APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Wei Li,Qiong Ma,Xiao Wang,Shu-ao He,Min Li,Longfang Ren
Due to the increasing pressure of social environment and the increasing demand of human for energy, it is urgent to seek a sustainable and pollution-free new energy. Hydrogen is considered as a new type of energy because of its high calorific value , no environmental pollution and low cost of raw materials. In this experiment, to improve the visible-light driven catalytic activity of two-dimensional g-C 3 N 4 , g-C 3 N 4 and Ag/AgBr nanoparticles (NPs) were used as the carrier and cocatalyst, and the g-C 3 N 4 /Ag/AgBr (CNAA-α, α = 1, 2 and 3) heterojunction photocatalysts with different amounts of Ag/AgBr were synthesized via solvothermal technology. The morphology, composition , structure, photochemical and electrochemical characteristics of the samples were analyzed through XRD , FTIR , TEM , XPS and a series of photoelectrochemical characterizations, and the visible-light driven catalytic hydrogen evolution activities of the samples were studied by catalyzing water splitting. Research showed that the CNAA-2 exhibited the smallest overvoltage (86.5 mV vs RHE) and Tafel slope (61.0 mV·dec −1 ), so that the highest photocatalytic activity (47.84 μmol·g −1 ·h −1 ) for hydrogen evolution was obtained at the absence of Pt co-catalyst. Furthermore, this heterojunction photocatalyst exhibited good photostability and could be recycled several times with no significant decrease of its activity. This indicated that the addition of Ag/AgBr NPs to the two-dimensional g-C 3 N 4 nanosheets to construct an effective p-n heterojunction system at their interfaces could promote the conduction of photo-induced carriers and inhibit their combination, so that it would significantly improve the photoresponse ability and catalytic activity of two-dimensional g-C 3 N 4 nanosheets.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Zhang Siyang,Khan Iltaf,Qin Xiaohong,Qi Kezhen,Liu Ying,Bai Shuchong
In this work, the highly efficient and low-cost Ag-AgBr/AlOOH plasmonic photocatalyst is successfully prepared via a simple and mild wet-chemical process and used for degrading high concentration methylene blue (MB) and tetracycline hydrochloride (TCH). The optimized 6-Ag-AgBr/AlOOH sample showed a 79% decomposition of TCH in 2 h, which is almost two times higher than that of bare AgBr (37%). For degrading MB, the photocatalytic activity of 6-Ag-AgBr/AlOOH (decomposing 84% in 2 h) showed a large enhancement as compared to bare AgBr (only 57%). The TEM, HRTEM, XRD, DRS, and XPS characterization results confirm that Ag-AgBr is a composite catalyst formed by loading Ag nanoparticles onto AgBr surfaces and then loaded on to AlOOH. The possible mechanism proposed is that •O2- and •OH radicals produced under sun light are the main active species for degrading MB and TCH. It is hoped that this work will open a new gateway to the synthesis of highly efficient and low-cost Ag-AgBr/AlOOH plasmonic photocatalysts for degrading 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
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 4
·892-901
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IF 4.204
Wang Yixing,Dai Liheng,Qu Kai,Qin Lu,Zhuang Linzhou,Yang Hu,Xu Zhi
Photocatalytic membranes have received increasing attention due to their excellent separation and photodegradation of organic contaminants in wastewater. Herein, we bound Ag-AgBr nanoparticles onto a synthesized polyacrylonitrile-ethanolamine (PAN-ETA) membrane with the aid of a chitosan (CS)-TiO 2 layer via vacuum filtration and in-situ partial reduction. The introduction of the CS-TiO 2 layer improved surface hydrophilicity and provided attachment sites for the Ag-AgBr nanoparticles. The PAN-ETA/CS-TiO 2 /Ag-AgBr photocatalytic membranes showed a relatively high water permeation flux (~ 47 L·m −2 ·h −1 ·bar −1 ) and dyes rejection (methyl orange: 88.22%; congo red: 95%; methyl blue: 97.41%; rose bengal: 99.98%). Additionally, the composite membranes exhibited potential long-term stability for dye/salt separation (dye rejection: ~97%; salt rejection: ~6.5%). Moreover, the methylene blue and rhodamine B solutions (20 mL, 10 mg · L −1 ) were degraded approximately 90.75% and 96.81% in batch mode via the synthesized photocatalytic membranes under visible light irradiation for 30 min. This study provides a feasible method for the combination of polymeric membranes and inorganic catalytic materials.
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
RESEARCH ON CHEMICAL INTERMEDIATES
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2019
·Vol. 46
·期 1
·149-164
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IF 2.064
Sun Jialin,Dai Jingtao,Liu Rui,Yang Xiaowei,Chen Jian
To improve the visible-light catalytic performance of TiO 2 for practical application, Ag/AgBr modified TiO 2 was fabricated in ionic liquid–water medium via a facile hydrothermal reduction method. Imidacloprid (IMI) was employed as the target pollutant to evaluate the critical impacts on the catalytic activity of as-prepared Ag/AgBr/TiO 2 , where the factors relating to the catalyst (composition, dosage, recycle and reuse) and solution chemistry (pH and concentration, simulated wastewater samples and floodwater of rice paddy field) were studied. The results suggested that benefitting from visible-light sensitive Ag/AgBr and high specific surface area TiO 2 , Ag/AgBr/TiO 2 exhibits superior visible-light photocatalytic activity and stability to Ag/AgBr and TiO 2 . The quenching tests with various scavengers indicate that · O 2 − and h + , and · O 2 − and · OH may be the key roles in IMI photo-degradation on Ag/AgBr and on Ag/AgBr/TiO 2 , respectively. Thus, the photocatalytic performance of Ag/AgBr/TiO 2 differs from that of Ag/AgBr. Furthermore, the contribution of such active species is clarified for quantitative mechanisms study. The photo-degradation conducted in the simulated wastewater and the floodwater of rice paddy field proves favorable anti-interference capacity of Ag/AgBr/TiO 2 . The tests conducted on real wastewater sample verified that Ag/AgBr/TiO 2 can mineralize IMI promptly and almost completely.
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
ELECTROCHIMICA ACTA
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2018
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IF 5.116
Wei Li,Shu-ao He,Wei Xu,Ji Li,Xue-chuan Wang
In this research, a series of BiOCl-Ag/AgBr x (BAA x ) heterojunctions with surface plasmon resonance (SPR) effect of metallic Ag were synthesized by a facile one-pot solvothermal method . For the superior photosensitive effect of AgBr co-catalyst, all BAA x samples exhibited much enhanced response to visible light. For the formation of BiOCl-AgBr heterojunction and existence of metallic Ag plasma, the BAA x photocatalysts exhibited very superior interfacial charge migration, and the recombination of photoexcited electron-hole pairs could be effectively controlled. Research showed that the BAA 0.04 heterojunction exhibited the highest photocatalytic activity under visible light irradiation , and various pollutants in water system could be decomposed effectively. Furthermore, the BAA 0.04 heterojunction possessed very robust photostability, its crystal structure and photocatalytic activity almost remained unchanged after being used several times.
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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2019
·Vol. 30
·期 16
·15754-15765
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IF 2.195
Sun Jialin,Huang Dejia,Liu Rui,Dai Jingtao,Chen Jian
To improve the visible-light photocatalytic performance of TiO 2 for practical application, Ag/AgBr modified TiO 2 was fabricated in ionic liquid–water medium via a facile hydrothermal-reduction method. The visible-light catalytic activity of as-prepared Ag/AgBr/TiO 2 was measured using tetracycline (TC) as the target pollutant. Characterizations by various techniques (SEM–EDS, XRD, XPS and DRS) and the quenching experiments with scavengers for possible active species (h + , • O 2 − and ·OH) were executed to probe the mechanism underlying the photocatalytic performance. Critical impacts from the catalyst and solution chemistry were evaluated in the mediums of TC solution, simulated wastewater and real wastewater sample. The results suggested that: (1) benefitting from the visible-light sensitive Ag/AgBr and high specific surface area TiO 2 , Ag/AgBr/TiO 2 exhibits fair stability and remarkable visible-light photocatalytic activity; (2) under optimized conditions, Ag/AgBr/TiO 2 provides higher visible-light catalytic activity than Ag/AgBr and TiO 2 ; (3) the coexisting inorganic ions with high concentration in the simulated wastewater sample depress TC photo-degradation, and the impacts varies with the species of inorganic ions; (4) COD removal rate about 65.5% in real wastewater sample proves that Ag/AgBr/TiO 2 can mineralize TC promptly and almost completely.
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
Catalysis Science & Technology
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2022
·Vol. 12
·期 5
·1628-1636
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IF 6.177
Peng Gao,Peng Wang,Xiaolei Liu,Zihao Cui,Yaqiang Wu,Xiaohan Zhang,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang
Dry reforming of CH4 by photothermal catalysis is considered to be a promising approach to produce syngas. It can not only store useful chemical energy, but also consume CO2 and CH4 to mitigate the greenhouse effect. Herein, we anchor Ag/AgBr on CsPbBr3 through an in situ ion exchange route to construct a composite material, which exhibits an excellent photothermal synergistic effect in the dry reforming of CH4. The CO production rate of the 7 wt% Ag/AgBr/CsPbBr3 composite through photothermal catalysis is 456.15 μmol g−1 h−1, which is approximately 79 times and 195 times higher than that through pure thermal catalysis and pure photocatalysis, respectively. Moreover, the CO production rate of 7 wt% Ag/AgBr/CsPbBr3 is 7.25 times higher than that of pristine CsPbBr3. The mutual promotion of the thermochemical and photochemical processes significantly improves the energy utilization efficiency and reaction kinetics, leading to high photothermal catalytic efficiency. This work indicates that the inorganic halide perovskite shows excellent photothermal catalytic activity, and provides an alternative way to extend the application range of perovskite materials.
研究领域:
催化化学
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能源材料科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
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2017
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IF 0
Qing Liu,Zebin Yu,Mingjie Li,Yanping Hou,Lei Sun,Li Wang,Zhenbo Peng,Dongmei Chen,Yuxin Liu
A novel Ag/AgBr/Ga 2 O 3 composite with heterojunction microstructure was synthesized by using chemical deposition followed by UV reduction method. High resolution transmission electron microscopy showed that Ga 2 O 3 microparticles were tightly attached with Ag/AgBr to form a heterojunction. UV–vis diffuse reflectance spectra revealed that light response capability of Ga 2 O 3 was enhanced significantly when combined with Ag/AgBr. The degradation efficiency of methyl orange within 30 min under UV light irradiation with Ag/AgBr/Ga 2 O 3 , Ag/AgBr and Ga 2 O 3 were 89%, 74% and 48%, respectively. Ag/AgBr/Ga 2 O 3 not only showed excellent photocatalytic activity under UV light, but also exhibited efficient photocatalysis capacity under visible light. Furthermore, the mechanism of charge separation in the heterojunction under UV light irradiation was proposed.
研究领域:
材料科学
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化学
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环境科学
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产品关联
DOI
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Yanping Zhu,Runliang Zhu,Lixia Yan,Haoyang Fu,Yunfei Xi,Huijun Zhou,Gangqiang Zhu,Jianxi Zhu,Hongping He
Herein, we have reported an effective strategy to solve the rate-limiting step in a heterogeneous Fenton reaction, i.e., the generation of Fe(II) from Fe(III), which also inevitably consumes a large amount of H 2 O 2 . For the first time, a novel heterogeneous photo-Fenton catalyst - Ag/AgBr/ferrihydrite (Ag/AgBr/Fh) was successfully developed by combing AgBr with ferrihydrite (Fh) and then in-situ generating Ag nanoparticles on the surface of AgBr/Fh. This strategy can introduce photo-generated electrons from semiconductor-based plasmonic photocatalysts to heterogeneous Fenton catalysts and significantly increase the efficiency to degrade contaminants. The presence of both AgBr and Ag nanoparticles was proved by a combination of structural characterization studies (i.e., XRD, SEM, TEM, and XPS). Under visible light irradiation, the generated Fe(II) on the samples and the degradation rate constants of bisphenol A (BPA) followed the same order: Ag/AgBr/Fh > AgBr/Fh > Fh, which could be attributed to the accelerated reduction of Fe(III) to Fe(II) by the photo-generated electrons from AgBr and Ag nanoparticles, and also profit from the strong electron trapping ability of Ag nanoparticles in separating the electron-hole pairs of AgBr. The Ag/AgBr/Fh system could produce more hydroxyl radicals (•OH), and its catalytic performance was less affected by decreasing H 2 O 2 concentration, which suggested a more efficient utilization of H 2 O 2 . The Ag/AgBr/Fh system exhibits relatively high photo-Fenton reactivity even at neutral pH. In addition, a much lower Fe 3+ dissolution indicates that a large portion of the contribution is from the direct heterogeneous Fenton reaction in this system.
研究领域:
环境科学
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催化
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光化学
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水处理
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产品关联
DOI
高影响因子
RSC Advances
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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
✓ 已验证
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
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环境科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·14180-14188
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IF 3.288
Jingjing Zhang,Jingtao Dai,Jian Chen
To compare photodegradation processes in single- and binary-contaminant systems, a representative antibiotic (tetracycline) and insecticide (imidacloprid) were employed as two contaminants of emerging concern. Ag/AgBr modified BiOBr was synthesized hydrothermally in an ionic-liquid/water medium and characterized via various techniques to support mechanistic studies. As-prepared flower-shaped Ag/AgBr/BiOBr exhibits superior photocatalytic activity to Ag/AgBr and BiOBr. Parallel experiments were conducted in single-contaminant systems to optimize the solution chemistry for comparison studies; these suggested that the photodegradation rate (DR) is highest at 1.0 g L−1 at catalyst dosages ranging from 0.6 to 1.4 g L−1, while raising the initial concentration reduces the DR. Additionally, electrostatic interactions between the reactants and photocatalyst cause DR fluctuations at different pH values. In the mechanistic studies, the contributions of the dominant active species (˙O2− and h+) were analysed quantitatively through quenching tests with scavengers. Furthermore, electrostatic interactions between the reactants and the active species result in non-equilibrated contributions from ˙O2− and h+ in single-contaminant systems. Comparison studies distinctly demonstrated a synergistic effect in binary-contaminant systems, which is caused by the mutually complementary utilization of h+ and ˙O2− during the photodegradation of tetracycline and imidacloprid.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）