Journal of Materiomics
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2018
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IF 0
Qionglian Yang,Mingyu Hu,Jun Guo,Zhenhua Ge,Jing Feng
s Ag/AgCl/TiO 2 nanocomposite was synthesized through the combination of sol-gel process and hydrothermal (HT) method followed by ion exchange method in the paper. Transmission electron microscope, UV–vis absorption property and X-ray diffraction were utilized to characterize the morphology, optical absorption property and phase structure of the as-prepared photocatalysts. The morphological and performance studies of Ag/AgCl/TiO 2 revealed that a well-interconnected mixed phase heterojunction photocatalyst was achieved through as-prepared TiO 2 and the subsequent ion exchange method. By the degradation of Rhodamine B under xenon lamp, Ag/AgCl/TiO 2 exhibited a significant enhancement in photocatalytic activity compared with TiO 2 and Ag/TiO 2 . The band gap of Ag/AgCl/TiO 2 can reach to 2.53eV compared with 3.22eV of the prepared TiO 2 . Furthermore, the synthesis process and photoreaction mechanisms of TiO 2 , Ag/TiO 2 and Ag/AgCl/TiO 2 photocatalysts were proposed. It demonstrated that the enhancement of photocatalytic was mainly due to the reducing of electron-hole recombination in Ag/AgCl/TiO 2 .
研究领域:
材料科学
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环境科学
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DOI
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jian Yang,Lei Li,Fan Fu,Hao Xu,Kang Da,Shaobo Cao,Wenting Chen,Lei Yang,Ximei Fan
As a typical aromatic volatile organic compounds (VOCs), toluene is difficult to be decomposed by photocatalysts under visible-light driven. Herein, the Ag/AgCl/Bi 2 WO 6 heterojunction photocatalysts were synthesized by multi-step process involving chemical deposition of AgCl on the surface of Bi 2 WO 6 and subsequently photoreduction of Ag 0 nanoparticles by UV light. The as-synthesized photocatalysts were characterized by XRD , SEM, TEM, XPS , UV–vis, PL and ESR to investigate the microstructures and electronic structures. The corresponding degradation efficiencies of gaseous toluene were evaluated and the optimal Ag/AgCl/Bi 2 WO 6 exhibited almost 99.9% removal rate after 60 min illumination with visible light (>420 nm). The optical absorption properties and radical trapping experiments revealed the possible energy band structure of Ag/AgCl/Bi 2 WO 6 heterojunction. Finally, the possible enhancement mechanism was also proposed that the cooperation of surface plasmon resonance (SPR) effect, efficient separation of electron-hole pairs, extension of the carrier lifetime as well as the high redox potentials of Z -scheme heterojunction were the primary reasons. Therefore, construction of Z-scheme heterojunction of Ag/AgCl/Bi 2 WO 6 with higher redox ability is an effective way to degradation gaseous toluene under visible-light irradiation.
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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2025
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IF 9
Xiaoxia Liang,Jiakang Duan,Yu Tian,Yue Han,Zewan Qin,Huixia Zhu,Yating Lu,Dongyu Nie,Yingna Guo,Xia Yang
AgCl/Ag 0 shows great promise for the removal of environmental pollutants, while its photocatalytic performance is still a great challenge on account of the agglomeration. Herein, orientational deposited and octahedral AgCl/Ag 0 were obtained by etching the UiO-66-NH 2 template for the first time. The 0.35:1–AgCl/Ag 0 exhibited outstanding efficiency in the degradation of Diazinon (DZN), which was closely 300 times than that of UiO-66-NH 2 and 0.35:1–AgCl@Ag 0 prepared without a template. Its bigger surface area provided more active sites to promote mass transfer efficiency and large amounts of •OH and 1 O 2 were fabricated to offense specific positions of DZN determined through Fukui function. Meanwhile, a high removal rate of 91.0 % was obtained after 5 recycles. Finally, the results of HPLC-MS, T.E.S.T., TOC and IC indicated all intermediates had less toxicity than DZN and were rapidly mineralized. Our work developed a new strategy for designing superb performance AgCl/Ag 0 photocatalysts.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Na Chang,Yan-Ru Chen,Feng Xie,Ya-Pan Liu,Hai-Tao Wang
It is of great importance to fabricate photocatalyst with high photocatalytic activity, and the formation of Z-scheme heterojunction photocatalyst has been proved to be an effective way to restrain the recombination of photo-induced carriers. In this work, Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction is synthesized via a two-step process involving appropriate amount of cationic Ag ion doping into the imidazole ring of ZIF-8 framework and the precipitation of AgCl onto this Ag-doped-ZIF-8. The successful doping of ZIF-8 which decreases the band gap energy, enhances the light harvesting. Besides, the separation efficiency of photo-induced carriers is further improved due to the formation of Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction, which is confirmed by photoelectrochemical experiments. As a result, the as-prepared AgCl/Ag-doped-ZIF-8 photocatalyst possesses excellent photocatalytic activity under visible light illumination. This work will provide a novel perspective for the design and construction of Z-scheme heterojunction for highly efficient photocatalysis.
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 Sciences
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2019
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IF 3.556
Hanlu Shi,Rui He,Lei Sun,Gang Cao,Xiangjuan Yuan,Dongsheng Xia
A series of functional organic–metal AgCl-decorated graphitic carbon nitride (AgCl-CN x ) composites were synthesized and applied for the degradation of oxalic acid (OA) under visible light. The highest photocatalytic activity was achieved with AgCl decoration ratio of 1.0 (denoted as AgCl-CN 1.0 ). The pseudo-first-order constant for OA degradation was 0.0722 min −1 with the mineralization efficiency of 90.80% after 60 min reaction in the photocatalytic process with AgCl-CN 1.0 . A variety of characterization techniques including Brunauer–Emmett–Teller, X-ray diffraction, scanning electron microscope , transmission electron microscopy , X-ray photoelectron spectroscopy, Fourier transform infrared spectra , ultraviolet–visible diffuse reflectance spectra, photoluminescence , and Mott–Schottky were utilized to elucidate the physicochemical, microstructure, and optical properties contributing to the improvement of the photocatalytic performance. The results showed that AgCl-CN 1.0 had an oblate flaky erythrocyte-like structure with a moderate band gap energy of ~ 3.00 eV. In addition, the effects of the key parameters (i.e., AgCl-CN 1.0 dosage, initial OA concentration, solution pH, and presence of natural organic matter) on OA degradation were systematically investigated. Radical scavenger experiments indicated that photogenerated holes, electrons, superoxide anion radicals, and hydroxyl radicals were the dominant reactive species. Moreover, AgCl-CN 1.0 exhibited excellent stability and reusability for OA degradation without detectable Ag + release in the solution over multiple reaction cycles. The efficient OA mineralization could be mainly ascribed to the moderate specific surface area, increased numbers of active sites, and effective interfacial charge transfer of AgCl-CN 1.0 . Overall, the AgCl-CN 1.0 composite was demonstrated to be a highly efficient, stable, and recoverable photocatalyst.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 2
·340-350
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IF 3.552
Zhang Wei,Xu Boren,Gong Caihong,Yi Chunwang,Zhang Shen
In this study, a facile and environmentally friendly method with low energy consumption for preparing nanoscale AgCl and BaSO 4 co-precipitates (AgCl@BaSO 4 co-precipitates) was developed based on the metathetical reaction. Then, the dried co-precipitates were melt-compounded with polyamide 6 (PA6) resins at a specified mass ratio in a twin-screw extruder. The results demonstrated that in the absence of any coating agent or carrier, the nanoparticles of AgCl@BaSO 4 co-precipitates were homogeneously dispersed in the PA6 matrix. Further analysis showed that after the addition of AgCl@BaSO 4 co-precipitates, the antibacterial performance, along with the flame-retardance and anti-dripping characteristics of PA6, was enhanced significantly. In addition, the PA6 composites possessed high spinnability in producing preoriented yarn.
研究领域:
材料科学
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纳米技术
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高分子化学
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DOI
高影响因子
OPTICAL MATERIALS
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2024
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IF 3.8
Tao Xian,Xuelian Ma,Xiaofeng Sun,Chenyang Sun,Huaqing Wang,Lijing Di,Ke Ma,Hua Yang
In this work, a promising p-n type AgCl/BiFeO 3 heterojunction piezo-photocatalysts was constructed by attaching AgCl nanocubes on the surface of BiFeO 3 microdiscs. The characteristic results verified that the intimate heterojunction between AgCl and BiFeO 3 was formed. Under the simulated sunlight excitation, the photocatalytic degradation activity of dye (Acid Orange 7 (AO7) and Rhodamine B (RhB)) over BiFeO 3 can be obviously improved after the decoration of AgCl, and the 10%AgCl/BiFeO 3 sample exhibits optimum photocatalytic removal performance, which leads to ∼99.7% and ∼93.8% of AO7 and RhB degraded after 120 min irradiation. Most importantly, the piezo-photocatalytic degradation ability of 10%AgCl/BiFeO 3 sample was evaluated by the removal of tetracycline (TC) excited by simulated sunlight and ultrasonic irradiation. It is found that the 10%AgCl/BiFeO 3 sample presents more efficient piezo-photocatalytic activity compared with its piezocatalytic and photocatalytic performance, leading to a synergistic factor SF = ∼1.6, which demonstrates an outstanding synergistic improvement between photocatalysis and piezocatalysis. Furthermore, the piezo-photocatalytic degradation pathway of TC was proposed by the intermediates detection and theoretical calculation. The piezopotential of BiFeO 3 microdiscs excited by ultrasonic was simulated. The interface electric field induced by p-n heterojunction and piezoelectric polarization field caused by the ultrasonic irradiation separately promote the surface and bulk migration of generated charges, which synergistically accelerates the separation of generated charges and thus providing more charges for the catalytic reaction. This work has developed a potential efficient heterojunction-type piezo-photocatalysts for environmental purification.
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
Surfaces and Interfaces
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2025
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IF 6.3
Bolong Liang,Xiaoyu Huang,Xi Zhu,Hongbin He,Shu-xuan Liang
Ciprofloxacin accumulates in aqueous environment due to its non-degradability. Photocatalysis, as an economical and efficient treatment technology for organic matter, is mostly used to remove antibiotics from water environment. However, the photocatalytic performance is limited by photocatalysts, which suffer from wide band gap and severe recombination of photogenerated electrons and holes. Therefore, we developed a Z-scheme heterojunction photocatalyst Fe-ZIF-8@AgCl, which was synthesized by combining pre-prepared Fe-ZIF-8 with AgCl. Meanwhile, the X-ray diffractometer, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller analysis and X-ray photoelectron spectroscopy were employed to characterize the structure of Fe-ZIF-8@AgCl, and a series of photoelectric tests were conducted to demonstrate the photocatalytic properties of Fe-ZIF-8@AgCl. The results revealed that Fe-ZIF-8@AgCl had a remarkable 71.9 % removal efficiency of ciprofloxacin by photodegradation in 120 min. Fe-ZIF-8@AgCl could help reduce band gap energy, inhibit the recombination of photoelectrons and holes, lower the charge transfer resistance, and enhance the photocurrent response. Furthermore, Fe-ZIF-8@AgCl still maintained a high photocatalytic performance after 4 cycles, and ·O 2 - was detected and identified as the main photocatalytic active factor. Subsequently, the charge transfer mechanism of direct Z-scheme heterojunction was proposed, and the photocatalytic degradation pathways of ciprofloxacin were analyzed. In this study, Z-scheme heterojunction photocatalyst was prepared and showed great potential for efficient photodegradation of ciprofloxacin.
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
Nanoscale
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2015
·Vol. 7
·期 48
·20414-20425
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IF 7.394
Shuhua Han,Guangju Zhou,Yunzhi Fu,Ying Ma,Li Xu,Chao Zou,Wei Chen,Yun Yang,Shaoming Huang
We report the synthesis of high quality trimetallic Au/Ag/Pt nanorings (TAAPNs) by using Au/Ag alloy decahedra (AAAD) as templates. The alloying effect and AgCl-directing growth have been investigated in detail during the formation of TAAPN. It was found that the doping of Ag in AAAD changes the surrounding environment of Au atoms and decreases the oxidization reduction potential (ORP) of [AuCl2]−/Au because of the alloying effect, resulting in the dissolved O2 molecules that serve as an effective etchant for oxidizing Au to Au(I). Ascorbic acid (AA) and chloroplatinic acid (H2PtCl6) are weak acids which can accelerate the etching by increasing the concentration of H+. The AgCl selectively absorbs on {100} of the decahedra and induces the preferential deposition of H2PtCl6 here via their complexing interaction. AA reduces Pt(IV) and Ag(I) to atoms which grow on {100} facets. The formed Pt/Ag layer changes the etching direction from along [100] to [111] and generates the TAAPN. Besides, it has been noted that the TAAPNs exhibit good Surface Enhanced Raman Scattering (SERS) performance.
研究领域:
材料科学
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纳米技术
·
化学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Chaoying Zhang,Yunguang Yu,Hong Wei,Kebin Li
AgCl was incorporated with clay montmorillonite to improve the individual catalytic or adsorption performance. A green method was proposed to synthesize AgCl/montmorillonite composite by intercalating silver-ammonia complexes into the interlayers of montmorillonite followed by reacting with HCl vapor to in situ form AgCl particles on montmorillonite. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, transmission electron microscope, Brunauer–Emmett–Teller analysis, X-ray photoelectron spectra, and UV–vis diffuse reflectance spectrum. It was shown that AgCl not only intercalated into the interlamination of montmorillonite but also anchored on its exterior surfaces. AgCl on clay surface was cube-like particles, which were dominated by the higher activity of {1 0 0} planes. The photocatalytic activity of AgCl/montmorillonite (AgCl-Mt) composites were evaluated by degradation of azo dye Acid Red 18 (AR18) under UV-irradiation. AgCl in AgCl-Mt composites had an optimum amount. When 3CEC of silver-ammonia was used to prepare [Ag(NH 3 ) 2 ] + -exchanged Mt, the obtained 3AgCl-Mt had the best activity. The degradation of 50 mL AR18 at pH 6 with 1 g L −1 of catalyst only needed 10 min. The low pH and dye concentration, and high catalyst loading favored the removal of dye. Moreover, the superoxide radicals and holes were found to be major reactive species responsible for the photocatalytic degradation of AR18. PL revealed that besides reducing the aggregation of AgCl and tailoring morphology of AgCl, montmorillonite also suppressed the combination of photogenerated electron-hole pairs, and thus enhanced the photocatalytic activity and stability. This study may offer an efficient approach for fabricating silver-halide-based composite photocatalysts for environmental cleanup.
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
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Bin Wang,Chengle Wang,Yanting Tang,Hao Yang,Yajie Tian,Xin Yu,Qian Li
High-performance composite photocatalysts attracts considerable research interests for the photodegradation of emerging pollutants under visible-light irradiation. In this study, hybrid AgCl-coated Ag 2 MoO 4 composites were synthesized using a chemical deposition strategy for the photodegradation of organic pollutants. The successful establishment of Ag 2 MoO 4 @AgCl nanostructures led to a highly decreased recombination of photo-generated electrons and holes, as well as significantly improved charge separation. The synthesized Ag 2 MoO 4 @AgCl composites exhibited markedly enhanced photocatalytic performance for the degradation of organic pollutants compared to pristine Ag 2 MoO 4 and AgCl due to the creation of unique heterostructures with strongly combined interfaces. Notably, the obtained Ag 2 MoO 4 @AgCl-11 composite demonstrated the highest photocatalytic performance for levofloxacin degradation with a first-order kinetic constant of 0.0436 min −1 , which was 31.14 times that of Ag 2 MoO 4 sample and 8.90 times that of AgCl sample. Furthermore, the synthesized Ag 2 MoO 4 @AgCl composites showcased an excellent photocatalytic stability. This work highlights the great potential of Ag-based composite photocatalysts for the efficient photodegradation of emerging pollutants under visible-light irradiation.
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 POROUS MATERIALS
·
2017
·Vol. 25
·期 1
·189-198
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IF 1.624
Feng Zhouzhou,Lv Xiang,Wang Tianhe
TiO 2 porous ceramic/Ag–AgCl composite was prepared by incorporating AgCl nanoparticles within the bulk of TiO 2 porous ceramic followed by reducing Ag + in the AgCl particles to Ag 0 species under visible light irradiation. The porous TiO 2 ceramic was physically robust and chemically durable, and the porous structure facilitated the implantation of AgCl NPs. Compared with the bare TiO 2 ceramic, TiO 2 porous ceramic/Ag–AgCl composite exhibited higher photocatalytic performance for the degradation of MO and RhB under visible light irradiation. The reaction rate constants k of MO and RhB degradation over TiO 2 porous ceramic/Ag–AgCl composite was respectively 6.25 times and 3.62 times higher than those recorded over the bare TiO 2 porous ceramic. The photocatalytic activity showed virtually no decline after four times cyclic experiments under visible light irradiation. Scanning electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectra and X-ray photoelectron spectroscopy were used to characterize the TiO 2 porous ceramic/Ag–AgCl composite.
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
高影响因子
危险品化学品经营许可证（带存储）