COMPOSITES PART B-ENGINEERING
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2021
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IF 9.078
Saipeng Zhou,Mingming Hou,Yulong Sun,Wenzhe Zhao,Honglin Wang,Quanhui Guo,Xin Yu,Xinqi Ma,Junwei Zhao
Preparation of high-performance semiconductor photocatalysts is often considered to be the challenge and focus in dealing with water contaminations, and attracts numerous concerns and research interests nowadays. In this work, high-performance Z-scheme AgI/(Na,F) doped g-C 3 N 4 composites were synthesized by facile calcination and in-situ deposition methods and employed for ultrahigh-performance degradation of broad-spectrum antibiotics contaminants. The prepared (Na,F) doped g-C 3 N 4 showed narrower bandgaps, enhanced solar-light absorption, and highly improved visible-light photocatalytic performance. Besides, the strong combined interfaces between AgI nanoparticles and (Na,F) doped g-C 3 N 4 was contributing to visible-light harvesting and highly boosted charge separation of the samples, among which AgI/(Na,F)–CN-40% composite presented the best visible-light photocatalytic performance. The photocatalytic reaction rate constant of the AgI/(Na,F)–CN-40% composite was as high as approximately 0.2007 min −1 , which was 65.80 times of pristine g-C 3 N 4 and 3.60 times of AgI, mainly because of the construction of direct Z-scheme charge transfer pathways between AgI and (Na,F) doped g-C 3 N 4 . Finally, the radical scavenger experiments, possible degradation pathways , and photocatalytic mechanism were also proposed.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Zhouyue Wu,Jinpeng Yu,Wenfang Wang,Changhui Xin,Xin Yu,Yanting Tang
Antibiotics contaminants gradually evolve into one of widely concerned public safety events and attract numerous investigations. In this work, hybrid AgI@Ag 3 PO 4 nanostructures were designed and synthesized for visible-light photodegradation of norfloxacin via facile self-assembly formation strategy method. The well mixed anions here induced good interface contacts and the formation of AgI@Ag 3 PO 4 nanostructures. The experimental results indicated that nanostructured AgI@Ag 3 PO 4 composites showed highly enhanced visible-light photocatalytic performance, and the AgI@Ag 3 PO 4 -15 sample presented the best visible-light photocatalytic performance, which was far better than that of pristine AgI and 2.96 times of pristine Ag 3 PO 4 . These findings were mainly attributed to construction of heterostructure structures between AgI and Ag 3 PO 4 as well as the surface plasmon resonance effects of the generated Ag nanoparticles. Besides, the main active species, possible visible-light photodegradation pathways, and visible-light photocatalytic mechanism were also proposed in detail. Current work indicates an efficient and promising visible-light composite photocatalyst for emerging pollutants degradation.
研究领域:
环境科学
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材料科学
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光催化技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yi Duan,Lin Deng,Zhou Shi,Lei Zhu,Guangchao Li
A highly efficient visible-light-driven photocatalyst Ag 3 PO 4 /AgI-Graphene (Ag 3 PO 4 /AgI-G) was synthesized through a chemical coprecipitation procedure. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were performed to study the physicochemical structural of the photocatalysts. The photocatalytic activity of the samples was examined by the carbamazepine (CBZ) degradation under artificial visible light and natural sunlight irradiation. Experimental results indicated that the introduction of low mass content of graphene enhanced the photocatalytic performance of Ag 3 PO 4 /AgI, and the photocatalytic degradation efficiency of CBZ over Ag 3 PO 4 /AgI-3%G (mass ratio of graphene:Ag 3 PO 4 /AgI = 3:100) reached 93.06% within 21 min, which was much higher than that over pure Ag 3 PO 4 (26.92%) and Ag 3 PO 4 /AgI (74.38%). UV–vis diffuse reflectance spectra, photoluminescence (PL) spectra, transient photocurrent responses and electrochemical impedance spectra (EIS) of the samples were conducted to verify the high photocatalytic performance of the Ag 3 PO 4 /AgI-3%G. In addition, possible photocatalytic degradation pathways of CBZ were proposed based on the analysis of transformation products during the reaction. The reactive species trapping experiments and Electron spin resonance (ESR) analysis demonstrated that h + and O 2 − were the main active oxidant species responsible for CBZ photodegradation. The photocatalytic degradation mechanism of CBZ over Ag 3 PO 4 /AgI-3%G under visible light irradiation was schematically proposed. This study not only provides a new technique for the synthesis of Ag 3 PO 4 -based photocatalysts with high photocatalytic activity, but also demonstrates that the Ag 3 PO 4 /AgI-3%G composite could be a promising photocatalyst for the treatment of waters containing CBZ.
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
OPTICAL MATERIALS
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2022
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IF 3.754
Weili Huang,Junhui Yi,Xiaoying Liao,Changquan Jiao,Runkun Xie,Beifang Chen,Zebo Lin,Yupeng Yang,Weitao Liu,Huimei Mo
AgVO 3 and AgI have attracted great interest in environmental remediation. Aiming at enhancing the catalytic activity and stability of AgVO 3 . Visible light response Z-scheme AgI/Ag/AgVO 3 hybrid nanorods were prepared by in situ reduction and ion exchange grown. The results of characterization and experiment showed that obtained hybrid material are primarily composed of AgVO 3 nanorods, whose surface were closely attached to AgI and Ag particles. Compared with AgVO 3 and Ag/AgVO 3 , the absorbance of Z-scheme AgI/Ag/AgVO 3 hybrid nanorods in the visible light region is dramatically enhanced. The degradation efficiency of sample is five times of that of AgVO 3 and four times of that of Ag/AgVO 3 , respectively. And the degradation efficiency still keep 90% after the fourth repeat experiment. The trapping experiments of active species confirmed that the contribution of the degradation for AO-II is mainly attributed to h + and ∙O 2 − . The efficient photocatalytic activity can be explained by Z-type mechanism, which promote effective separation of photogenerated charges. This study provides an idea for the design of efficient visible light photocatalysts .
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yangjie Fu,Yanjie Mao,Longyang Wang,Mengyi Qiu,Youran Xu,Jianying Qian,Men Tan,Kejie Zhang,Derek Hao,Qi Wang,Guoxiang Yang
Proper design and successful synthesis of photocatalysts with efficient interfacial charge transfer, strong redox capabilities, and strong environmental applications are critical. Herein, a novel Z-scheme heterojunction AgI/Ce-2MI nanocomposite with redox-retaining properties was successfully prepared by a simple precipitation method. Compared with AgI and Ce-2MI, the efficiency of the optimized Z-scheme AgI/Ce-2MI composites in photocatalytic reduction of Cr(VI) in water within 75 min could exceed 90%. The reduction rate of AgI/Ce-2MI to Cr(VI) was 0.0277 min −1 , which was 2.6 times and 6.8 times that of AgI and Ce-2MI, respectively. In addition, the cycle performance of AgI/Ce-2MI under different pH conditions was compared, and it was found that under the condition of pH= 2, its five-time catalytic activity stability showed good performance. Moreover, the enhancement process of reactive oxygen species •O 2 - and •OH were further verified by active radical capture experiment and ESR. Therefore, this study can provide a Z-scheme heterojunction nanocomposite photocatalytic process with environmental purification functions.
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
DYES AND PIGMENTS
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2020
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IF 4.613
Ding Yuan,Liying Huang,Yeping Li,Hao Wang,Xiuquan Xu,Chaobao Wang,Lei Yang
Making multiple heterojunction of photocatalysts is an effect approach to achieve high effective utilization of solar resource. A novel ternary AgI/BiOI/pg-C 3 N 4 nanocomposite was synthesized with a unique n-p-n heterojunction. In this work, an in-situ transformation method was used to fabricate AgI/BiOI/pg-C 3 N 4 heterostructure with different AgI/BiOI ratios. The photocatalytic activity of the AgI/BiOI/pg-C 3 N 4 was detected by the degradation of methylene orange (MO) and tetracycline (TC). The AgI/BiOI/pg-C 3 N 4 composites exhibited better photocatalytic activity than pg-C 3 N 4 and BiOI/pg-C 3 N 4 composite. The performance of photocatalytic antibacterial inactivation of E. coli indicated that the AgI/BiOI/pg-C 3 N 4 heterostructure is an ideal material for antibacterial applications. The ESR and trapping experiments confirmed that the degradation of organic pollution is completed through the co-operation of •O 2 − , •OH and h + . A possible mechanism of the degradation process is 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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Lihua Zhi,Shengya Zhang,Youyuan Xu,Jibing Tu,Min Li,Dongcheng Hu,Jiacheng Liu
Controllable fabrication of nanomaterials with hierarchical architecture have received much attention in the field of photocatalysis due to their enhanced light-harvesting efficiency. Moreover, fabricating direct Z-scheme heterojunctions have been proven to be effective way to enhance the photocatalytic performance of photocatalysts . Herein, hierarchically hollow WO 3 nanoflower was successfully synthesized by a simple hydrothermal treatment of tungsten chloride (WCl 6 ) in ethanol solution. Decoration of the obtained WO 3 with AgI nanoparticles in situ can form the Z-scheme AgI/WO 3 hollow hierarchical nanoflowers (AgI/WO 3 HHNFs). The AgI/WO 3 HHNFs exhibited excellent photocatalytic activity and remarkable stability for the degradation of tetracycline hydrochloride (TC-HCl) and Eosin B (EB) under the irradiation of a low energy consume light (LED lamp, 5 W). Interestingly, compared to pure AgI nanoparticles , 3D hollow WO 3 nanoflowers and AgI/WO 3 nanosheets , the AgI/WO 3 HHNFs revealed conspicuously enhanced photocatalytic activity . This phenomenon could be associated to three aspects, namely the high light-harvesting efficiency, increased light trapping and scattering capability and strongly coupled Z-scheme heterointerface, which effectively improved the photoelectron-hole sepreation efficiency. Our work therefore provide a novel insight for the fabrication of 3D hollow hierarchical structures.
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
CHEMICAL ENGINEERING SCIENCE
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2023
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IF 4.7
Junchang Liu,Minghui Zhu,Weijie Yuan,Guoying Yang,Chen Zhang,Huayang Zhang,Dafeng Zhang,Peiqing Cai,Xipeng Pu
A unique lamellar WO 3 /AgI S-scheme heterojunction is constructed via integrated hydrothermal and coprecipitation methods. Optimized WO 3 /AgI composite shows significantly enhanced photocatalytic ciprofloxacin (CIP) degradation under visible light irradiation, achieving a removal rate of 53.4 % within 3 h, which is about 7.63 and 1.56 times superior than those of pristine WO 3 and AgI, respectively. The characterizations, experiment results and Density Functional Theoretical (DFT) calculation results confirm the enhanced light absorption, well-aligned straddling band structures and reasonable formation of S-scheme heterojunction with efficient photogenerated carriers transfer between WO 3 and AgI. Moreover, O 2 − and h + are identified as the main active species, with O 2 − plays a dominant role in WO 3 /AgI during the photocatalytic degradation of CIP. This work elucidates a possible approach to develop photocatalysts with a high antibiotic removal efficiency through a higher reducing ability and stronger oxidizing ability of S-scheme heterojunction by reasonable structure configuration.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Jiayi Chen,Xinyan Xiao,Yi Wang,Mingli Lu,Xingye Zeng
A novel AgI/BiOBr/reduced graphene oxide (RGO) composite was prepared through a facile solvothermal method followed by an in-situ precipitation process. The as-prepared AgI/BiOBr/RGO ternary composite exhibited significantly enhanced photocatalytic activity towards the degradation of tetracycline (TC) under simulated sunlight irradiation. The degradation rate of AgI/BiOBr/RGO was approximately 5.9 and 2.9 times higher than that of pristine BiOBr and AgI, respectively. The improved photocatalytic activity of AgI/BiOBr/RGO composite could be ascribed to the synergistic effect of AgI, BiOBr and RGO. The RGO/BiOBr nanosheets could provide aboundant reactive active sites and serve as appropriate substrates for in-situ growth of AgI NPs. Furthermore, RGO with superior electronic conductivity accelerated the separation of photogenerated electron-hole pairs in AgI/BiOBr/RGO composite, as well as extended visible-light absorption capability. The possible degradation pathway of TC was proposed through the identification of intermediate products using LC-MS analysis. Additionally, combined with the results of active species trapping experiments and ESR measurements, a possible mechanism of RGO-promoted Z-scheme charge transfer for AgI/BiOBr/RGO 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
TALANTA
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2017
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IF 4.162
Bing Zhang,Xue Wang,Yanling Zhao,Jia Lv,Hongyun Meng,Honghong Chang,Hui Zhang,Wenlong Wei
Visual detection of tumor markers with accuracy and selectivity exhibits significant advantages for cancer early diagnosis due to its low-cost and simple analytical instruments. Herein, a highly photosensitive colorimetric immunoassay for carcino embryonie antigen (CEA, as a model) detection based on Cu 2+ doped Ag-AgI nanocomposite was constructed. First, Cu 2+ doped Ag-AgI nanocomposite (Cu 2+ /Ag-AgI) owned the ability of oxidization of TMB was synthesized by impregnation method, which was characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS). Second, based on sandwich-type immunoassay, the immunocomplex was built on the surface of magnetic bead by utilizing Cu 2+ /Ag-AgI as labels. The blue color of TMB ox was obtained under visible irradiation and ultraviolet spectrum scanning was carried out in ABS buffer solution. Under optimal conditions, the absorbance values increased with the increasing of CEA concentrations in sample with the linearity range of 1.0 pg mL −1 −5.0 ng mL −1 . The detection limit was 0.13 pg mL −1 . More importantly, the developed colorimetric immunoassay exhibited good selectivity, repeatability, stability and possible applications in the real serum sample analysis.
研究领域:
生物医学工程
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肿瘤学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Jue Liu,Can Meng,Xinyu Zhang,Senyu Wang,Kuan Duan,Xian Li,Yuanan Hu,Hefa Cheng
A novel In 2 O 3 /AgI heterojunction, which has a hollow tubular structure with AgI particles distributed evenly on the outer and inner surfaces of In 2 O 3 microtubes, was fabricated from annealing of AgI adhered to MIL-68(In). The as-prepared heterojunction exhibited much higher photocatalytic activity towards tetracycline degradation compared to In 2 O 3 and AgI. The presence of InAg-1 (1.0 g/L), which has a In 2 O 3 :AgI mole ratio of 2:1, could achieve 98.4% removal of tetracycline (20 mg/L) from the solution phase under visible light illumination in 10 min, and it had excellent reusability and stability. The In 2 O 3 /AgI heterojunction also exhibited excellent performance in photocatalytic degradation of tetracycline in different types of water matrices and under natural sunlight illumination, demonstrating its potential in practical application. The superior photocatalytic activity of InAg-1 is attributed to the heterojunction formation and generation of oxygen vacancies (OVs), which improve the separation efficiency of photoinduced e − -h + pairs. Meanwhile, the built-in electric field (BIEF) formed with e - flowing from AgI to In 2 O 3 , which is confirmed by density functional theory calculations, helps the formation of a Z-scheme, instead of type II, heterojunction between In 2 O 3 and AgI. Results of radical trapping experiments and electron spin resonance spectra reveal that 1 O 2 , h + , •O 2 − , and •OH were the key reactive species involved in the photocatalytic degradation process. These findings indicate that Z-scheme photocatalysts with OVs could efficiently activate molecular oxygen and thus have excellent photocatalytic activity towards degradation 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
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Zhixin Ren,Lin Yang,Xiaoxue Tang,Qing Xu,Yanan Niu,Yuguang Lv,Mingyuan Liu
AgI/CeO 2 /rGO complexes were prepared in different proportions and characterized by XRD , SEM, TEM , FT-IR, XPS, BET, PL , I-T and EIS. The photocatalytic degradation experiments of levofloxacin (LVF) under visible light (λ max =245 nm) was performed to determined the photocatalytic activity of the composites. When the concentration of simulated pollutants is 20 mg/L and the amount of application is 15 mg, the doping ratio is AgI/CeO 2 /3%-rGO, and the photocatalytic effect of the nanocomposite with pH 5 is the best. The maximum photocatalytic degradation rate of 98.02% can be achieved. The cyclic stability of the composites and the kinetics were also analyzed, and possible degradation mechanisms were also proposed. The intermediates were also detected using high performance liquid chromatography-mass spectrometry(HPLC-MS) to obtain the possible degradation process . The results show that AgI/CeO 2 /rGO composite exhibits good photocatalytic degradation performance under visible light, and the maximum photocatalytic degradation rate for treating pollutants containing LVF is 98.02%. These findings are expected to provide important theoretical and practical guidance for environmental treatment and research and development of photocatalytic materials.
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
危险品化学品经营许可证（带存储）