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

作者：Zhang Wen Long; Zhang Zhi Bin; Cao Xiao Hong; Ma Ru Chao; Liu Yun Hai^*

来源：Journal of Radioanalytical and Nuclear Chemistry, 2014, 301(1): 197-205.

DOI：10.1007/s10967-014-3128-8

• Chitosan
• Hydrothermal carbonization
• Adsorption
• Uranium
• Central composite design

A new hydrothermal cross-linking chitosan (HCC) was prepared by hydrothermal reaction at a mild temperature (180 A degrees 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, a dagger GA degrees(298 K), a dagger HA degrees and a dagger SA degrees, demonstrated shown that the sorption process of U(VI) onto HCC was feasible, spontaneous and endothermic in nature.

• 出版日期2014-7
• 单位东华理工大学