期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 49, 期 15, 页码 9168-9175出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b02022
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资金
- National Natural Science Foundation of China [21207135, 21225730, 91326202, 91126020]
- 973 projects from MOST of China [2011CB933700]
- Scientific Research Grant of Hefei Science Center of CAS [2015SRG-HSC009, 2015SRG-HSC006]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions
- MCTL Visiting Fellowship Program of Ocean University of China
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 pseudosecond-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 pi-pi stacking and flexible long alkyl chain of 4-n-NP, whereas adsorption of EPA on rGOs was energetically favored by a lying-down configuration due to pi-pi 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.
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