Investigation of the adsorption mechanisms of Pb(II) and 1-naphthol by beta-cyclodextrin modified graphene oxide nanosheets from aqueous solution
Investigation of the adsorption mechanisms of Pb(II) and 1-naphthol by beta-cyclodextrin modified graphene oxide nanosheets from aqueous solution
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β-环糊精改性氧化石墨烯纳米片对水溶液中 Pb(II) 和 1-萘酚的吸附机理研究
DOI：
10.1016/j.jcis.2018.06.083
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发表时间：
2018
影响因子：
9.9
通讯作者：
Chen Changlun
中科院分区：
文献类型：
--
作者：
Zheng Huiling;Zhu Kairuo;Gao Yang;Wang Qi;Wakeel M.;Wahid Abdul;Alharbi Njud S.;Chen Changlun
采用原位聚合法制备了β-环糊精修饰氧化石墨烯（β-CD-GO），并将其用于去除水环境中的无机污染物Pb（II）和有机污染物1-萘酚。研究了pH值、Pb（II）和1-萘酚初始浓度、离子强度、接触时间和温度对β-CD-GO吸附性能的影响。β-CD-GO吸附动力学研究表明，吸附以化学吸附为主，符合准二级动力学模型。在293 K时，β-CD-GO对Pb（II）和1-萘酚的最大吸附容量分别为149.56和207.6 mg·g− 1。热力学实验表明，吸附Pb（II）和1-萘酚是自发的吸热。β-CD-GO的表面络合作用、氢键作用和π-π相互作用通过其表面的羟基和羧基官能团促进了Pb（II）和1-萘酚的吸附。实验结果表明，β-CD-GO对废水中的Pb（II）和1-萘酚具有良好的去除效果。
β-cyclodextrin decorated graphene oxides (β-CD-GO) was prepared by using anin-situaggregation treatment, and used to remove inorganic (Pb(II)) and organic pollutants (1-naphthol) from water environment. The batch adsorption experiments of as-prepared β-CD-GO were carried out as a function of pH values, initial Pb(II) and 1-naphthol concentration, ionic strength, contact time and temperature. β-CD-GO kinetic results indicated that the adsorption was dominated by chemisorptions and followed a pseudo-second order model. The maximum adsorption capacities of β-CD-GO toward Pb(II) and 1-naphtholon the base of the Langmuir model were 149.56 and 207.6 mg·g−1at 293 K, respectively. The thermodynamic experiments revealed that the adsorption of Pb(II) and 1-naphthol was spontaneous and endothermic. The surface compexation, hydrogen bonds and π-π interactions contributed to Pb(II) and 1-naphthol adsorption by means of the hydroxy and carboxyl functional groups on the surface of the β-CD-GO. The experimental results indicate that the β-CD-GO is an excellent composite for the elimination of Pb(II) and 1-naphthol from wastewater.