JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Mei Liu,Lingcheng Zheng,Jiale Deng,Juan Gao,Kangrui Su,Xile Sheng,Jie He,Deqiang Feng,Lei Guo,Changzhao Chen,Yang Li
Constructing highly efficient, stable and wide applicable photocatalysts with simple and controllable components to confront the environmental issue need sustained efforts. In this work, Ag nanoparticles decorated AgBr/BiVO 4 shell/core heterojunction (Ag@AgBr/BiVO 4 ) was synthesized, which showed high photocatalytic activity in removing rhodamine B (RhB, 99.1 % in 20 min) and tetracycline (TC, 94.1 % in 20 min) under visible-light irradiation. The band structure was determined based on the light absorption spectra and Mott-Schottky test. The free radical scavenger test showed the production of ·OH and ·O 2 − radicals which accelerated the photodegradation. Basing on these results, the enhanced photocatalytic performance can be attributed to AgBr/BiVO 4 shell/core heterojunction that spatially separates the photogenerated carriers and inhibits bulk recombination. The localized surface plasmon resonance (LSPR) effect of Ag particles also improved the light absorption ability of the photocatalyst and effectively produce excess active species to accelerate the photodegradation of contaminants. The results show a coordinated regulation of Ag nanoparticles and AgBr/BiVO 4 shell/core heterojunction to achieve high photocatalytic properties, the strategy of rational designing structure and energy band alignment may also offer a new insight for the applications in solar energy conversion field.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 19
·13474-13486
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IF 3.3
Xin Guan,Xiao-li Wang,Xue-wen Zhu,Hui Yu,Ming Yang,Xiang-ting Dong,Ying Yang,Long Xia
β-Bi2O3 demonstrates excellent photocatalytic activity under visible light, but it has a very high photogenerated e−–h+ recombination rate and quite low quantum efficiency. AgBr also shows excellent catalytic activity but Ag+ is easily reduced to Ag under light radiation, which limits its application in the photocatalysis field, and there are few reports about the application of AgBr in photocatalysis. In this study, the spherical flower-like porous β-Bi2O3 matrix was first obtained, and then the spherical-like AgBr was embedded between the petals of the flower-like structure to avoid direct light radiation. The only light through the pores on the β-Bi2O3 petals could be transmitted onto the surfaces of AgBr particles to form a nanometer point light source, which photo-reduced Ag+ on the surface of the AgBr nanospheres to construct the Ag-modified AgBr/β-Bi2O3 embedded composite and a typical Z-scheme heterojunction was constructed. Under this bifunctional photocatalyst and visible light, the RhB degradation rate reached 99.85% in 30 min, and the photolysis water hydrogen production rate reached 6.288 mmol g−1 h−1. This work is as an effective method for not only the preparation of the embedded structure, quantum dot modification and flower-like morphology but also for the construction of Z-scheme heterostructures.
研究领域:
材料科学
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光催化
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环境化学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jiangli Sun,Jinhang Yang,Jiaxiang Liang,Lingli Tu,Yuejing Bin,Yanping Hou
It is crucial to design efficient photocatalysts for elimination of combined pollutants in wastewater. Herein, the S-scheme Zn 3 In 2 S 6 -BGQDs/AgBr (ZBA) heterojunction was synthesized through co-modification of Zn 3 In 2 S 6 with B-doped graphene quantum dots (BGQDs) and AgBr nanoparticles using solvothermal method for synchronous removals of nitrofurazone (NFZ) and Cr (VI). Characterization results revealed that ZBA showed superior photocatalytic activity than the counterparts. In NFZ-Cr (VI) coexistence environment, removal efficiencies towards NFZ and Cr (VI) were 95.23% and 99.39% using the ZBA photocatalyst within 2 h of visible light irradiation. Results demonstrated that ∙OH, h + and ∙O 2 − played major role for NFZ removal, while mainly e - and ∙O 2 − contributed to Cr (VI) reduction. The S-scheme heterojunction mechanism of ZBA was confirmed by energy band structure analysis, ESR and calculated work function. Possible pathways and mechanisms of NFZ degradation were proposed according the identified intermediates. Besides, the ecotoxicity of intermediates was analyzed. This study advances the development of photocatalytic treatment of combined-polluted wastewater.
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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光催化
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产品关联
DOI
高影响因子
Data in Brief
·
2018
·
IF 0
Dandan Song,Di Li,Xuan Xiao,Cheng Chen,Somboon Chaemchuen,Ye Yuan,Francis Verpoort
Data presented here are related with the research article entitled “Synthesis of ß -oxopropylcarbamates in a recyclable AgBr/ionic liquid catalytic system: An efficient assembly of CO 2 under ambient pressure” (Song et al., 2018) [1] . In this data article, the general synthetic procedures of ß-oxopropylcarbamates through the three-component reaction of propargylic alcohols, secondary amines and carbon dioxide (CO 2 ) catalyzed by a recyclable AgBr/ionic liquid (IL) system under mild pressure are described. Furthermore, the process for recycling the catalysts is supplied as well. Specifically, the investigative data for the temperature, amount of ILs, reaction time as well as the state of silver in the system are also reported. Finally, all the target products are confirmed by 1 H NMR, 13 C NMR, and high-resolution mass spectroscopy (HR-MS).
研究领域:
有机化学
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绿色化学
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DOI
PubMed
Journal of CO2 Utilization
·
2018
·
IF 5.503
Dandan Song,Di Li,Xuan Xiao,Chen Cheng,Somboon Chaemchuen,Ye Yuan,Francis Verpoort
A green and recyclable catalytic system based on AgBr and an ionic liquid (IL) was developed for the three-component coupling reaction of propargylic alcohols, secondary amines and carbon dioxide (CO 2 ). A series of target carbamates, especially those generated from challenging substrates, could be obtained smoothly at atmospheric CO 2 pressure in a straightforward one-pot process. Moreover, the catalyst loading reached the lowermost level ever reported. Particularly, this catalytic system exhibited robust constancy and could be reused at least 5 times with retention of high catalytic activity. It is worth noting that this is the first catalytic system which could be recycled successfully for this reaction.
研究领域:
化学
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催化
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绿色化学
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有机合成
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产品关联
DOI
高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 9
·2654-2668
·
IF 7.683
Wei Li,Xiao-shan Chu,Shu-ao He,Xue-chuan Wang,Chuan-yi Wang
Tetracycline hydrochloride (TTC), a typical antibiotic with biological toxicity, is very harmful to the ecosystem. Photocatalysis is considered an effective method for solving this problem. However, traditional photocatalysts have limited light response, poor charge transport, and low adsorption ability, which substantially limit their application. Herein, gourd-like hollow mesoporous silica (HS) particles with considerable BET surface area (1181.57 m2 g−1) and enhanced light absorption were constructed to support the Ag/AgBr Schottky junction. Photoelectrochemical characterizations confirmed that the optical response and charge transfer of the fabricated photocatalysts were significantly elevated because the synergistic effect of the Ag/AgBr Schottky junction and amino-modified gourd-like HS particles facilitated the effective generation of ˙OH radicals. The optimal HS-Ag/AgBr (40 wt% HSAA) exhibited highest TTC degradation activity (3.79 × 10−2 min−1) owing to a redox reaction with O2˙−/˙OH radicals, which was about 28.3-fold greater than the commercial P25 (1.34 × 10−3 min−1) and 12.8-fold greater than the AgBr (2.96 × 10−3 min−1). Most importantly, about 72.04%/81.17% of TTC was mineralized by optimal 40 wt% HSAA after 90 min/150 min of illumination, which was higher than those with P25 and other Ag/AgBr-based photocatalysts reported in the literature. Therefore, TTC and its by-products could be completely decomposed by this novel structure, and this study provides a prospective approach for the effective handling of antibiotic pollution in the ecosystem.
研究领域:
环境科学
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材料科学
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化学
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光催化技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
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2017
·Vol. 28
·期 7
·1-11
·
IF 2.325
Cao Weiwei,Zhang Yu,Wang Xi,Chen Yinyan,Li Qiang,Xing Xiaodong,Xiao Yuhong,Peng Xuefeng,Ye Zhiwen
Abstract Research on the incorporation of cutting-edge nano-antibacterial agent for designing dental materials with potent and long-lasting antibacterial property is demanding and provoking work. In this study, a novel resin-based dental material containing photocurable core-shell AgBr/cationic polymer nanocomposite (AgBr/BHPVP) was designed and developed. The shell of polymerizable cationic polymer not only provided non-releasing antibacterial capability for dental resins, but also had the potential to polymerize with other methacrylate monomers and prevented nanoparticles from aggregating in the resin matrix. As a result, incorporation of AgBr/BHPVP nanocomposites did not adversely affect the flexural strength and modulus but greatly increased the Vicker’s hardness of resin disks. By continuing to release Ag + ions without the impact of anaerobic environment, resins containing AgBr/BHPVP nanoparticles are particularly suitable to combat anaerobic cariogenic bacteria. By reason of the combined bactericidal effect of the contact-killing cationic polymers and the releasing-killing Ag + ions, AgBr/BHPVP-containing resin disks had potent bactericidal activity against S. mutans . The long-lasting antibacterial activity was also achieved through the sustained release of Ag + ions due to the core-shell structure of the nanocomposites. The results of macrophage cytotoxicity showed that the cell viability of dental resins loading less than 1.0 wt% AgBr/BHPVP was close to that of neat resins. The AgBr/BHPVP-containing dental resin with dual bactericidal capability and long term antimicrobial effect is a promising material aimed at preventing second caries and prolonging the longevity of resin composite restorations. Graphical Abstract
研究领域:
牙科材料
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纳米技术
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 90
·74126-74131
·
IF 3.84
Jun Zhu,Xiufang Xu,Jinglei Liu,Yiqun Zheng,Shifeng Hou
We report a facile method for the synthesis of oleylamine-capped silver (Ag) nanowires in high purity. For the first time, Ag nanowires could be produced in high purity via a simple one-pot approach in a hydrophobic phase. The success of this synthesis relies on the use of Cu2+ to mediate the reduction of silver bromide (AgBr) by oleylamine at an elevated temperature, which promoted the high-yield formation of Ag products with a wire-like shape. These Ag nanowires were washed and deposited on PET films to form a transparent conductive electrode (TCE), which showed a sheet resistance of 34.0 Ω sq−1 and an optical transmittance of 70–80% at visible wavelengths. In addition to TCEs, these nanowires could also find important applications in the fields of conductive ink, and wearable electronics, among others.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Shah Fahad,Haojie Yu,Li Wang,Jinhua Liu,Songbiao Li,Junchao Fu,Bilal Ul Amin,Rizwan Ullah Khan,Sahid Mehmood,Fazal Haq,Wang Nan,Muhammad Usman
Silver nanowires (AgNWs) have attracted growing interest because of their wide range of applications in modern nano electronic appliances. During polyol method, the presence of cations and anions in the reaction solution has influence on the final morphology of AgNWs. Here we report a feasible way to prepare AgNWs by polyol method. Copper bromide (CuBr 2 ) salt was used to provide anions and cations in the reaction solution. The anions (Br − ) helps in reducing the amount of free Ag + by forming silver bromide (AgBr) during initial silver seeds formation and the cations scavenge oxygen from the surface of AgNWs during preferential growth of the AgNWs. Ethylene glycol (EG) was used as a solvent and reducing agent, silver nitrate (AgNO 3 ) was used as Ag source and polyvinyl pyrrolidone (PVP) was used as a capping agent. The effects of various factors which influence the final morphology of AgNWs were studied. AgNWs were successfully synthesized in the presence of CuBr 2 salt. The morphology of the synthesized AgNWs was characterized by the SEM and TEM. The crystallinity was characterized by HRTEM, SAED and XRD . The LSPR peaks of Ag nanostructures were revealed by UV–Vis spectroscopy. The conductive properties of AgNWs thin conductive films were studied by coating the synthesized nanowires on polyethylene terephthalate (PET) substrate.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 43
·2306042
·
IF 19
Haoran Huang,Heyang Chen,Zhiqiang Gao,Yupeng Ma,Kunpeng Zhao,Tian-Ran Wei,Xun Shi
In general, inorganic non-metallic materials exhibit brittleness, and achieving plasticity in wide-gap semiconductors or dielectrics poses an even greater challenge. Historically, silver halides have been suggested to be ductile; however, their deformability under different load modes has not been well demonstrated, and the underlying mechanisms are not fully understood. In this study, the authors demonstrate the excellent plasticity of AgCl and AgBr polycrystals at room temperature under tension, bending, compression, and roller pressing. In particular, the rolling reduction rate of AgCl/AgBr exceeds 97%, corresponding to the plastic extensibility from 3600% to 4200%. The metal-like plasticity and multiple slip systems are attributed to the ionic features, specifically the Coulombic nature of the Ag-Cl/Br interactions, and the appreciable polarization of the anions. Such less localized diffuse bonding can be readily switched upon atomic gliding, thus ensuring slip without cleavage. This study contributes to the advancement of the understanding and development of wide-gap plastically deformable inorganic materials for applications in flexible, shape-conformable high-power electronics and dielectrics.
研究领域:
材料科学
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固体力学
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DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 56
·48427-48439
·
IF 4.6
Shuai Fu,Yun Wen,Qiang Huang,Yonglong Song,Qi Liu,Huijie Zhu,Yanhong Wang,Tingting Feng,Shichao Liu,Zhiqun Ma
The Z-scheme AgBr/BiFeO3 heterojunction was successfully constructed via a combined hydrothermal and in situ precipitation strategy. The optimized heterojunction exhibited remarkable photocatalytic activity, achieving 95.72% degradation of Lanasol Red 5B within 60 min under visible-light irradiation, which represented a 5.66-fold enhancement over pristine BiFeO3. Comprehensive characterization revealed that the Z-scheme heterostructure effectively facilitated charge carrier separation and modified electron transfer pathways. The experimental factor towards degradation efficiency of Lanasol Red was investigated. Furthermore, the AgBr/BiFeO3 heterojunction demonstrated versatile degradation capability toward various organic dyes including Lanasol Red 5B, rhodamine B, methyl orange, methyl red, and methylene blue. Trapping experiments combined with ESR analysis verified that holes (h+) and superoxide radicals (˙O2−) played critical roles in the photocatalytic process, which formed the basis for postulating a Z-scheme charge transfer mechanism. This work provided a feasible synthesis strategy for developing high-performance BiFeO3-based photocatalytic systems for environmental remediation applications.
研究领域:
材料科学
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环境修复
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光催化
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纳米材料
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异质结工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2023
·Vol. 38
·期 5
·1198-1204
·
IF 1.6
Yin Xiaogang,Liu Xinyun,Li Hang,Wu Huimin,Fu Hai,Gong Wei
We investigated the removal of the organic dye rhodamine B in wastewater with recyclable AgBr/polypyrrole (PPy) nano-photocatalysts. With PPy as an active base for electron transfer, and hexadecyltrimethylammonium bromide (CTAB) as both the soft-templating agent and the bromine source, a series of AgBr/PPy nano-photocatalysts containing various proportions of silver were prepared in a convenient one-step synthesis procedure. The synthesized catalysts were characterized by TG analysis to reveal that, in comparison with pure PPy, the interaction between PPy and AgBr led to increased thermal stability. Chemical combination of PPy and AgBr was observed through XRD and XPS analyses. For the morphology study, the AgBr particles were found to be well dispersed in the PPy nanowire network from SEM results. In the photodegradation experiments, up to 92% rhodamine B was degraded by the AgBr/PPy catalysts in the period of 1 hour under 254 nm UV light. The catalysts could maintain 60% catalytic efficiency after 3 cycles in the recyclability test.
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高影响因子
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