Enhanced photocatalytic hydrogen production of CdS embedded in cationic hydrogel |
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| Affiliation: | 1. Department of Applied Chemistry, School of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin, 300134, PR China;2. Department of Chemistry, Tianjin University, Tianjin, 300072, PR China;3. Key Laboratory of Sichuan Province for Metal Fuel Cell, DeYang, 618029, Sichuan, PR China;1. State Key Laboratory of Crystal Materials, Shandong University, 27 Shandanan Road, Jinan, Shandong, 250100, China;2. School of Environment and Energy, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, Guangdong, 510006, China;1. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, PR China;2. Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, PR China;3. Aviation Fuels Research Laboratory, Federal Aviation Administration William J. Hughes Technical Center, Atlantic City International Airport, NJ, USA;4. Shanghai Institute of Pollution Control and Ecological Security, Shanghai, PR China |
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| Abstract: | In this study, we describe the successful fabrication of CdS in ionic hydrogels by an in situ growth method and demonstrate that the as-prepared CdS in hydrogels (CdS/HGel) can be used as cost-effective and recyclable catalysts for photocatalytic hydrogen generation. The structure and morphology of CdS/HGels were characterized by various techniques including X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, and Fourier transform infrared spectroscopy. The resultant CdS in cationic hydrogel (CdS/HGelPDAM2) showed the best performance of photocatalytic hydrogen production and the hydrogen production rate was up to 10.35 or 7.70 mmol h?1 g?1 when triethanolamine or Na2S–Na2SO3 was used as sacrificial agent. However, CdS in anionic hydrogel (CdS/HGelPAAM) showed poor photocatalytic hydrogen production performance under the same conditions. The solution pH and sacrificial agent type are also indispensable factors that affect the photocatalytic hydrogen production. The enhancement of hydrogen production comes from interaction between polymer chains and Cd2+, high dispersibility of CaS nanoparticles in hydrogels, high hydrophilic and swelling ability of hydrogel, high diffusion rate of reactant in hydrogel, and inhibited binding possibility of photogenerated electron-hole pairs. Since CdS/HGelPDAM has excellent hydrogen production efficiency and ease recovery property, it will be a potential photocatalyst for photocatalytic reactions. |
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| Keywords: | CdS Photocatalytic hydrogen production Cationic hydrogel Anionic hydrogel Sacrificial agent |
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