三聚磷酸钠交联壳聚糖/纳米Fe^0复合膜对U(Ⅵ)的吸附特性  

Adsorption Property of U(Ⅵ) on Tripolyphosphate-crosslinking Chitosan/Nano-Fe^0 Composite Membrane

作　　者：黎钊 金解云[2] 王云[2] 曾凯[1] 邹洪斌[2] 周利民[1,2] 

机构地区：[1]东华理工大学江西省聚合物微纳制造与器件重点实验室,江西南昌330013 [2]东华理工大学核资源与环境国家重点实验室培育基地,江西南昌330013

出　　处：《原子能科学技术》2017年第9期1564-1570,共7页Atomic Energy Science and Technology

基　　金：长江学者和创新团队发展计划资助项目(IRT13054);江西省科技厅科技项目资助(20161BBF60059;S2017ZRMSB0473);江西省教育厅科技项目资助(GJJ161583)

摘　　要：制备了三聚磷酸钠交联壳聚糖/纳米Fe^0(CS-Fe)复合膜,并将其用于吸附U(Ⅵ),考察了pH值对CS-Fe复合膜吸附U(Ⅵ)的影响,以及吸附动力学和吸附等温线。结果表明,吸附等温线符合双位点Langmuir模型,以CS-Fe复合膜的磷酸基团为主要吸附位,纳米Fe^0为次要吸附位。吸附动力学符合准二级模型,表明化学吸附是控速步骤。CS-Fe复合膜对U(Ⅵ)的饱和吸附容量(208.8mg/g)远高于壳聚糖膜对U(Ⅵ)的饱和吸附容量(131.6mg/g),这是由于壳聚糖促进了纳米Fe^0的分散以及纳米Fe^0还原U(Ⅵ)的共同作用。The tripolyphosphate-crosslinking chitosan/nano-Fe^0（CS-Fe）composite membrane was prepared for U（Ⅵ）adsorption.The effect of pH on the adsorption of U（Ⅵ）onto CS-Fe,adsorption kinetics and adsorption isotherms were investigated.The results indicate that the adsorption isotherms fit well with the bi-site Langmuir model,with the phosphate groups from CS-Fe as the main sorption sites and nano-Fe^0（FeNPs）as the secondary active sites.The adsorption kinetics follows pseudo second-order model,indicating chemisorption as the rate-controlling step.The enhanced adsorption ofU（Ⅵ）for CS-Fe（q_（m,cal）=208.8 mg/g against q_（m,cal）=131.6 mg/g for CS）is attributed to the dispersion of FeNPs in chitosan matrix and the redox reaction between the well-dispersed FeNPs and U（Ⅵ）.

关 键 词：CS-Fe复合膜 U(Ⅵ) 吸附动力学 吸附等温线 

分 类 号：TQ424[化学工程]