JOURNAL OF ALLOYS AND COMPOUNDS
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2012
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IF 2.289
Yafang Zhang,Guangfang Li,Xiaohui Yang,Hao Yang,Zhong Lu,Rong Chen
Monoclinic bismuth vanadate (m-BiVO 4 ) micro-/nanostructures with different sizes and morphologies were successfully prepared via a facile and rapid microwave and ultrasonic wave combined technique. The obtained BiVO 4 products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and UV–vis diffuse reflection spectroscopy (DRS). It was found that the solvent and pH value had a significant influence on morphology, size and crystalline structure of the product. Nut-like, potato-like and broccoli-like monoclinic BiVO 4 were fabricated in different solvents. The crystal phase could be modulated by varying the pH value of reaction system. The photocatalytic activities of the products were also evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation. The result revealed that the photocatalytic activities of BiVO 4 nanostructures were closely related to the crystalline phase, band gap and particle size. Monoclinic BiVO 4 nanoparticles with small crystal size and large band gap exhibited remarkable photocatalytic performance.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xiaoqian Dong,Xiaochen Yu,Xu Zhang,Zhehan Zhang,Xiao He,Ruru Wei,Youru Bai,Jibin Fan
Tb-ZnO/reduced graphene oxide (Tb-ZnO/RGO) nanocomposites were prepared by a simple one-step solvothermal method. The samples were characterized by XRD , SEM, XPS, BET, FT-IR, and Raman spectroscopy , and their photocatalytic activities toward different pollutants (RhB, MO, PR, and MB) degradation were evaluated. Tb-ZnO/RGO nanocomposite shows enhanced photocatalytic activity with high kinetic constants (0.04 min −1 ) and good stability. Enhanced charge separation and migration have been analyzed using UV–Vis absorption spectra , PL spectra, and EIS analysis. Improved photocatalytic activity can be ascribed to the smaller band gap, larger specific surface area (28.3478 m 2 /g) and more effective separation and transport of photogenerated carriers by Tb 3+ and RGO. All the results show that the nanocomposite catalyst has a good application prospect in the degradation of pollutants.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jun Feng,Tao Jiang,Yingchun Han,Otieno Kevin Okoth,Ling Cheng,Jingdong Zhang
A dual Z-scheme Bi 2 S 3 /Bi 2 O 3 /WO 3 ternary film was constructed via a controllable reduction of peroxotungstate by ethanol, calcination of Bi (NO 3 ) 3 and in situ anion exchange of Bi 2 O 3 with sulfide. The as-prepared composite film was characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The UV–visible diffuse reflectance spectroscopic and photoluminescence studies indicated that the introduction of Bi 2 S 3 in Bi 2 O 3 /WO 3 film effectively improved the absorption of the film in the visible region and suppressed the recombination of photogenerated carriers. The photoelectrocatalytic activity of the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was evaluated by decoloration of Rhodamine B under visible light illumination. Compared with WO 3 and Bi 2 O 3 /WO 3 films, the Bi 2 S 3 /Bi 2 O 3 /WO 3 film exhibited much higher degradation efficiency. Moreover, the enhanced visible light photoelectrocatalytic activity of the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was also demonstrated by efficient degradation of diclofenac. According to the reactive oxygen species detected by electron spin resonance, a dual Z-scheme system formed in the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was proposed, which offered a new approach to the construction of semiconducting composite film with high photoelectrocatalytic performance for pollutant removal.
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CHEMICAL PHYSICS LETTERS
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2019
·
IF 1.901
Ruijie Yang,Jiansheng He,Kelin Song,Yingying Fan,Fei Tian,Rongshu Zhu
Different graphene size can affect the catalytic activity of the photocatalyst. In this work, a series of ZnIn 2 S 4 /graphene catalysts with different graphene sizes were synthesized, characterized and their photocatalytic activities were evaluated by photocatalytic hydrogen evolution. The different sizes (k) of graphene can be separated by differential centrifugation, with the decrease of graphene size, the activity of hydrogen production of the catalyst under visible light increases first and then decreases, when k = 5–7 μm, the maximum hydrogen production rate was 40.85 μmol/g·h. Furthermore, the relationship between the photocatalytic hydrogen production activity of ZnIn 2 S 4 /graphene and its physicochemical properties were further analyzed.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Xiaojin Fu,Sijie Li,Jing Wen,Fuyan Kang,Congying Huang,Xiaogang Zheng
ZnFe 2 O 4 -coated Ag nanowires (Ag@ZnFe 2 O 4 NWs) were prepared for the photo-Fenton induced dehydration of fructose into 5-hydroxymethylfurfural (5-HMF) in visible light region. Effects of ZnFe 2 O 4 content, volume ratio of dimethyl sulfoxide (DMSO) to deionized water, reaction temperature, fructose dosage, H 2 O 2 content, pH values, inorganic ions, and quenchers on the fructose conversion, 5-HMF yield, and 5-HMF selectivity were performed in detail. Among these obtained composites, Brønsted acidic Ag@ZnFe 2 O 4 NWs with Ag NWs diameter of around 20 nm and ZnFe 2 O 4 coating of 6.13 wt% exhibit the best photo-Fenton catalytic activity for the conversion of fructose into 5-HMF, and slightly deactivate after five cycle times. The surface plasmon resonance effect of Ag NWs and the synergistic effect between ZnFe 2 O 4 and Ag NWs are favorable for the visible light absorption and the efficient transfer and separation of charge carriers. DMSO as well as OH radical plays the vital role in the photo-Fenton induced dehydration of fructose into 5-HMF.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
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IF 8
Xiaoyan Huang,Wanlu Sun,Yanyan Zhu,Chao Zhao,Baojin Tan,Hai-Yan Wang,Yi Liu
Photodynamic therapy (PDT) could induce apoptosis by releasing reactive oxygen species (ROS) to treat tumor. Application of pH/light dual-activated nanoparticles could generate ROS in the acidic tumor microenvironment under 808 nm laser irradiation for precise treatment. L-arginine (L-Arg) triggered by ROS is an efficient nitric oxide (NO) donor for gas therapy. In addition, it is reported that peroxynitrite (ONOO - ) produced by rapid reaction of ROS and NO could sensitize PDT and induce apoptosis for synergistic treatment. Herein, we developed the L-Arg loaded pH/light dual-activated PEGylated photosensitizer for self-assembly into nanoparticles named Rho-Arg. As measured by fluorescence spectroscopy, the pKa of Rho-Arg was 5.5, which is suitable for applying in the tumor microenvironment. The nanoplatform was firstly activated under the acidic condition of tumor, and then illuminated by 808 nm laser to controllably release ROS, and sequentially produced NO and ONOO - . In conclusion, the Rho-Arg nanoplatform may provide a promising synergistic therapy tool for tumor treatment.
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Materials Today Chemistry
·
2024
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IF 6.7
Keke Zhang,Fengwei Huang,Xiaoyun Dong,Kanghui Xiong,Xianjun Lang
To optimize the activity at the molecular level, conjugated microporous polymers (CMPs) can be tailored through monomers for visible light photocatalysis . Benzotrithiophene (BTT) is the select monomer for CMPs because of its planar and electron-rich properties. Notably, the sp 2 -carbon conjugation of BTT is highly desirable to facilitate electron transfer . Herein, the condensation of 1,4-phenylenediacetonitrile and 4,4′-biphenyldiacetonitrile with benzo[1,2-b:3,4-b':5,6-b'']trithiophene-2,5,8-tricarbaldehyde assembles two CMPs, sp 2 c-BTT-CMP-1 and sp 2 c-BTT-CMP-2, respectively. Systematic materials characterizations and density functional theory calculations on sp 2 c-BTT-CMP-1 and sp 2 c-BTT-CMP-2 are performed to interpret the essential optoelectronic attributes. Due to the different linkages and π-conjugations, sp 2 c-BTT-CMP-2 presents a better built-in electric field than sp 2 c-BTT-CMP-1, edging toward facile dissociation and fast transport of charge carriers. Consequently, sp 2 c-BTT-CMP-2 is superior to sp 2 c-BTT-CMP-1 for the green light-triggered oxidation of amines to imines with dioxygen. This study underlines the promising aspect of BTT-based CMPs with a fitting linkage as state-of-the-art functional materials for semiconductor photocatalysis.
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高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 21
·7796-7807
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IF 6.482
Yao-Yao Wang,Xue-Yang Ji,Meng Yu,Jun Tao
Inhibition of the recombination of photo-induced electrons and holes is critical for light harvesting and enhancing the photocatalytic efficiency of hydrogen production in metal–organic frameworks (MOFs). Herein, Cs3Bi2I9 (CBI) quantum dots (QDs) were firstly loaded into the inner pores of MOF NH2-UiO-66 (U6N) through an anti-solvent recrystallization (ASR) method. The light adsorption wavelength of the MOF composite was significantly extended to the visible region, and remarkably, the complementary electronic band structures between MOF and CBI resulted in spatial separation of photogenerated electron–hole pairs in this material. Thereby, under visible light irradiation, the prepared catalysts exhibited high H2 production activity of 32.21 μmol g−1 h−1 that originated from photocatalytic proton reduction without introducing noble metals, far surpassing the MOF and CBI counterparts. In addition, under the synergistic effect of CBI QDs and low-coordination Pt metal clusters, the photocatalytic hydrogen production rate can be further improved to 141.87 μmol g−1 h−1 with a TON value of 17.74. The electron migration mechanism among CBI and U6N, and the microstructure of low coordination Pt clusters was also investigated through transient absorption spectra (TAS) and X-ray absorption spectra (XAS).
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ELECTROCHIMICA ACTA
·
2014
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IF 4.086
Man Zhang,Changzhu Yang,Wenhong Pu,Yuanbin Tan,Kun Yang,Jingdong Zhang
ABSTRACT The heterojunction films of WO 3 /TiO 2 were prepared by liquid phase deposition (LPD) method via two-step processes. The scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopic analysis indicated that flower-like WO 3 film was successfully deposited on TiO 2 film with the LPD processes. The TiO 2 film provided an excellent platform for WO 3 deposition while WO 3 obviously expanded the absorption of TiO 2 film to visible light. As the result, the heterojunction film of WO 3 /TiO 2 exhibited higher photocurrent response to visible light illumination than pure TiO 2 or WO 3 film. The photoelectrocatalytic (PEC) activity of WO 3 /TiO 2 film was evaluated by degrading Rhodamin B (RhB) and 4-chlorophenol (4-CP) under visible light irradiation. The results showed that the LPD WO 3 /TiO 2 film possessed high PEC activity for efficient removal of various refractory organic pollutants.
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Journal of Central South University
·
2022
·Vol. 29
·期 5
·1447-1462
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IF 2.392
Yang Ting,Hu Xin-yu,Wang Jun-tao,Yang Tian-li,Wang Wen-lei
A series of In x Sb 2− x S 3 nanosheets modified g-C 3 N 4 (In x Sb 2− x S 3 -TCN) heterojunctions with different g-C 3 N 4 contents were fabricated by an in situ deposition method. All the In x Sb 2− x S 3 -TCN composites were applied as photocatalysts in Cr(VI) polluted water treatment and the results displayed that In x Sb 2− x S 3 -TCN could effectively remove Cr(VI) under visible light through synergistic effects of adsorption and photocatalytic reduction. Especially, In x Sb 2− x S 3 -TCN-70 (70 mg g-C 3 N 4 ) exhibited the most excellent adsorption and photocatalytic reduction performance among all composites, which possessed a high equilibrium adsorption capacity of 12.45 mg/g in a 30.0 mg/L Cr(VI) aqueous solution, and reduced Cr(VI) to Cr(III) within 10 min under visible light irradiation. DRS and PL results indicated that the interfacial coupling effect between g-C 3 N 4 and In x Sb 2− x S 3 enhanced the utilization efficiency of visible light and suppressed photoinduced carrier recombination, which improved the photocatalytic activity of composites. Moreover, the photocatalyst exhibited satisfactory reduction activity and good stability after 5 cycles of Cr(VI) adsorption-photoreduction.
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Journal of Nanostructure in Chemistry
·
2021
·Vol. 12
·期 2
·193-205
·
IF 6.391
Zhao Chunqi,Jing Tao,Tian Jingzhi,Guo Jiang,Wu Min,Shi Danni,Zhao Zhiyuan,Guo Zhanhu
Developing a rapid and sensitive photo-electrochemical (PEC) sensing platform for glucose detection is highly desirable. Herein, a visible light-driven PEC enzyme biosensor for sensitive detection of glucose was proposed, employing reduced graphene oxide/titania (TiO 2 ) nanotubes (RGO/TNTs) as photoactive materials and glucose oxidase (GOD) as the identification element. The RGO/TNTs composites were synthesized via a facile hydrothermal process. Notably, the unique nanostructure system significantly increases the absorption in the visible region and effectively separates the photo-generated electron–hole pairs, which is essential for promoting the PEC activity. In the presence of dissolved oxygen, the GOD immobilized on the modified electrode could specifically catalyze the electro-oxidation of glucose to produce H 2 O 2 , resulting in an increase of photocurrent intensity. Based on the variation of the photocurrent response, the constructed PEC enzyme biosensor exhibited high sensitivity with a wide linear range from 10 –2 to 10 mM and a low detection limit of 5.0 μΜ. Meanwhile, the potential applicability of the PEC enzyme biosensor was evaluated by detecting glucose in human serum samples, and satisfactory results were obtained. Graphic abstract The PEC enzyme biosensor based on RGO/TNTs composites successfully realized the sensitive detection of glucose and displayed good selectivity, high stability and satisfactory repeatability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 32
·32466-32477
·
IF 2.8
Cui Peipei,Hu Yun,Zheng Mengmeng,Wei Chaohai
Graphitic-like carbon nitride (g-C 3 N 4 ) photocatalyst was synthesized by a facile chemical pyrolysis method, which was built on the self-condensation of different precursors to generate g-C 3 N 4 , e.g., melamine, urea, and thiocarbamide. And the different precursors produced a great influence on the photocatalytic activities of g-C 3 N 4 . Heterojunctions of g-C 3 N 4 and BiVO 4 were synthesized using a facile solvent evaporation method. The formation of BiVO 4 /g-C 3 N 4 composites were confirmed by XRD, FT-IR, SEM, XPS, and UV-Vis DRS. The photocatalytic activities for RhB degradation were evaluated under visible-light irradiation. The photocatalytic activity of g-C 3 N 4 prepared by urea was higher than that of g-C 3 N 4 prepared by melamine and thiocarbamide, which was attributed to its favorable dispersibility, larger specific surface area, and higher oxidation capacity. The heterojunction composites exhibited higher photocatalytic activity than pure g-C 3 N 4 or BiVO 4 . The results showed obvious removal efficiency for RhB, and the optimal sample with a BiVO 4 content of 10% exhibited higher efficiency than pure g-C 3 N 4 and BiVO 4 , and 10 wt%BiVO 4 /CN-U showed the highest photocatalytic activity. The enhanced photocatalytic activity of BiVO 4 /g-C 3 N 4 composite can be attributed to the intimate coupling between the two host substrates, resulting in an efficient charge separation.
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