中文摘要：

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。

英文摘要：

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）.