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One-pot preparation of graphene oxide magnetic nanocomposites for the removal of tetrabromobisphenol A |
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| Authors: | Liqin Ji Xue Bai Lincheng Zhou Hanchang Shi Wei Chen Zulin Hua |
| Institution: | 1. School of Environment, Tsinghua University, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Beijing, 100084, China 2. State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, Lanzhou, 730000, China 3. College of Environmental Science and Engineering, Hohai University, Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake (Ministry of Education), Nanjing, 210098, China |
| Abstract: | A simple solvothermal method was used to prepare monodisperse magnetite (Fe3O4) nanoparticles attached onto graphene oxide (GO) sheets as adsorbents to remove tetrabromobisphenol A (TBBPA) from an aqueous solution. These Fe3O4/GO (MGO) nanocomposites were characterized by transmission electron microscopy. The adsorption capacity at different initial pH, contact duration, and temperature were evaluated. The kinetics of adsorption was found to fit the pseudo-second-order model perfectly. The adsorption isotherm well fitted the Langmuir model, and the theoretical maximum of adsorption capacity calculated by the Langmuir model was 27.26 mg·g?1. The adsorption thermodynamics of TBBPA on the MGO nanocomposites was determined at 303 K, 313 K, and 323 K, respectively. The results indicated that the adsorption was spontaneous and endothermic. The MGO nanocomposites were conveniently separated from the media by an external magnetic field within several seconds, and then regenerated in 0.2M NaOH solution. Thus, the MGO nanocomposites are a promising candidate for TBBPA removal from wastewater. |
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