Journal of Environmental Chemical Engineering
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2016
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IF 0
Xiuzhen Lin,Hong Liu,Bing Guo,Xinhai Zhang
In this research, AgCl/Ag/AgCl core-shell microstructures have been synthesized at room temperature through a facile in situ method. The as-synthesized unique microstructures were characterized by SEM-EDS, XRD, XPS, UV–vis diffuse reflectance spectroscopy. And their photocatalytic activities were evaluated by degradation of methyl orange (MO) under UV, visible and sunlight irradiation. Comparing with the commercially available P25-TiO 2 and AgCl/Ag core-shell microstructures, our as-prepared samples gave the highest reactivity (almost 100% decomposition in 20 min) under direct sunlight irradiation. Their excellent photocatalytic activities are ascribed to the unique three-layered AgCl/Ag/AgCl core-shell microstructures, leading to improved electron-hole (e − -h + ) separation efficiency and promoting the inside charge carriers promptly transferred to the surfaces. In addition, their photocatalytic activity did not show any loss after four-time recycles, revealing high stability. In brief, the as-synthesized three-layered AgCl/Ag/AgCl core-shell microstructures exhibit their promising potential as efficient sunlight-driven photocatalysts for organic pollutants degradation.
研究领域:
材料科学
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环境科学
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DOI
Crystals
·
2019
·Vol. 9
·期 8
·401
·
IF 2.061
Yuxiang Lu,Yazhou Qin,Dongdong Yu,Jianguang Zhou
In this work, we have synthesized hexapods AgCl crystals with mace pods for the first time. Diallyldimethylammonium chloride (DDA)-controlled stepwise evolution of AgCl crystals from octahedron to hexapods with mace pods are achieved by one-pot method. The intermediates have been captured which show the basic process of crystal growth. In this process, octahedra AgCl crystals firstly grow along the <100> direction and then change to grow in the <110> direction. At the same time, the size of AgCl grow from 2 μm to 20 μm. Due to the poor absorption of visible light by AgCl, sodium borohydride(NaBH4) is used to reduce AgCl hexapods with mace pods crystals. By changing the mole ratio(R) of NaBH4to AgCl, the new structure was reduced to obtain a series of Ag@AgCl microstructures. Visible light catalysis effects of the Ag@AgCl microstructures on degradation of methyl orange (MO) were investigated. The Ag@AgCl microstructures with R = 0.02 have a high photocatalytic performance, which completely degrades MO in 40 min.Keywords:hexapod AgCl;one-pot method;Ag@AgCl microstructure;MO degradation
研究领域:
材料科学
·
光催化
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DOI
高影响因子
Crystals
·
2025
·Vol. 15
·期 5
·451
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IF 2.4
Chunli Cai,Qian Wang,Changsheng Yin,Xuhuan Li,Rong Yang,Xiaodong Shen,Wenbo Xin
AgCl microcrystals are used in visible light photocatalysis. However, their properties depend strongly on the morphology of the crystals and the degree of exposure of the crystal planes. Despite extensive research conducted on the synthesis of AgCl microcrystals, the majority of existing studies have focused on the stable growth of crystals. The role of Cl−ions concentration as a key factor controlling the microcrystals morphology has not been fully explored, which limits the precise tuning of the morphology of AgCl microcrystals. In this study, AgCl microcrystals with controllable morphology are successfully synthesized by a facile solvothermal method. During the preparation process, ethylene glycol (EG) is utilized as a solvent, while polyvinylpyrrolidone (PVP) is employed as a surfactant. We systematically investigate the etching mechanism of AgCl microcrystals by analyzing the effect of sodium chloride (NaCl) concentration on their morphology. This investigation involves the integration of diverse characterization methods, including scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and geometrical struc-ture analysis. The results demonstrate that Cl−functions as both a surfactant, thereby promoting the nucleation of cubic microcrystals, and as an etchant, selectively etching the crystal surface. The order of selective etching on the crystal surface follows (100) planes > (110) planes > (111) planes. Based on this new mechanism, AgCl microcrystals with various morphologies, such as cube, octopod and dendrite, are successfully prepared, which provides a new idea for the precise design of noble metal halide microcrystals.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
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IF 2.446
Xiaojuan Zhao,Hongda Cui,Tianhe Wang
We report a novel Bi 2 Sn 2 O 7 /Ag-AgCl photocatalysts with excellent visible-light-driven photocatalytic properties. The crystalline Bi 2 Sn 2 O 7 was synthesized by solid-state reaction at 550 °C. Then Bi 2 Sn 2 O 7 /Ag-AgCl was prepared using deposition-precipitation technique followed by photo-reduction of partial Ag + to Ag 0 nanoparticles on surface of AgCl. The photocatalysis were evaluated by degrading organic dyes under controlled conditions. The Bi 2 Sn 2 O 7 /Ag-AgCl composite exhibited a much improved photocatalysis, approximately 7 times stronger than that of pure Bi 2 Sn 2 O 7 , primarily due to its enhanced visible-light absorption and high separation efficiency of charge. On the basis of band structure analysis, a possible mechanism of photocatalysis enhancement for Bi 2 Sn 2 O 7 /Ag-AgCl is proposed. The strong photocatalytic capability, together with simplicity of fabrication suggests Bi 2 Sn 2 O 7 /Ag-AgCl composite provided in this study may have certain practical applications in water treatments. Additionally, the study implies a novel but simple methodology that may be also applicable in construction of other types of single semiconductor/plasmonic composite photocatalysts.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Qiaoqi Guo,Ying Luo,Jun Xu,Lidan Deng,Zheng Wang,Hong He
Photocatalytic conversion of low-concentration CO 2 with H 2 O oxidation indicates an applicable way to achieve sustainable carbon cycling and solve the global warming problem. Enhancing photogenerated charge separation and surface adsorption and catalytic process of photocatalysts is the crucial point to compensate for the mass transfer limitation during low-concentration CO 2 conversion. Herein, a highly-crystalline Ag x Na 1−x TaO 3 -AgCl heterostructure composite was successfully fabricated via a one-step flux method. The in-situ formation of intimate heterojunction between Ag x Na 1−x TaO 3 and AgCl facilitated the separation and transfer of photogenerated charges. Moreover, the simultaneous introduction of Ag cations and AgCl components promoted the adsorption and activation of CO 2 on the photocatalyst surface. When combined with metallic Ag cocatalysts, the Ag x Na 1−x TaO 3 -AgCl heterostructure photocatalyst exhibited an improved activity for the overall reaction of CO 2 reduction and H 2 O oxidation at low CO 2 concentration condition. The design of photocatalysts active at low CO 2 concentration accounts for an alternative way to construct the practical CO 2 conversion system in the future.
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
MATERIALS CHEMISTRY AND PHYSICS
·
2023
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IF 4.6
Yinghua Li,Wenyue Yin,Ning Yang,Yuxin Li,Chaoqun Zhu,Lu Liu,Haibo Li,Xi Chen
A kind of easily recyclable and composite photocatalyst based on Ag/AgCl/Bi 2 O 3 /BiFeO 3 (AABB) and modified zeolite (MZ)/activated carbon (AC) were made, and investigated for the degradation of levofloxacin hydrochloride (Lev-HCl) in wastewater. The structures and morphologies of AABB@loading materials were firstly characterized. The results showed that under visible light , the optimal conditions for photodegradation were: mass ratio of MZ to AABB 3:2, AABB@MZ dosage 1–1.2 g/L, initial concentration of Lev-HCl <18 mg/L. Under these conditions, 72.09%∼ Lev-HCl could be degraded within 1.5 h. In addition, AABB@MZ could be easily recovered by gravity settling for 30 min and reused three times with 74.7% recovery rate. Photoluminescence (PL) combined with electron paramagnetic resonance (EPR) showed that photocatalysts mainly produced ·O 2 − and ·OH, which played a major role in the degradation process. Finally, a possible catalytic mechanism for AABB@MZ was suggested.
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 PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
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IF 2.891
Zhongyi Jiao,Junlei Zhang,Zhendong Liu,Zhen Ma
Ag 2 MoO 4 shows low photocatalytic activity under visible light. It would be interesting to develop Ag 2 MoO 4 -based composite/heterojunction photocatalysts working efficiently under visible light. Herein, novel Ag/AgCl/Ag 2 MoO 4 composites were obtained via photoreduction of AgCl/Ag 2 MoO 4 composites prepared by sequential precipitation. The composition, morphologies, and optical properties of the samples were studied via various characterization techniques. Photocatalytic degradation of rhodamine B (RhB), methylene blue (MB), methyl orange (MO), norfloxacin (NOF), and tetracycline hydrochloride (TC) solutions was conducted under visible-light irradiation. An optimal Ag/AgCl/Ag 2 MoO 4 catalyst showed much higher photocatalytic activity than Ag 2 MoO 4 , and it also showed reasonably fine recyclability. Through radical-capturing experiments, photogenerated holes (h + ) were determined to be the main active species whereas hydroxyl radicals ( OH) were found to play a secondary role in photocatalysis. Possible photocatalytic mechanisms were proposed.
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
COMPOSITES PART B-ENGINEERING
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2018
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IF 4.92
Chunwang Yi,Jingkai Liu,Deqian Meng,Jing Lv,Xiaomin Zhang,You shu,Shengpei Su,Jin Zhu
A chitin-fastening Ag@AgCl composite film with decontamination properties was successfully prepared by one-step coagulation method of the chitin- LiCl/Dimethyl Acetamide (DMAc) solution with AgNO 3 . In this process, AgCl was formed in a chitin solution with the addition of AgNO 3 solution, and with the help of excess Cl − a solution of AgCl was formed. AgCl nanocrystals embedded on the surface of chitin were obtained after the solution was put into coagulation bath . The AgCl nano-crystals embedded on the surface of chitin film could be partly transformed into the Ag@AgCl by appropriate visible-light irradiation in the air. In order to explore the morphology and the formation mechanism of the composites, the well-prepared films were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), X-ray photo-electron spectroscopy (XPS), thermogravimetric analysis (TGA), ultraviolet spectro-photometry and UV–visible absorption spectrum . The decontamination ability and recyclability of composite film was evaluated by the degradation rate of methyl orange (MO) in recycling process. By comparison, the Ag@AgCl fastened in chitin matrix was more stable than fastened by cellulose matrix. Its photo-degradation efficiency could be still retained up to 95% after 5-cycle testing. Meanwhile, the composite film could be also kept excellent mechanical properties. This work provided a simple pathway to construct the functional chitin film which could be applied as a kind of stable recycling decontamination materials.
研究领域:
材料科学
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环境科学
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生物化学
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DOI
高影响因子
Chemical Science
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2022
·Vol. 13
·期 16
·4616-4622
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IF 9.969
Jianxin Zhai,Baowen Zhou,Haihong Wu,Shuaiqiang Jia,Mengen Chu,Shitao Han,Wei Xia,Mingyuan He,Buxing Han
Design of active catalysts for chemical utilization of methane under mild conditions is of great importance, but remains a challenging task. Here, we prepared a Ag/AgCl with SiO2 coating (Ag/AgCl@SiO2) photocatalyst for methane oxidation to carbon monoxide. High carbon monoxide production (2.3 μmol h−1) and high selectivity (73%) were achieved. SiO2 plays a key role in the superior performance by increasing the lifetime of the photogenerated charge carriers. Based on a set of semi in situ infrared spectroscopy, electron paramagnetic resonance, and electronic property characterization studies, it is revealed that CH4 is effectively and selectively oxidized to CO by the in situ formation of singlet 1O2via the key intermediate of COOH*. Further study showed that the Ag/AgCl@SiO2 catalyst could also drive valuable conversion using real sunlight under ambient conditions. As far we know, this is the first work on the application of SiO2 modified Ag/AgCl in the methane oxidation reaction.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 75
·61239-61248
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IF 3.84
Jun Liu,Wei Wu,Qingyong Tian,Shuanglei Yang,Lingling Sun,Xiangheng Xiao,Feng Ren,Changzhong Jiang,Vellaisamy A. L. Roy
Plasmonic photocatalysts coupled with semiconductors are one of the most popular combinations in environmental remediation applications. In this regard, a novel tube-like α-Fe2O3@Ag/AgCl hybrid structure is fabricated by anchoring Ag/AgCl hybrid nanoparticles on the surface of α-Fe2O3 short nanotubes (SNTs) by a step-by-step strategy. Firstly, the monodispersed α-Fe2O3 SNTs have been synthesized via an anion-assisted hydrothermal process followed by the loading of Ag nanoparticles on the surface of α-Fe2O3 SNTs through the classic silver mirror reaction mechanism. From in situ oxidation of Ag nanoparticles, the final product α-Fe2O3@Ag/AgCl heterostructures has been obtained. We study the morphology, composition, and photocatalytic properties of the as obtained tube-like α-Fe2O3@Ag/AgCl nano-heterostructures. The photocatalytic activities of as obtained photocatalysts have been tested by the degradation of organic dye Rhodamine B (RhB) under simulated sunlight (UV + visible light), visible light and UV light irradiation. The main reason for the enhanced photocatalytic performance is attributed to the broad spectral response from the combination of narrow/wide bandgap semiconductors with metallic Ag nanoparticles and efficient charge transfer from plasmon-excited Ag nanoparticles to α-Fe2O3 and AgCl. Finally, this hybrid structure provides a roadmap for the controlled synthesis of plasmonic photocatalysts with excellent properties, and can be used for practical application in environmental issues.
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
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 72
·期 3
·200-205
·
IF 1.059
Jianhua Ge,Yuchong Chen,Jing Xu,Yujie Liu,Long Zhang,Fugeng Zha
The plasmonic photocatalyst Ag@AgCl was successfully prepared through a facile solvothermal method via a deep eutectic solvent (DES), which is composed of choline chloride and urea. X-Ray diffraction, scanning electron microscopy, energy-dispersive X-ray, element-mapping, X-ray photoelectron spectroscopy, N2 absorption–desorption, and UV-vis diffuse reflectance techniques were adopted to analyse the performance of the plasmonic photocatalyst. Characterisation results indicated that the DES not only served as a solvent and Cl source, but also as a reductant. Meanwhile, the probable mechanism for the formation of Ag@AgCl is discussed, which revealed a visible light enhanced photocatalytic property for the degradation of benzidine. Furthermore, the photocatalyst showed no decrease in its catalytic activity even after five cycles of operation. Finally, a possible photocatalytic oxidation mechanism of Ag@AgCl is proposed.
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 ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Changlin Yu,Fanyun Chen,Zhen Liu,Kai Yang,Hongbing Ji,Dehao Li,Wenyu Xie,Shaoyu Li
A series of robust AgCl/WO 3 composite microrods (0.1–0.2 μ m) with different Ag/W molar ratios (0.25, 0.50, 0.75, 1.00, 1.25) were synthesized via hydrothermal-calcination process. The obtained samples were characterized by XRD , SEM, TEM , FT-IR, UV-vis DRS, PL , BET, Raman, transient TPRT and EIS . The photocatalytic test for organic dyes degradation showed that AgCl/WO 3 microrods possess much higher photocatalytic activities and stability than bare AgCl and WO 3 . With optimal AgCl/WO 3 molar ratio (0.75 ∼ 1), 2 ∼ 5 times increase in dye decomposition efficiency was obtained over AgCl/WO 3 microrods. The formation of intimate WO 3 /AgCl heterojuction (interface) largely enhanced the separation efficiency of photogenerated carriers. This investigation suggested that AgCl/WO 3 microrods could a promising photocatalyst for environmental remediation.
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
危险品化学品经营许可证（带存储）