化工学报2013，Vol.64Issue(7)：2488-2496,9.DOI:10.3969/j.issn.0438-1157.2013.07.025
交联海藻酸钠固定化的腐殖酸多孔性薄膜对铀(Ⅵ)的吸附性能及机理
Characteristics and mechanism of uranium (Ⅵ) adsorption on glutaraldehyde crosslinked humic acid-immobilized sodium alginate porous membrane
摘要
Abstract
Glutaraldehyde crosslinked humic acid-immobilized sodium alginate was used to develop a novel porous composite membrane adsorbent (GA-HA/SA) for the removal of uranium (Ⅵ) ions from uranium-contained wastewater.The physicochemical properties of GA-HA/SA before and after adsorption were investigated by FTIR,SEM and EDX methods.To investigate the effects of experimental parameters on adsorption behavior,batch experiments were performed by changing solution pH,initial concentration of U (Ⅵ) ions,contact time and temperature.The experimental data fit the Langmuir and DubininRadushkevich (D-R) isotherm models well.The adsorption process can be described by pseudo-secondorder kinetic model and the correlation coefficient is more than 0.99.The adsorption rate is controlled mainly by intra-particle diffusion.The calculated thermodynamic parameters such as Gibbs free energy change,enthalpy change and entropy change indicate that the adsorption of U(Ⅵ) onto GA-HA/SA is feasible,spontaneous and endothermic in nature.FTIR and mean free energy of adsorption for D-R isotherm show that the adsorption of U(Ⅵ) ions onto GA-HA/SA involves an ion exchange process.关键词
多孔性薄膜/铀(Ⅵ)/热力学/动力学/速率控制/吸附机理Key words
porous composite membrane/ uranium (Ⅵ)/ thermodynamics/ kinetics/ rate control/ adsorption mechanism分类
化学化工引用本文复制引用
谢水波,段毅,刘迎九,王劲松,刘金香..交联海藻酸钠固定化的腐殖酸多孔性薄膜对铀(Ⅵ)的吸附性能及机理[J].化工学报,2013,64(7):2488-2496,9.基金项目
国家自然科学基金项目(11175081,21177053) （11175081,21177053）
湖南省科技计划重点项目(2011SK2015) （2011SK2015）
supported by the National Natural Science Foundation of China (11175081,21177053) and the Science and Technology Project of Hunan Province (2011SK2015). （11175081,21177053）
