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

Author:
Zheng, Huiling, Gao, Yang, Zhu, Kairuo, Wang, Qi, Wakeel, M., Wahid, Abdul, Alharbi, Njud S., Chen, Changlun
Source:
Journal of colloid and interface science 2018 v.530 pp. 154-162
ISSN:
0021-9797
Subject:
1-naphthol, adsorption, aqueous solutions, beta-cyclodextrin, endothermy, graphene oxide, hydrogen bonding, ionic strength, lead, models, moieties, nanosheets, pH, pollutants, sorption isotherms, temperature, thermodynamics, wastewater
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.
Agid:
6017881