title: Preparation and characterization of porous reduced graphene oxide based inverse spinel nickel ferrite nanocomposite for adsorption removal of radionuclides.
abstract: For the removal of uranium(VI) (U(VI)) and thorium(IV) (Th(IV)), graphene oxide based inverse spinel nickel ferrite (GONF) nanocomposite and reduced graphene oxide based inverse spinel nickel ferrite (rGONF) nanocomposite were prepared by co-precipitation of GO with nickel and iron salts in one pot. The spectral characterization analyses revealed that GONF and rGONF have a porous surface morphology with an average particle size of 41.41nm and 32.16nm, respectively. The magnetic property measurement system (MPMS) studies confirmed the formation of ferromagnetic GONF and superparamagnetic rGONF. The adsorption kinetics studies found that the pseudo-second-order kinetics was well tune to the U(VI) and Th(IV) adsorption. The results of adsorption isotherms showed that the adsorption of U(VI) and Th(IV) were due to the monolayer on homogeneous surface of the GONF and rGONF. The adsorptions of both U(VI) and Th(IV) were increased with increasing system temperature from 293 to 333±2K. The thermodynamic studies reveal that the U(VI) and Th(IV) adsorption onto GONF and rGONF was endothermic. GONF and rGONF, which could be separated by external magnetic field, were recycled and re-used for up to five cycles without any significant loss of adsorption capacity.
authors.affiliation: Department of Environmental Engineering, Kwangwoon University, Seoul, 139-701, Republic of Korea.
authors.forename: Lakshmi Prasanna
authors.initials: LP
authors.lastname: Lingamdinne
authors.affiliation: Department of Environmental Engineering, Kwangwoon University, Seoul, 139-701, Republic of Korea.
authors.forename: Yu-Lim
authors.initials: YL
authors.lastname: Choi
authors.affiliation: Graduate School of Environmental Studies, Kwangwoon University, Seoul, 139-701, Republic of Korea.
authors.forename: Im-Soon
authors.initials: IS
authors.lastname: Kim
authors.affiliation: Ingenium College of Liberal Arts, Kwangwoon University, Seoul, 139-701, Republic of Korea.
authors.forename: Jae-Kyu
authors.initials: JK
authors.lastname: Yang
authors.affiliation: Graduate School of Environmental Studies, Kwangwoon University, Seoul, 139-701, Republic of Korea. Electronic address: reddyjchem@gmail.com.
authors.forename: Janardhan Reddy
authors.initials: JR
authors.lastname: Koduru
authors.affiliation: Department of Environmental Engineering, Kwangwoon University, Seoul, 139-701, Republic of Korea. Electronic address: yychang@kw.ac.kr.
authors.forename: Yoon-Young
authors.initials: YY
authors.lastname: Chang
keywords: Adsorption; Graphene oxide; Graphene oxide-based nickel ferrite; Thorium(IV); Uranium(VI); XPS studies