title: Facile preparation of NiCo2O4@rGO composites for the removal of uranium ions from aqueous solutions.
abstract: A hierarchical structure of NiCo2O4@rGO composite has been fabricated, with its structure and morphology well characterized by XRD, TEM, XPS and BET. The results proved that the NiCo2O4nanosheets grow uniformly on both sides of the graphene sheets. In batch adsorption experiments, the effects of equilibrium time, pH and temperature on uranium(vi) adsorption were investigated. The main results show that the NiCo2O4@rGO composite has a higher affinity towards the uptake of uranium(vi) from aqueous solutions. The highest adsorption capacity reached 342.4 mg U g-1at pH 5.0. Kinetic analysis shows that the adsorption process is described best by a pseudo-second-order kinetic model. The uranium(vi) sorption equilibrium data correlates well with the Langmuir sorption isotherm model in the thermodynamic analysis. Thus, NiCo2O4@rGO composite is an excellent adsorbent for removing uranium(vi) ions.
authors.affiliation: Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China. tanlcking@163.com.
authors.forename: Xiumei
authors.initials: X
authors.lastname: Song
authors.forename: Lichao
authors.initials: L
authors.lastname: Tan
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Sun
authors.forename: Huiyuan
authors.initials: H
authors.lastname: Ma
authors.forename: Lin
authors.initials: L
authors.lastname: Zhu
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Yi
authors.forename: Qiang
authors.initials: Q
authors.lastname: Dong
authors.forename: Junyu
authors.initials: J
authors.lastname: Gao