Investigation of the adsorption mechanisms of Pb(II) and 1-naphthol by β-cyclodextrin modified graphene oxide nanosheets from aqueous solution

Huiling Zheng; Yang Gao; Kairuo Zhu; Qi Wang; M Wakeel; Abdul Wahid; Njud S Alharbi; Changlun Chen

doi:10.1016/j.jcis.2018.06.083

Investigation of the adsorption mechanisms of Pb(II) and 1-naphthol by β-cyclodextrin modified graphene oxide nanosheets from aqueous solution

J Colloid Interface Sci. 2018 Nov 15:530:154-162. doi: 10.1016/j.jcis.2018.06.083. Epub 2018 Jun 27.

Authors

Huiling Zheng¹, Yang Gao¹, Kairuo Zhu², Qi Wang³, M Wakeel⁴, Abdul Wahid⁴, Njud S Alharbi⁵, Changlun Chen⁶

Affiliations

¹ CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, Anhui, PR China; University of Science and Technology of China, Hefei 230026, Anhui, PR China.
² CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, Anhui, PR China.
³ CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, Anhui, PR China. Electronic address: qiwang@ipp.ac.cn.
⁴ Department of Environment Sciences, Bahauddin Zakariya University, Multan 60800, Pakistan.
⁵ Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
⁶ CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, Anhui, PR China; Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia. Electronic address: clchen@ipp.ac.cn.

PMID: 29966848
DOI: 10.1016/j.jcis.2018.06.083

Abstract

β-cyclodextrin decorated graphene oxides (β-CD-GO) was prepared by using an in-situ aggregation 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^-1 at 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.

Keywords: 1-naphthol; Adsorption; Graphene oxide; Pb(II); β-cyclodextrin.