Effective biosorption of U(VI) from aqueous solution using calcium alginate hydrogel beads grafted with amino-carbamate moieties
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Novel amino-carbamate moiety grafted calcium alginate hydrogel beads (CA-1) were synthesized by reacting sodium alginate with 4-phenylsemicarbazide followed by ionotropic crosslinking with Ca(II) ions. As compared to pure calcium alginate hydrogel beads (CA), CA-1 exhibited fast kinetics and enhanced sorption capacity towards U(VI) ions, from mild acidic conditions. The sorption kinetic could be described by pseudo-second order equation, with the chemisorption as the rate-controlling step. The sorption isotherm were fitted well by Langmuir (qm = 233.2 mg/g at 298 K). CA-1 hydrogel beads exhibited fast kinetic, high sorption capacity and excellent selectivity for U(VI) sorption, thus it could be potentially used for the removal/recovery of U(VI) ions from wastewater.
KeywordsCalcium alginate Amino-carbamate Uranium Biosorption
The work is financially supported by the National Natural Science Foundation (21667001; 21866002; 21866005; 21706028; 21866006), the Key Research and Development Program and the Natural Science Fund Program of Jiangxi Province (20161BBF60059; S2017ZRMSB0473).
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