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- Title
Adsorptive removal of U(VI) from aqueous solution by hydrothermal carbon spheres with phosphate group.
- Authors
Yu, Xiao-Feng; Liu, Yun-Hai; Zhou, Zhi-Wei; Xiong, Guo-Xuan; Cao, Xiao-Hong; Li, Min; Zhang, Zhi-Bin
- Abstract
The phosphorylated hydrothermal carbon spheres (HCS-PO) were developed by functionalizing hydrothermal carbon spheres (HCS) with o-phosphoethanolamine, and the structure and textural property were characterized by SEM and FT-IR. The parameters that affect the uranium(VI) sorption, such as solution pH, initial U(VI) concentration, contact time, and temperature, had been investigated. The HCS-PO showed the highest uranium sorption capacity at initial pH 6.0 and contact time of 120 min. The adsorption kinetics was better described by the pseudo-second-order model, and the adsorption process could be well defined by the Langmuir isotherm and the maximum monolayer adsorption capacity increased from 80.00 to 434.78 mg/g after phosphorylation. The thermodynamic parameters, ∆ G° (298 K), ∆ H° and ∆ S°, demonstrated shown that the sorption process of U(VI) onto HCS-PO was feasible, spontaneous and endothermic in nature. The spent HCS-PO could be effectively regenerated by 0.1 mol/L EDTA solution for the removal and recovery of U(VI) and reused for ten cycles at least. Selective adsorption studies showed that the HCS-PO could selectively remove U(VI), and the selectivity coefficients of HCS in the presence of co-existing ions, Mg(II), Na(I), Zn(II), Mn(II),Co(II), Ni(II), Sr(II), Cs(I) and Hg(II) improved after functionalization.
- Subjects
URANIUM removal (Groundwater purification); PHOSPHORYLATION; HYDROTHERMAL carbonization; AQUEOUS solutions; PHOSPHATES; LANGMUIR isotherms; ADSORPTION (Chemistry)
- Publication
Journal of Radioanalytical & Nuclear Chemistry, 2014, Vol 300, Issue 3, p1235
- ISSN
0236-5731
- Publication type
Article
- DOI
10.1007/s10967-014-3081-6