr/BPNs. According to trapping experiments of the active species, the analysis of the energy band , we proposed the double S-scheme to explain the charge transfer and the boosting of photocatalytic activity in ternary CN/AgBr/BPNs. Impressively, this double S-scheme facilitated the transmittance of electrons at the CB position of AgBr to the VB of CN and BPNs, and greatly overcome the light corrosion and enhance the stability of AgBr. This work designed a novel S-scheme mechanism heterojunction photocatalytic material, which provides a convenient way for efficient wastewater treatment.
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
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Junlong Zhang,Jie Wei,Jianting Li,Minchuan Xiahou,Zehao Sun,Ao Cao,Youxin Yuanfeng,Guogang Chen,Yanchun He
The indiscriminate discharge of micropollutants ( e.g. , dyes, antibiotics, industrial additives, etc .) represents a significant risk to human health, and the removal of these substances from water bodies has become a prominent area of research within the field of environmental remediation. A simple hydrothermal-precipitation-photoreduction method was employed to synthesize novel Z-scheme heterojunction photocatalysts of AgBr/CoWO 4 /Ag. The catalysts demonstrated remarkable degradation capabilities with regard to a range of micropollutants present in wastewater. Of the catalysts tested, 5AgBr/CoWO 4 /Ag exhibited the highest degradation rates, reaching 98.58% for Rhodamine B, 86.82% for tetracycline hydrochloride, and 95.60% for 2-mercaptobenzothiazole within 60 min. In particular, the reaction kinetic rate of 5AgBr/CoWO 4 /Ag towards Rhodamine B degradation ( k 2 = 0.26278 L mg −1 ·min −1 ) is 9 times that of AgBr ( k 2 = 0.02953 L mg −1 ·min −1 ) and 113 times that of CoWO 4 ( k 2 = 0.00233 L mg −1 ·min −1 ), which serves to highlight the exceptional photocatalytic activity of the material. The experimental data and subsequent analysis indicated that the enhanced photocatalytic performance can be attributed to two factors: firstly, the electron mediation by Ag nanoparticles leading to improved charge separation efficiency, and secondly, the formation of Z-scheme heterojunctions between AgBr and CoWO 4 . The cyclic tests provided confirmation of the excellent stability and recyclability of the AgBr/CoWO 4 /Ag photocatalysts. It is anticipated that this study will facilitate the development of novel methods for the degradation of refractory micropollutants and provide insights into environmental remediation, thereby contributing to the sustainable development of society.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yiying Yue,Kaiyang Hou,Jiayue Chen,Wanli Cheng,Qinglin Wu,Jingquan Han,Jianchun Jiang
A nanofiltration (NF) membrane containing a NaOH-treated electrospun polyacrylonitrile (HPAN) substrate, an interfacial polymerization (IP) polyamide (PA) layer, a chitosan (CS) coating layer, and an Ag/AgBr/AgVO3 photocatalyst loading layer was prepared. The structural evolution of the membranes was investigated, and their performance was estimated in accordance with the water flux and rejection rate. A probable mechanism for the photocatalytic activity of Ag/AgBr/AgVO3 was proposed. The loading of the Ag/AgBr/AgVO3 heterojunction on the HPAN/PA/CS NF membrane endowed the membrane with excellent self-cleaning properties owing to the photolytic degradation of the dye. The filtration and degradation processes of the Ag/AgBr/AgVO3-loaded membrane constantly promoted each other, and the treatment efficiency achieved with the integrated (filtration + degradation) process was superior to those obtained with the filtration and degradation processes alone. The Ag/AgBr/AgVO3-NF membrane exhibited excellent recyclability and stability when subjected to five integrated filtration–degradation processes. In addition, the Ag/AgBr/AgVO3-NF membrane exhibited an elastic modulus of 65.75 MPa and a toughness of 38.9 kJ/m3 along with a good disinfection effect on Escherichia coli in visible light. The as-prepared photocatalyst-loaded NF membrane with excellent antifouling performance, antimicrobial activity, high strength, and recyclability showed potential for continuous water purification operation.
研究领域:
材料科学
·
环境科学
·
生物医学工程
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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）