MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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IF 4.2
Min Yuan,Ke Huang,Dongqing Dai,Hongfei Yin,Wei Zhao,Yixin Jiang,Yahui Feng
The integration of heterogeneous photocatalysts has emerged as a promising approach to boost the effectiveness of photocatalytic reactions for hydrogen evolution. In this study, we explore the synergistic effects of Ti 3+ -TiO 2 /P-doped g-C 3 N 4 heterojunctions on the enhancement of visible light-induced hydrogen generation efficiency. The photocatalytic hydrogen evolution performance of the as-prepared TPCN100 (280.38 μmol g −1 h −1 ) surpasses that of pristine P-doped g-C 3 N 4 (34.89 μmol g −1 h −1 ) and Ti 3+ -TiO 2 (39.71 μmol g −1 h −1 ) by factors of 8.0 and 7.1 respectively. Through a comprehensive investigation of the structural, electronic, and photocatalytic properties, the underlying mechanisms accountable for the observed enhancement in efficiency within the heterojunction system were elucidated. Based on the in-situ X-ray photoelectron spectrometer (XPS) examination, measurement of band edge, and electron paramagnetic resonance (EPR) analysis, the S-scheme photocatalytic mechanism was proposed. The integration of Ti 3+ -TiO 2 and P-doped g-C 3 N 4 offers new insights into the design of advanced photocatalytic materials for sustainable energy applications.
研究领域:
材料科学
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能源化学
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环境科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Xudong Yin,Xiaojie Sun,Yufeng Mao,Ruzhen Wang,Dehao Li,Wenyu Xie,Zhenghui Liu,Zhisen Liu
The elimination of tetracycline hydrochloride (TC-HCl) from water has attracted extensive research attention. This study hydrothermally synthesized composite photocatalysts composed of BiVO 4 microspheres containing coexisting phases of monoclinic scheelite (M-BiVO 4 ) and tetragonal zircon (T-BiVO 4 ), i.e., MT-BiVO 4 , loaded onto P-doped g-C 3 N 4 nanosheets (PCNS). Furthermore, their morphology, structure, and photoelectrochemical properties were comprehensively characterized, and the performance and stability of photocatalytic degradation of TC-HCl were examined. Additionally, the effects of humic acid (HA), coexisting anions/cations, and actual water samples on the degradation efficiency of TC-HCl were investigated, and the degradation mechanism and pathways were examined. The findings indicated that the percentage of M-BiVO 4 in MT-BiVO 4 considerably influences the photocatalytic activity of the composite catalyst. Furthermore, the excellent photocatalytic performance of 5% BVO/PCNS was attributed to the synergistic effects of P-doping the modified g-C 3 N 4 , MT-BiVO 4 isotype heterojunction effects, and the Z-scheme heterojunction constructed from MT-BiVO 4 and PCNS, which can enhance the absorption range of the visible light and accelerate the transfer and separation of charge carriers between catalysts. The free radical capture experiments and electron spin resonance tests indicated that holes and O 2 - were the dominant active species in the photocatalytic degradation process. With high reusability and stability, the 5% BVO/PCNS composite has great potential for practical wastewater treatment applications. This study offers a new approach for preparing photocatalysts synergized by isotype and Z-scheme heterojunctions.
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 Materials Chemistry A
·
2020
·Vol. 8
·期 43
·22720-22727
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IF 11.301
Xueming Dang,Ruying Yang,Zhe Wang,Siyi Wu,Huimin Zhao
Graphitic carbon nitride (g-C3N4) possesses unique electronic and optical properties in the visible-light-driven production of H2O2. However, bulk g-C3N4 suffers from inefficient sunlight absorption and low carrier mobility. Herein, P doped g-C3N4 with a hollow sphere architecture was synthesized. The hollow sphere structure provides a large accessible surface area for charge transfer and enhances photo-absorption properties. Particularly, the doped P can regulate the energy band structure with stronger reducibility for O2 activation and accelerate photo-generated carrier separation. Meanwhile, the P heteroatom is beneficial to produce 1,4-endoperoxide species more easily and enhance selectivity for H2O2 synthesis through a two-electron O2 reduction process. The resultant catalyst exhibits a high H2O2 production rate of 174 μmol h−1 g−1 in pure water and 1684 μmol h−1 g−1 with isopropanol as a hole scavenger, which are 7.5 and 11.2 times those of bulk g-C3N4. This work provides a new avenue for the design and modification of other photocatalysts for H2O2 production.
研究领域:
材料科学
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光化学
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催化
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DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 30
·e01615
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IF 2
Bing Wang,Pinliang Lai,Jian Zhang,Guomin Li,Rao Fu,Hui Liu
Graphical The AgPCN+APS photocatalytic system was constructed in situ and its performance in degrading dyes in complex water environments was systematically investigated. It is of vital importance to develop highly efficient photocatalysts capable of removing dyes from actual wastewater environments. In this study, we constructed a in-situ, novel P-doped g-C 3 N 4 /Ag 3 PO 4 Z-scheme heterojunction photocatalyst (AgPCN) to degrade rhodamine B(RhB) in wastewater activated by persulfate (APS). Without the addition of persulfate, the kinetic degradation constant of RhB degraded by AgPCN can reach 0.53619 min −1 . Under the activation with a specific amount of persulfate, the kinetic degradation constant of RhB in the AgPCN + APS photocatalytic system can reach 0.78844 min −1 , which is 1.47 times higher than that of pure AgPCN. This is attributed to the structural defects of AgPCN itself and the energy level transformation caused by doping. Additionally, the activation of APS stimulates the generation of free radicals such as SO 4 · 2− , O 2 · − , and ·OH during the degradation process of AgPCN. It is worth noting that the AgPCN + APS system has a wide pH tolerance, indicating its application potential in complex actual wastewater environments. After three cycles of experiments, it still maintained a degradation efficiency of over 95%. Therefore, the AgPCN + APS system features excellent stability and wide applicability, providing a promising technical approach for the industrial treatment of dye 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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水处理技术
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产品关联
DOI
高影响因子
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