Correlation between the adsorption ability and reduction degree of graphene oxide and tuning of adsorption of phenolic compounds |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074, PR China;3. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, PR China;1. Department of Environmental Science, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India;2. Department of Chemical Engineering, Jadavpur University, 188, Raja S.C. Mullick Road, Kolkata 700 032, India;1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada;2. Future Industries Institute, University of South Australia, SA 5095, Australia;1. State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, People’s Republic of China;2. Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, People’s Republic of China;3. Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, People’s Republic of China;4. Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, People’s Republic of China;1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;2. Beijing Key Laboratory of Membrane Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | Graphene oxide (GO) was prepared with a modified Hummers method and then reduced to different reduction degrees by using hydrazinehydrate. The obtained GO and reduced GO (RGO) were characterized. It was found that the reduction removed most of the oxygen-containing functional groups on the surface of GO. By using naphthalene as a probe, the interaction between RGO and organic molecules was evaluated with NMR. It was confirmed that the reduction of GO increased significantly the interaction between the π system of graphene and the π unit of organic molecules. The thermodynamic analysis indicated that the adsorption was a spontaneous, exothermic and entropy-decreasing process. It was observed that the adsorption capacities were generally increased with increasing the reduction degree of GO. The chemical structures of phenolics also affected their adsorption on RGO. The adsorption of the phenolics on RGO was enhanced by introducing electron-donating and withdrawing functional groups on the benzene ring. Depending on the chemical structures of phenolics, the surface reduction of GO to RGO-1 significantly increased the adsorption capacity for phenolics by a factor as large as 235%. A possible adsorption mechanism and correlation between the adsorption ability, reduction degree of GO and chemical structures of phenolics was discussed. |
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