Adsorption characteristics of 1,2,4-trichlorobenzene, 2,4,6-trichlorophenol, 2-naphthol and naphthalene on graphene and graphene oxide |
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| Affiliation: | 1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco–Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China;2. Supervision and Testing Center for Vegetable Quality, Ministry of Agriculture, The Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China;3. College of Chemistry and Materials Science, Ludong University, Yantai 264025, China;1. Qianjiang College, Hangzhou Normal University, Hangzhou 310036, China;2. MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China;1. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;2. Southern Cross GeoScience, Southern Cross University, Lismore, NSW 2480, Australia;1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, PR China;2. Zhejiang Fuchunjiang Environmental Technology Research Co., Ltd., Hangzhou, 311401, PR China;3. College of Health Sciences, Kentucky Christian University, Grayson, KY, 41143, United States;1. Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500, China;2. Yunnan Key Lab of Soil Carbon Sequestration and Pollution Control, Kunming, 650500, China;3. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China;4. Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, United States |
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| Abstract: | Adsorption of 1,2,4-trichlorobenzene (TCB), 2,4,6-trichlorophenol (TCP), 2-naphthol and naphthalene (NAPH) on graphene (G) and graphene oxide (GO) was investigated using a batch equilibration method and micro-Fourier transform infrared spectroscopy. All adsorption isotherms of four aromatics on G and GO were nonlinear, indicating that except for hydrophobic interaction, some specific interactions were involved in adsorption. For G, four aromatics had similar adsorption capacity at pH 5.0 in despite of their different chemical properties. A series of pH-dependent experimental results showed that 2-naphthol had higher adsorption capacity on G at alkaline pH than that at acidic pH. Theoretical calculation ascribed this to higher π-electron density of anionic 2-naphthol than that of neutral 2-naphthol, which facilitated the π–π interaction formation with G. For GO, the adsorption affinity of four aromatics increased in the order: NAPH < TCB < TCP < 2-naphthol. FTIR results revealed that TCB, TCP and 2-naphthol were adsorbed on G mainly via π–π interaction. In contrast, high adsorption of TCP and 2-naphthol on GO was attributed to the formation of H-bonding between hydroxyl groups of TCP and 2-naphthol and O-containing functional groups on GO. |
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