CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Jiangfu Zheng,Changzheng Fan,Xiaoming Li,Qi Yang,Dongbo Wang,Abing Duan,Jinglin Ding,Shengxiang Rong,Zhuo Chen,Jun Luo,Baowei Zhang
A novel hexagonal AgBr/Zn-Al MMO S-scheme photocatalyst was prepared by adopting a simplified hydrothermal and co-precipitation method. The prepared photocatalytic system exhibited excellent photocatalytic performance in degradation of tetracycline hydrochloride (TC). In particular, the ABMO0.2/Vis system generated the best TC removal rate (95%) within 60 min of visible light irradiation. Moreover, no significant decrease of the photocatalytic performance had been observed after four cycles, while the leaching of silver ions was effectively controlled. The excellent photocatalytic performance can be attributed to the synergistic effect occurring between the unique morphological structure and the S-scheme heterojunction charge transfer mechanism, since that that synergistic effect enhanced light absorption capacity and separation efficiency of the photogenerated carriers and the redox ability. In addition, liquid chromatography-mass spectrometry (LC-MS) analysis clarified the mineralization behavior and detailed decomposition pathways of TC. This work opens a new pathway for the design of efficient S-scheme heterojunctions and provides new insights into the photocatalytic degradation mechanism of antibiotics.
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
·
2018
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IF 4.439
Yaju Zhou,Jinze Li,Chongyang Liu,Pengwei Huo,Huiqin Wang
A multiple transmission channels, heterojunction and 3D PCN/AgBr/rGO photocatalyst was successfully synthetized by introducing the reduced graphene oxide (rGO) covering AgBr onto the surface of 3D porous g-C 3 N 4 (PCN). In PCN/AgBr/rGO, PCN as a semiconductor photocatalyst provides the 3D framework, the heterojunction was formed with AgBr particles and PCN, rGO promotes the electron transfer simultaneously and introduces a multiple transmission channels system to increase the active species. Thanks to the heterojunction formed between PCN and AgBr, resulting rapid separation of photo-generated e − /h + at interface. The 3D PCN/AgBr/rGO nanocomposite exhibits excellent photocatalytic efficiencies for tetracycline (TC) up to 78.4% within 90 min and 2,4-dichlorophenol (2,4-DCP) up to 68.2% within 6 h. The photocatalytic rate of PCN/AgBr/rGO was much higher than 3D PCN (21%), AgBr particles (31%) and most of g-C 3 N 4 -based photocatalysts in TC degradation. Moreover, the PCN/AgBr/rGO shows high photocatalytic stability due to the significantly photocatalytic stability after four photo-degradation cycles. This study highlights the potential application of PCN/AgBr/rGO highly efficient waste water purification.
研究领域:
环境科学
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材料科学
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光催化
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产品关联
DOI
高影响因子
Catalysis Science & Technology
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2019
·Vol. 9
·期 9
·2103-2110
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IF 5.726
Shuhui Liang,Yukun Chang,Yue Wang,Dafeng Zhang,Xipeng Pu
A simple combustion method was reported to prepare a novel BiOBr:Yb3+,Er3+/AgBr (BYE/AgBr) heterojunction photocatalyst. Phase composition, morphology and optical properties of samples were characterized. The diffuse reflectance and photoluminescence spectra showed that the as-synthesized BYE/AgBr can be activated under both visible (vis) and near-infrared (NIR) light. Notably, BYE/AgBr composites exhibited enhanced photocatalytic activity for RhB degradation under vis/NIR irradiation. The degradation rate constants of BYE/AgBr-1 : 1.5 for RhB were 0.0220 min−1 and 0.01368 h−1 under visible and NIR irradiation, which are about 2.6 and 4.9 times higher than that of pure BYE, respectively. The upconversion effect of Er3+ can convert the NIR light (∼980 nm) to visible light which was then absorbed by BYE/AgBr to generate e− and h+. Moreover, the formation of the heterojunction also plays a role in the enhanced vis/NIR photocatalytic abilities; and a corresponding plausible photocatalytic mechanism was proposed.
研究领域:
材料科学
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光催化
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Xiao Zhang,Bin Ren,Xi Li,Yanhua Xu,Biming Liu,Peng Yu,Yongjun Sun,Danhua Mei
In this study, graphitic carbon nitride (g-C 3 N 4 ) (CN) was conveniently and environmentally modified into a stable and easily recyclable photocatalyst for the high removal efficiency of dye contaminants in water. Magnetic carrier (CN/Fe 3 O 4 ) and heterojunction photocatalysts (Ag@AgBr/CN/Fe 3 O 4 ) were prepared by ultrasonic and in situ deposition of Fe 3 O 4 and Ag@AgBr nanoparticles on the CN , respectively, and characterized by the surface structure, optical, and electrochemical properties. The effects of different catalysts, silver loading, catalyst dosage, and different aeration conditions on the photocatalytic degradation of RhB were investigated. Results exhibited that the removal rate of RhB by Ag@AgBr/CN/Fe 3 O 4 reached 96% within 150 min when the Ag loading was 5%, the catalyst dosage was 0.4 g/L, and the aeration was air. Furthermore, the degradation rate constant was 17.3 × 10 −3 min −1 , which was 4.3 and 3.4 times higher than that of CN and CN/Fe 3 O 4 , respectively. The stability study demonstrated that Ag@AgBr/CN/Fe 3 O 4 had almost no risk of Ag and Fe leakage and showed high stability. Mechanism study indicated that the construction of Z-scheme heterojunction between Ag@AgBr and CN and trapping electron by Fe 3+ promoted charge transfer and electron–hole pair separation, thus enhancing photocatalytic activity.
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
CARBOHYDRATE POLYMERS
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2023
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IF 11.2
Feng Xiao,Yewen Xiao,Wei Ji,Linlin Li,Yimeng Zhang,Minmin Chen,Hualin Wang
Ethylene (C 2 H 4 ) and pathogenic microorganisms are the two major causes of the deterioration of postharvest fruits and vegetables (F&V). Hence, the development of active packaging with C 2 H 4 scavenging and bactericidal activities is urgently desirable. Herein, a novel photocatalytic active film (CS-PC-AC) is developed for banana preservation by incorporating WO 3 /AgBr/Ag photocatalyst (PC) and activated carbon (AC) into chitosan (CS). The fabricated PC is a ternary Z -scheme heterojunction and its high photocatalytic activity is achieved by the bridge of Ag between WO 3 and AgBr through rapid transfer and separation of photogenerated electrons and holes. AC plays an indispensable role in the photocatalytic reaction through molecule adsorption and transport. PC and AC are hydrogen bonded with chitosan and their incorporation has slight effect on film's thermal stability but decreases the film's mechanical and barrier properties to some extent. CS-PC-AC exhibits strong bactericidal activity (killing ~100 % of Escherichia coli and Staphylococcus aureus within 3 h) and good C 2 H 4 scavenging activity (C 2 H 4 scavenging rate of 49 ± 2 %) under visible light irradiation , which can extend the banana shelf-life by at least 50 % at 25 °C. These results indicate the good perspective of CS-PC-AC in the delay of the deterioration of postharvest F&V.
研究领域:
食品科学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Zhengqing Cai,Yougui Song,Xibiao Jin,Chong-Chen Wang,Haodong Ji,Wen Liu,Xianbo Sun
A highly solar active AgBr/h-MoO 3 composite was constructed by a facile precipitation method, and the charge separation tuning was achieved by photoreduction of AgBr. The photoreduced Ag 0 on AgBr/h-MoO 3 acted as charge transfer bridge to form Z-scheme heterostructure, while the high degree of Ag reduction converted the material into type-II heterostructure. The synthesized optimal material promoted charge separation and visible light activity due to the incorporation of highly solar active AgBr, which showed ca. 2 times activity on trimethoprim (TMP) degradation than h-MoO 3 . The contribution of reactive species on TMP degradation followed the order of O 2 − > 1 O 2 > h + , which agree well with the proposed charge separation mechanism. The photocatalytic degradation mechanism of TMP was proposed based on the radical quenching, intermediate analysis and DFT calculation. The toxicity analysis based on QSAR calculation showed that part of the degradation intermediates are more toxic than TMP, thus sufficient mineralization are required to eliminate the potential risks of treated water. Moreover, the material showed high stability and activity after four reusing cycles, and it is applicable to treat contaminants in various water matrix. This work is expected to provide new insight into the charge separation tuning mechanism for the AgX based heterojunction , and rational design of highly efficient photocatalysts for organic contaminants degradation by solar irradiation.
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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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2025
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IF 5.4
Xiaohua Zheng,Zhongchen Chen,Chenbin Cai,Huilin Han,Ruomeng Zhang,Jingting Yang
In recent years, ternary heterojunction catalysts have emerged owing to their exceptional properties for integrating the advantages of various materials, enabling the efficient separation of photoinduced charges and enhanced redox performance. In this study, a novel dual Z -scheme g-C 3 N 4 /Ag 6 Si 2 O 7 /AgBr (CNASAB) photocatalyst was prepared using a one-step coprecipitation method. Its catalytic performance was assessed through the photodegradation of tetracycline hydrochloride (TC) and Rhodamine B (RhB). The results showed that among various CNASAB compositions, CNASAB6 exhibited the highest catalytic activity. The catalyst achieved complete degradation of RhB within 6 min under visible light irradiation, with catalytic rates 73.7, 53.0, and 6.8 times higher than those of the individual components, g-C 3 N 4 , Ag 6 Si 2 O 7 , and AgBr, respectively. Additionally, the catalyst exhibited significant degradation of TC with an efficiency of 63.38 % within 2 min, indicating a broadened degradation ability. Ultraviolet-visible diffuse reflectance spectroscopy, photoluminescence spectroscopy and electrochemical impedance spectroscopy analyses confirmed that the ternary heterojunction broadened the spectral response range, reduced electrochemical impedance, and improved the separation of photoinduced electron-hole pairs. The successful construction of this ternary heterojunction not only provides a promising strategy for the photocatalytic degradation of organic pollutants but also has substantial potential for environmental purification applications.
研究领域:
材料科学
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环境科学
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光催化
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纳米技术
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化学工程
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Bing Feng,Zhengying Wu,Jinsong Liu,Kongjun Zhu,Ziquan Li,Xin Jin,Yindi Hou,Qingyang Xi,Mengqi Cong,Pengcheng Liu,Qilin Gu
Inspired by the natural photosynthesis in green plants, artificial heterogeneous Z-scheme photocatalytic systems are widely used to settle environmental concerns and energy crises, and their excellent characteristics come from long-term stability, wide absorption range, high charge-separation efficiency, and strong redox ability. However, the contribution of the surface-adsorbed dyes antenna molecule is seldom considered in the process of Z-scheme photocatalysis. In this study, we construct AgBr quantum dots decorated MoO 3 nanobelts as a novel Z-scheme photocatalyst by an oriented diffusing and charge induced deposition. For the first time, we find the synergistic effect caused by the suitable energy band match among RhB dyes, AgBr nanoparticles, and MoO 3 nanobelts, leading to the ultrafast dye-sensitized-assisted electron transfer process. This is responsible for excellent photocatalytic activities of the achieved AgBr/MoO 3 monolithic catalyst for degrading RhB under visible light irradiation. Simultaneously, changing of the band gaps and detailed mechanism for high efficiency degradation is analyzed and explored by theoretical calculations and designing further experiments. It is proposed that ultrafast degradation of the RhB on the AgBr/MoO 3 nanocomposites is due to both the photocatalytic process and the dye sensitization; the superoxide radical O 2 − , which is produced by accumulated dye-sensitization-induced abundant electrons with powerful potential in the CB of AgBr accompanying by quick combination of electrons in the CB of MoO 3 with photogenerated holes in the VB of AgBr, is a dominant reactive species for the degradation of RhB under visible light irradiation.
研究领域:
环境科学
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材料科学
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光化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Jiangli Sun,Yanping Hou,Zebin Yu,Lingli Tu,Yimin Yan,Shanming Qin,Shuo Chen,Danquan Lan,Hongxiang Zhu,Shuangfei Wang
It is urgently needed to develop high-performance materials that can synchronously remove heavy metals and organic pollutants . Herein, the visible-light responsive Zn 3 In 2 S 6 /AgBr composites were prepared for concurrent removals of metronidazole (MNZ) and Cr (VI). In the Cr (VI)-MNZ coexisting system, the removals of MNZ and Cr (VI) using the optimized Zn 3 In 2 S 6 /AgBr-15 photocatalyst reached 98.2% and 94.8% within 2 h, respectively; higher than those using counterparts. The radical species trapping and electron spin resonance (ESR) results demonstrated that ·OH was the most dominated species for MNZ oxidation , and photo-generated electrons were responsible for Cr (VI) reduction. Besides, slight competition for ·O 2 ˉ during the simultaneous MNZ degradation and Cr (VI) reduction occurred. Energy band structure analysis, ESR and the outstanding photocatalytic performance for MNZ and Cr (VI) removals demonstrated that the Zn 3 In 2 S 6 /AgBr-15 was a Z-scheme photocatalyst, which promoted photo-induced carrier′s separation. Possible MNZ degradation pathways and mechanism over the Z-scheme Zn 3 In 2 S 6 /AgBr were also proposed based on the identified intermediates. This study could inspire new ideas for design of efficient Z-scheme photocatalysts for wastewater treatment .
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
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Tianqi Liu,Hailian Huang,Yunzong Liu,Konstantinos Papadikis,Beata Layla Mehdi,Pow-Seng Yap,Graham Dawson
A novel magnetic quinary nanocomposite, protonated g-C 3 N 4 /Fe 3 O 4 /AgBr/AgCl/AgI, was synthesized using a wet chemical method. The multi-heterojunction photocatalyst with multi carrier source and multi-channel carrier transport is constructed to enhance the photocatalytic degradation performance of pure g-C 3 N 4 . The design of the quinary nanocomposite is also an effective approach solving the chemical stability problem of silver halides. The photocatalytic degradation efficiency under visible light irradiation was analyzed for methylene blue (MB) as the target organic pollutant. The quinary nanocomposite with 10 % g-C 3 N 4 displayed high photocatalytic performance, with 83 % of MB degraded under 6 h LED white light irradiation. The effective quinary nanocomposite has good magnetic properties and can be magnetically separated to prevent secondary pollution of the photocatalyst in water. The band gap of protonated g-C 3 N 4 /Fe 3 O 4 /AgBr/AgCl/AgI was found to be lower than pure g-C 3 N 4 . Parameters such as initial concentration of pollutant, initial solution pH, and light source were studied. Zeta potential results showed that the quinary nanocomposite could disperse homogenously to decrease aggregation in the solution. The photocatalytic mechanism was investigated, and the mineralization results were analyzed based on liquid chromatography-mass spectroscopy (LC-MS) and total organic carbon (TOC). It was found that the hydroxyl and superoxide radicals were major reactive species by scavenging experiments. Additionally, protonated g-C 3 N 4 /Fe 3 O 4 /AgBr/AgCl/AgI nanocomposite showed excellent reusability after magnetic separation and regeneration, thus suggesting it to be a promising photocatalyst for treating wastewater containing organic contaminants.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Youyong Pang,Lingjun Song,Changfeng Chen,Lei Ge
A one-step, facile, template-assisted synthetic route was applied to synthesize hollow porous tetrahedron-shaped Ag@AgBr plasmonic photocatalysts in situ. CuBr tetrahedrons were used as both the template and source of bromine and copper to produce AgBr and reduce Ag + ions into metallic Ag, respectively. The novel Ag@AgBr photocatalysts could be easily obtained using this route. The valence of Ag (i.e. 0 or 1+) in the Ag@AgBr photocatalysts could be precisely controlled by the relative amount of AgNO 3 to CuBr in the precursor solution. Photocatalytic performance of the Ag@AgBr plasmonic photocatalysts with different Ag to AgBr ratios was estimated by the decomposition of an organic dye (rhodamine b or RhB) and colorless phenol, under artificial simulated sunlight irradiation. When the molar ratio of AgNO 3 : CuBr was 1:1, the as-obtained Ag@AgBr photocatalyst (denoted as Ag@AgBr (1:1)) was capable of decoloring 98% of the RhB within 5 min and the degree of mineralization was 67.1%, the best photocatalytic activity exhibited by the photocatalysts. The decomposition of phenol further confirmed the superior photocatalytic activity of Ag@AgBr (1:1) sample. The synthetic method employed in this work could enable controlled synthesis of other novel thin-shelled structures.
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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DOI
高影响因子
ELECTROCHIMICA ACTA
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2019
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IF 5.383
Xiaorong Zhang,Muhammad Shakeel,Baoshan Li,Lei Wang
Advanced photo-/electrocatalyst is devoted for O 2 and H 2 evolution reactions (OER and HER) with immense quantum conversions efficiency. Herein, a novel foamed zinc oxide-silica spheres and Ag–AgBr nanocomposite (Ag–AgBr/FZSS) was engineered and passes through a complete characterization profiling. The Ag–AgBr/FZSS possesses the distinctive porous surface with open cavities. The hierarchical morphology provides many active sites and mesoporous conducting channels for visible light absorption and charge carriers transportation. The Ag–AgBr/FZSS act as outperformed photo-/electrocatalyst for OER (overpotential 348 mV @ 10 mAcm −2 ) and HER (potential −217 mV @ 100 mAcm −2 ). While under illumination conditions it reduced to 337 mV and −195 mV with high quantum conversion efficiency (37.5%). The lustrous durability further justified as a highly efficient photo-/electrocatalyst for renewable energy conversions.
研究领域:
材料科学
·
环境科学
·
能源科学
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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）