title: Adsorption of 4-n-Nonylphenol and Bisphenol-A on Magnetic Reduced Graphene Oxides: A Combined Experimental and Theoretical Studies.
abstract: Adsorption of 4-n-nonylphenol (4-n-NP) and bisphenol A (BPA) on magnetic reduced graphene oxides (rGOs) as a function of contact time, pH, ionic strength and humic acid were investigated by batch techniques. Adsorption of 4-n-NP and BPA were independent of pH at 3.0- 8.0, whereas the slightly decreased adsorption was observed at pH 8.0-11.0. Adsorption kinetics and isotherms of 4-n-NP and BPA on magnetic rGOs can be satisfactorily fitted by pseudo-second-order kinetic and Freundlich model, respectively. The maximum adsorption capacities of magnetic rGOs at pH 6.5 and 293 K were 63.96 and 48.74 mg/g for 4-n-NP and BPA, respectively, which were significantly higher than that of activated carbon. Based on theoretical calculations, the higher adsorption energy of rGOs + 4-n-NP was mainly due to π-π stacking and flexible long alkyl chain of 4-n-NP, whereas adsorption of BPA on rGOs was energetically favored by a lying-down configuration due to π-π stacking and dispersion forces, which was further demonstrated by FTIR analysis. These findings indicate that magnetic rGOs is a promising adsorbent for the efficient elimination of 4-n-NP/BPA from aqueous solutions due to its excellent adsorption performance and simple magnetic separation, which are of great significance for the remediation of endocrine-disrupting chemicals in environmental cleanup.
authors.affiliation: †School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, P. R. China.|‡Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei, 230031, P.R. China.|§University of Science and Technology of China, Hefei, 230032, P.R. China.
authors.forename: Zhongxiu
authors.initials: Z
authors.lastname: Jin
authors.affiliation: ‡Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei, 230031, P.R. China.|§University of Science and Technology of China, Hefei, 230032, P.R. China.
authors.forename: Xiangxue
authors.initials: X
authors.lastname: Wang
authors.affiliation: ‡Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Science, P.O. Box 1126, Hefei, 230031, P.R. China.
authors.forename: Yubing
authors.initials: Y
authors.lastname: Sun
authors.affiliation: †School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, P. R. China.
authors.forename: Yuejie
authors.initials: Y
authors.lastname: Ai
authors.affiliation: †School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, P. R. China.|∥Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences, Soochow University, 215123, Suzhou, P.R. China.|⊥NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
authors.forename: Xiangke
authors.initials: X
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D001559:Benzhydryl Compounds / Q000737:chemistry / Q000302:isolation & purification*; D006108:Graphite / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008280:Magnetics; D008962:Models, Theoretical; D008968:Molecular Conformation; D009994:Osmolar Concentration; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification*; D011789:Quantum Theory; D059027:Recycling; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D006108:Graphite; D006812:Humic Substances; D010087:Oxides; D010636:Phenols; C041594:4-nonylphenol; C006780:bisphenol A; D000098826:Bisphenol A Compounds