Adsorption of 4-n-Nonylphenol and Bisphenol-A on Magnetic Reduced Graphene Oxides: A.Combined Experimental and Theoretical Studies
Adsorption of 4-n-Nonylphenol and Bisphenol-A on Magnetic Reduced Graphene Oxides: A.Combined Experimental and Theoretical Studies
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磁还原氧化石墨烯对 4-n-壬基酚和双酚 A 的吸附：A.实验与理论相结合的研究
DOI：
10.1021/acs.est.5b02022
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发表时间：
2015-08-04
影响因子：
11.4
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
--
作者：
Jin, Zhongxiu;Wang, Xiangxue;Wang, Xiangke
采用间歇吸附法研究了磁性还原氧化石墨烯（rP-R）对4-n-壬基酚（4-n-NP）和双酚A（BPA）的吸附行为及其与吸附时间、pH、离子强度和腐殖酸的关系。4-n-NP和BPA的吸附在pH 3.0- 8.0范围内不受pH的影响，而在pH 8.0-11.0范围内吸附量略有下降。磁性吸附剂对4-n-NP和BPA的吸附动力学和吸附等温线分别可用准二级动力学和Freundlich模型拟合。在pH6.5和293 K下，磁性吸附剂对4-n-NP和BPA的最大吸附量分别为63.96和48.74mg/g，明显高于活性炭。理论计算表明，rP 4 + 4-n-NP的高吸附能主要是由于pi-pi堆积和4-n-NP的柔性长烷基链，而EPA在rP 4上的吸附主要是由pi-pi堆积和分散力引起的平躺构型，FTIR分析进一步证实了这一点。这些结果表明，磁性吸附剂具有优良的吸附性能和简单的磁分离操作，是一种很有前途的去除水溶液中4-n-NP/BPA的吸附剂，对环境污染物的修复具有重要意义。
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.