APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Zhaoyang Li,Yongjie Zhao,Qing Guan,Qian Liu,Sara Khan,Leilei Zhang,Xianze Wang,Lei Chen,Xia Yang,Mingxin Huo
Photocatalytic reduction of nitrate has attracted much attention recently, however, low efficiency and difficult separation have limited its application in practice. In this study, the novel direct dual Z-scheme AgBr(Ag)/MIL-101(Cr)/CuFe 2 O 4 (AB/M/CFO) was fabricated by the hydrothermal technology combined with the photodeposition method for the first time. The AB/M/CFO exhibited the highest nitrate conversion and nitrogen selectivity (79.9% and 94.5%, respectively) compared to AgBr(Ag)/MIL-101(Cr), MIL-101(Cr) and CuFe 2 O 4 for 30 min UV-light irradiation. The dual Z-scheme of AB/M/CFO enhanced electron transfer and charge separation, which was proved by transient photocurrent responses, leading to a significant improvement in photocatalytic efficiency. Meanwhile, after four cycles, the AB/M/CFO photocatalyst also displayed a strong magnetic separation ability and excellent recycling stability. Furthermore, the excitation and electron transfer process over dual Z-scheme AB/M/CFO photocatalytic material were proposed, based on the radical trapping experiments. Our work provides a new strategy to construct dual Z-scheme MOFs-based materials that have promising applications in photocatalytic reduction of pollutants.
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
RSC Advances
·
2018
·Vol. 8
·期 60
·34428-34436
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IF 2.936
Sihui Zhan,Qianlei Hou,Yi Li,Shuanglong Ma,Pengfei Wang,Yanan Li,Haitao Wang
Visible-light-driven photocatalytic disinfection is highly desired for water treatment due to its advantages such as wide applicability and being free of disinfection byproducts. In this study, AgBr/g-C3N4 hybrid nanocomposites were evaluated as photocatalysts under visible light irradiation for water disinfection using Escherichia coli as a model pathogen. The physicochemical and photo-electrochemical properties of the photocatalyst were systematically characterized using advanced techniques including scanning electron microscopy (SEM), transmission electron microscopy (HRTEM), powder X-ray diffraction (XRD), UV-visible diffuse reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectra and electron spin resonance (ESR) spectroscopy. The inactivation mechanism of E. coli was systematically investigated by monitoring the morphology change of the bacteria and analyzing the role of reactive species. The optimized AgBr/g-C3N4 hybrid photocatalyst exhibited remarkably enhanced visible-light-driven photocatalytic disinfection performance towards E. coli over that of pure g-C3N4 and AgBr under visible light, which could completely inactivate 107 cfu mL−1 E. coli in 90 min. Quenching studies indicated that h+ is the main reactive species responsible for inactivating E. coli. The mechanism study revealed a Z-scheme charge transfer mechanism between AgBr and g-C3N4. The g-C3N4 could effectively trap the photogenerated conduction band electrons of AgBr via a Z-scheme type of route, thus significantly promoting the electron–hole separation. The trapping of electrons by g-C3N4 could facilitate h+ accumulation, which accounts for the better disinfection performance of AgBr/g-C3N4 compared to AgBr and g-C3N4.
研究领域:
环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 22
·26465-26479
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IF 2.478
Zhu Wanrong,Song Jimei,Wang Xule,Lu Yun,Hu Gang,Yang Jie
A series of Ag/AgBr/BiOBr photocatalysts with different weight contents of Ag/AgBr were successfully constructed via a simple precipitation method in 80 °C water bath. Photocatalysts were characterized by XRD, XPS, SEM, TEM, N 2 Adsorption-Desorption (BET), and UV–Vis Diffuse Reflectance Spectroscopy (DRS). Compared with BiOBr and Ag/AgBr, all the composite photocatalysts show the prominent photocatalytic activity for the degradation of tetracycline (TC). Especially, 1:5Ag/AgBr/BiOBr (20%) has the highest reaction rate constant (kapp = 0.20 min −1 ). Moreover, according to the results of radical scavengers runs, ·OH and h + acted as the main reactive species in the degradation process. Based on above, a possible photocatalytic mechanism for organics degradation over Ag/AgBr/BiOBr was proposed. Interestingly, the redox cycle between O 2 /·O 2 − and Br − /Br 0 assisted with the surface plasmon resonance (SPR) effect of silver dramatically promotes the separation and transfer of electron–hole pairs, and improves the photocatalytic activity of the as-obtained composite samples.
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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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 33
·14180-14188
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IF 3.288
Jingjing Zhang,Jingtao Dai,Jian Chen
To compare photodegradation processes in single- and binary-contaminant systems, a representative antibiotic (tetracycline) and insecticide (imidacloprid) were employed as two contaminants of emerging concern. Ag/AgBr modified BiOBr was synthesized hydrothermally in an ionic-liquid/water medium and characterized via various techniques to support mechanistic studies. As-prepared flower-shaped Ag/AgBr/BiOBr exhibits superior photocatalytic activity to Ag/AgBr and BiOBr. Parallel experiments were conducted in single-contaminant systems to optimize the solution chemistry for comparison studies; these suggested that the photodegradation rate (DR) is highest at 1.0 g L−1 at catalyst dosages ranging from 0.6 to 1.4 g L−1, while raising the initial concentration reduces the DR. Additionally, electrostatic interactions between the reactants and photocatalyst cause DR fluctuations at different pH values. In the mechanistic studies, the contributions of the dominant active species (˙O2− and h+) were analysed quantitatively through quenching tests with scavengers. Furthermore, electrostatic interactions between the reactants and the active species result in non-equilibrated contributions from ˙O2− and h+ in single-contaminant systems. Comparison studies distinctly demonstrated a synergistic effect in binary-contaminant systems, which is caused by the mutually complementary utilization of h+ and ˙O2− during the photodegradation of tetracycline and imidacloprid.
研究领域:
环境科学
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催化材料
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产品关联
DOI
高影响因子
CHEMICAL PAPERS
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2019
·Vol. 73
·期 8
·1971-1978
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IF 1.246
Liu Xiue,Sun Chen,Yue Yundi,Yan Tingjiang,He Yuanchun,Yu Yang,Li Wenjuan,Wang Wenliang,Zhu Kunlei,Jing Zhihong
Three-dimensional (3D) AgBr/TiO 2 microspheres with remarkable sea urchin-like architectures were prepared by a solvothermal-hydrothermal two-step process. The products have been characterized through XRD, SEM, HRTEM and Nitrogen adsorption–desorption analysis. The antibacterial activity of the 3D AgBr/TiO 2 microspheres against Escherichia coli ( E. coli ) was investigated quantitatively by microcalorimetric method for the first time. Meanwhile, the visible-light photocatalytic performance of the 3D AgBr/TiO 2 microspheres was also evaluated for the degradation of rhodamine B (RhB). As a contrast, the same tests were carried out for the conventional AgBr/P25 (TiO 2 ). The results show that the 3D AgBr/TiO 2 microspheres prevent better antibacterial and visible-light photoctalytic performance than the conventional AgBr/P25. It revealed that unique morphology effect, the extraordinary visible-light responses of AgBr and various oxidative radicals produced by visible light irradiated 3D AgBr/TiO 2 microspheres are responsible for improved antibacterial and photocatalytic performance.
研究领域:
材料科学
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环境科学
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微生物学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Xianbo Sun,Weiyu He,Xiaodi Hao,Haodong Ji,Wen Liu,Zhengqing Cai
A novel solar active AgBr/BiOBr/TiO 2 catalyst was synthesized by a facile coprecipitation method for solar-driven water remediation . The synthesized material composed of flower-like TiO 2 nanoparticles loaded on BiOBr nanosheets and with homogeneous surface distributed Ag/AgBr nanoparticles. The internal electric field between BiOBr/TiO 2 heterojunction greatly facilitated the charge carrier migration; the introduction of narrow band gap semiconductors (AgBr and BiOBr) promoted the visible light adsorption; and the Ag/AgBr nanoparticles acted as photosensitizer to further improve the light utilization. The new material showed 7.6- and 4.0-times activity of pure TiO 2 and BiOBr under solar light, and the contribution of reactive species on anthracene degradation followed the order of h + > O 2 • − > •OH. The degradation mechanism and pathway were proposed based on intermediates analysis and DFT calculation. The QSAR analysis revealed that the environmental risks of contaminants were greatly reduced during the photocatalysis process but some intermediates were still toxic. The high photocatalytic activity, stability and adaptability all indicated that this new material owns great application potential for cost-effective photocatalytic remediation of persistent organic contaminants under solar light.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Chuanmin Ding,Xue Wang,Kaijing Song,Bing Zhang,Junwen Wang,Zhihuan Zhao,Honghong Chang,Wenlong Wei
Herein visible light was utilized as activator to enable colorimetric immunoassay to detect tumor marker based on ternary GO-C 3 N 4 -AgBr heterojunction nanophotocatalyst. Firstly, synthesized photocatalyst GO-C 3 N 4 -AgBr could oxidize TMB due to photogenerated hole and the oxidation ability was enhanced due to ternary heterojunction structure. Secondly, depending on the specific binding of antigen and antibody, the sandwich-type immunocomplex were constructed on the platform of magnetic bead with advantages of convenient cleaning and easy separation. Finally, TMB was added into the ABS buffer solution of immunocomplex. Under visible light radiation, fast change in color was observed within 10 s. Under optimal conditions, there was a linear relation between absorbance and target protein concentration in the range of 0.5 ng mL −1 –25 ng mL −1 with the detection limit of 20 pg mL −1 . Meanwhile, the developed colorimetric immunoassay displayed preferable selectivity, repeatability, and stability.
研究领域:
分析化学
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材料科学
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生物医学工程
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癌症研究
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产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
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2022
·
IF 4.969
Cong Lu,Haifeng Zhou
The easy recombination of electron-hole pairs produced by monomeric photocatalysts under light exposure severely limits their application in wastewater treatment. Based on this, BiOCOOH/Ag/AgBr ternary photocatalysts in flower-like microspheres were controllably synthesized by precipitation photoreduction and characterized by various techniques. In addition, the effects of different molar ratio of BiOCOOH and AgBr, catalyst dose, pH and coexisting ions on the photocatalytic degradation of rhodamine B (RhB) and tetracycline (TC) were investigated. The results showed that the BOC/Ag/AgBr-0.5 composite exhibited excellent photocatalytic activity for the degradation of RhB and TC. The excellent photocatalytic activity was mainly attributed to the surface plasmon resonance (SPR) effect of metallic Ag and charge transfer mechanism between composites, thus promoting charge separation. The degradation efficiency of RhB and TC was 92.7% and 72.3% with the degradation rate constant of 0.073 and 0.023 under light irradiation of xenon lamp in 30 and 45 min, respectively, which was 6 and 2 times higher than that of BiOCOOH and AgBr. The stability studies showed that BOC/Ag/AgBr-0.5 maintained a high catalytic activity after four cycles. The results of radical capture experiments showed that h + and · O 2 – were the main reactive radicals, while · OH played a secondary role in the photocatalytic system. Subsequently, a potential photocatalytic mechanism was proposed based on the experimental results.
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
INORGANIC CHEMISTRY COMMUNICATIONS
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2024
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IF 4.4
Xiaohua Zheng,Chenbin Cai,Shihui Lu,Mengnan Xu,Wei Chen,Fanger Yang
Recently, the photocatalytic degradation of organic pollutants has gained increasing attention because of its high efficiency and lack of secondary pollution; however, problems such as rapid electron–hole recombination affect its degradation efficiency. In this study, a novel dual Z-scheme g-C 3 N 4 /Ag 2 MoO 4 /AgBr heterojunction was successfully prepared using a one-step room-temperature precipitation method, with its photocatalytic activity evaluated by degrading rhodamine B (RhB) and tetracycline hydrochloride (TCH). The composition and surface morphology of the ternary catalysts—characterized using X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Brunauer–Emmett–Teller (BET) tests, and X-ray photoelectron spectroscopy (XPS)—confirmed the successful loading of Ag 2 MoO 4 and AgBr onto g-C 3 N 4 . Catalytic degradation results showed that the ternary catalyst exhibited the best performance at a 40 % mass fraction of AgBr. Moreover, the ultraviolet–visible diffuse reflectance spectra (UV–Vis DRS), photoluminescence (PL), electrochemical impedance spectroscopy (EIS), and transient photocurrent response test results show that the ternary catalyst has excellent optical properties. In addition, the significant improvement in the catalytic performance can be attributed to the effective charge separation of the dual Z-scheme photocatalytic mechanism based on radical trapping experiments, electron spin resonance (ESR) analysis, and energy band analysis. Hence, this study provides a new approach to studying more efficient photocatalysts.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Ruowen Liang,Zhoujun He,Yi Lu,Guiyang Yan,Ling Wu
Although both step-scheme (S-scheme) heterojunction and metal–organic framework (MOF) photocatalysts have been intensively studied, few efforts have been devoted to combining them to establish high-performance MOF-based S-scheme photocatalysts. In this work, binary Ag@MIL-68(Fe) (Ag@MFe) hybrids were first fabricated by decorating Ag nanoparticles (Ag NPs) onto MIL-68(Fe), an Fe-based MOF. Owing to the high specific surface area of MIL-68(Fe), the plasmonic Ag NPs were uniformly distributed on its surface. Then, AgBr particles were deposited on the Ag@MFe hybrids via precipitation to form the final ternary sandwich-like hierarchical AgBr-Ag@MFe photocatalyst. The 30 %AgBr-1.5 %Ag@MFe sample exhibited excellent photocatalytic performance for the degradation of rhodamine B under visible light irradiation ( λ ≥ 420 nm), with an effectiveness 9.2 and 2.1 times higher than those of the original MIL-68(Fe) and binary 1.5 %Ag@MFe hybrid, respectively. Furthermore, 30 %AgBr-1.5 %Ag@MFe performed as a high-efficiency bifunctional photocatalyst towards the detoxification of water contaminants (mixture of a dye and Cr(VI)). The significantly enhanced photoactivity was attributed to the effective spatial separation of photogenerated electron–hole pairs via S-scheme charge transfer. Moreover, the plasmonic Ag NPs assembled into the contact interface of AgBr and MIL-68(Fe) enhanced the vectorial interfacial electron transfer. The formation of an S-scheme heterojunction was supported by X-ray photoelectron spectroscopy and electron spin resonance studies. This novel bifunctional AgBr-Ag@MIL-68(Fe) hybrid photocatalyst system not only provides new opportunities for environmental remediation but also highlights a promising strategy to construct high-efficiency S-scheme photocatalysts.
研究领域:
材料科学
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环境科学
·
光催化技术
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 12
·6772-6783
·
IF 1.938
Hou Xiaoshuo,Yang Ming,Yu Hui,Yang Ying,Li Dan,Dong Xiangting
In this work, a 3D Z-scheme photocatalyst Ag/AgBr/Zn 3 V 2 O 7 (OH) 2 ·2H 2 O (Ag/AgBr/ZVO) was synthesized by a hydrothermal method, and a subsequent surface deposition-optical reduction technique. The prepared flower-like Ag/AgBr/ZVO was characterized by scanning election microscopy (SEM), x-ray powder diffraction (XRD), x-ray photoelectron spectroscopy (XPS), UV-vis spectrophotometry, N 2 adsorption-desorption isotherm based on Brunauer-Emmett-Teller (BET) theory, and electrochemical tests. The photocatalytic degradation performance of the catalyst was investigated by the degradation of methylene blue (MB) dye by visible light irradiation. Compared with bare Zn 3 V 2 O 7 (OH) 2 ·2H 2 O (ZVO) nanoflowers, the photocatalytic effect of the 3D Z-scheme heterojunction Ag/AgBr/ZVO was significantly enhanced. The catalyst of 2h-Ag/AgBr/ZVO exhibited the strongest photocatalytic activity, of which the MB degradation rate is about 98.8% in 100 min, which was about five times that of pure ZVO. The increase in the photodegradation rate is ascribed to the accelerated interface charge-transfer process, the faster photogenerated carrier separation rate and the enhancement of visible light absorption. In view of the trapping of the reaction intermediate and the electron spin resonance (ESR) measurement, we propose a possible Z-scheme photocatalytic mechanism. This improved visible-light response likely originates from a synergistic effect of the different components. This work offered an ideal method for producing stable, efficient, and recyclable photocatalysts suitable for use in the visible light range.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Journal of Cleaner Production
·
2020
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IF 7.246
Yingying Shi,Zhuan Yan,Yingtao Xu,Tian Tian,Jing Zhang,Jianfeng Pang,Xihua Peng,Qianghua Zhang,Mingli Shao,Wenyi Tan,Hailun Li,Qingping Xiong
Tetracycline hydrochloride (TC) wastewater has complex components, high concentration of organic matter and certain biological toxicity. Photocatalytic degradation is of great application prospect due to its green, thorough and efficient removal of TC. In this study, heterojunction photocatalyst supported on Palygorskite (Pal) AgBr–TiO 2 -Pal with visible light response was successfully prepared via sol-gel and liquid deposition method successfully. Taking TC as the target pollutant, the photocatalytic performance of AgBr–TiO 2 -Pal photocatalys excited by visible light was studied. The spreading/grafting of AgBr–TiO 2 on the surface of Pal was improved by a series of structural characterization and composition analysis. The results also demonstrated that the specific surface area of AgBr–TiO 2 -Pal was about 48.06 m 2 ⋅g −1 with uniform mesoporous slit. The AgBr–TiO 2 -Pal catalyst was very effective for the degradation of TC, and it still retained its high stability and reusability after five cycles. The results showed that under the best reaction conditions (initial concentration of tetracycline 10 mg⋅L −1 , catalyst dosage 0.5 g⋅L −1 , pH value 9), with the excitation of visible light, the maximum removal ratio of TC was 90%, and the mineralization ratio was 67%. The removal efficiency and degradation rate of TC by AgBr–TiO 2 -Pal catalyst were 2.17 and 4.75 times as much as those of TiO 2 respectively. The outstanding photocatalytic performance of heterogeneous AgBr–TiO 2 -Pal catalyst was obtained by fully participate in the reaction by photoinduced charge. This study could be expected to be used in photocatalytic degradation of antibiotic pollutants in wastewater treatment .
研究领域:
环境科学
·
化学
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材料科学
·
废水处理
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DOI
高影响因子
危险品化学品经营许可证（带存储）