ZnIn2S4/In(OH)3 hollow microspheres fabricated by one-step l-cysteine-mediated hydrothermal growth for enhanced hydrogen production and MB degradation |
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| Affiliation: | 1. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, School of Environmental Science and Engineering, Chang’an University, Xi’an 710064, PR China;2. School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu 212013, PR China;1. School of Electrical and Energy Power Engineering, Yangzhou University, Yangzhou 225002, China;2. Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, Shanghai 200240, China;3. Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg, Germany;4. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China;1. School of Environmental and Municipal Engineering, Xi''an University of Architecture and Technology, Xi''an 710055, China;2. Key Laboratory of Membrane Separation of Shaanxi Province, Xi''an 710055, China;3. School of Building Services Science and Engineering, Xi''an University of Architecture and Technology, Xi''an 710055, China;4. Institute of Mechanics and Technology, Xi''an University of Architecture and Technology, Xi''an 710055, China;1. Jiangsu Collaborative Innovation Center for Rock Salt and Concave Soil Resources Deep Utilization, Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Huaiyin Institute of Technology, Huaian, 223003, PR China;2. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China;3. Hunan Key Laboratory of Mineral Materials and Application, Central South University, Changsha, 410083, PR China |
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| Abstract: | An intervening barrier for photocatalytic water decomposition and pollutant degradation is the frustratingly quick recombination of e− - h+ pairs. Delicate design of heterojunction photocatalysts by coupling the semiconductors at nanoscale with well-matched geometrical and electronic alignments is an effective strategy to ameliorate the charge separation. Here a facile and environment-friendly l-cysteine-assisted hydrothermal process under weakly alkaline conditions is demonstrated for the first time to fabricate ZnIn2S4/In(OH)3 hollow microspheres with intimate contact, which are verified by XRD, SEM, (HR)TEM, XPS, N2 adsorption-desorption, UV–Vis DRS and photoluminescence spectra. ZnIn2S4/In(OH)3 heterostructure (L-cys/Zn2+ = 4, molar ratio) with a band-gap of 2.50 eV, demonstrates the best photocatalytic performance for water reduction and MB degradation under visible light, outperforming its counterparts (In(OH)3 and ZnIn2S4). The excellent activity of ZnIn2S4/In(OH)3 heterostructure arises from the intercrossed band-edge positions as well as the unique hollow structure with large surface area and wide pore-size distribution, which are beneficial for the efficient charge migration from bulk to surface as well as at the interface between ZnIn2S4 and In(OH)3. This work provides an efficient and eco-friendly strategy for one-pot synthesis of heterostructured composites with intimate contact for photocatalytic application. |
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| Keywords: | Hollow microsphere Green synthesis Charge separation Photocatalysis |
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