Uranium adsorption studies on hydrothermal carbon produced by chitosan using statistical design method

• Published in: Journal of radioanalytical and nuclear chemistry 2014-07, Vol.301 (1), p.197-205
• Main Authors: Zhang, Wen-Long, Zhang, Zhi-Bin, Cao, Xiao-Hong, Ma, Ru-Chao, Liu, Yun-Hai
• Format: Article
• Language: English
• Subjects: Adsorption; Amines; Analysis; Chemical properties; Chemistry; Chemistry and Materials Science; Diagnostic Radiology; Hadrons; Heavy Ions; Inorganic Chemistry; Methods; Nuclear Chemistry; Nuclear Physics; Physical Chemistry; Uranium
• ISSN: 0236-5731; 1588-2780
• DOI: 10.1007/s10967-014-3128-8

A new hydrothermal cross-linking chitosan (HCC) was prepared by hydrothermal reaction at a mild temperature (180 °C) to diminish the solubility in acid solution, and the amine groups were almost retained during the hydrothermal reaction characterized by FT-IR and the dissolution rate in pH 3 solution decreased from 89.6 to 12.6 %. The effects of initial pH, contact time, initial concentration and temperature on the sorption capacity are discussed using 24 full-factorial central composite design using response-surface methodology. The HCC showed the highest uranium sorption capacity at initial pH of 7.92 and contact time of 273.6 min with 24 full-factorial central composite design and the maximum adsorption capacity was 273 mg/g. The adsorption process could be well defined by the Langmuir isotherm and the thermodynamic parameters, ∆ G °(298 K), ∆ H ° and ∆ S °, demonstrated shown that the sorption process of U(VI) onto HCC was feasible, spontaneous and endothermic in nature.