title: Preparation of graphene oxide-manganese dioxide for highly efficient adsorption and separation of Th(IV)/U(VI).
abstract: Manganese dioxide decorated graphene oxide (GOM) was prepared via fixation of crystallographic MnO2 (α, γ) on the surface of graphene oxide (GO) and was explored as an adsorbent material for simultaneous removal of thorium/uranium ions from aqueous solutions. In single component systems (Th(IV) or U(VI)), the α-GOM2 (the weight ratio of GO/α-MnO2 of 2) exhibited higher maximum adsorption capacities toward both Th(IV) (497.5mg/g) and U(VI) (185.2 mg/g) than those of GO. In the binary component system (Th(IV)/U(VI)), the saturated adsorption capacity of Th(IV) (408.8 mg/g)/U(VI) (66.8 mg/g) on α-GOM2 was also higher than those on GO. Based on the analysis of various data, it was proposed that the adsorption process may involve four types of molecular interactions including coordination, electrostatic interaction, cation-pi interaction, and Lewis acid-base interaction between Th(IV)/U(VI) and α-GOM2. Finally, the Th(IV)/U(VI) ions on α-GOM2 can be separated by a two-stage desorption process with Na2CO3/EDTA. Those results displayed that the α-GOM2 may be utilized as an potential adsorbent for removing and separating Th(IV)/U(VI) ions from aqueous solutions.
authors.affiliation: College of Chemistry, Sichuan University, Chengdu 610064, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Pan
authors.affiliation: College of Chemistry, Sichuan University, Chengdu 610064, China.
authors.forename: Long
authors.initials: L
authors.lastname: Li
authors.affiliation: College of Chemistry, Sichuan University, Chengdu 610064, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Taipa, Macau SAR, China.
authors.forename: Shengke
authors.initials: S
authors.lastname: Li
authors.affiliation: State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Taipa, Macau SAR, China. Electronic address: rwang@umac.mo.
authors.forename: Ruibing
authors.initials: R
authors.lastname: Wang
authors.affiliation: College of Chemistry, Sichuan University, Chengdu 610064, China. Electronic address: jinyongdong@scu.edu.cn.
authors.forename: Yongdong
authors.initials: Y
authors.lastname: Jin
authors.affiliation: School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, China.
authors.forename: Xiangke
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Chemistry, Sichuan University, Chengdu 610064, China; Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China. Electronic address: xiachqin@163.com.
authors.forename: Chuanqin
authors.initials: C
authors.lastname: Xia
mesh_terms: D000327:Adsorption; D006108:Graphite / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D013910:Thorium / Q000737:chemistry*; D014501:Uranium / Q000737:chemistry*; D014875:Water Pollutants, Radioactive / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D017895:Manganese Compounds; D010087:Oxides; D014875:Water Pollutants, Radioactive; D014501:Uranium; D013910:Thorium; D006108:Graphite; C016552:manganese dioxide
keywords: Graphene oxide; Manganese dioxide; Selective desorption; Simultaneous adsorption; Uranium/Thorium