原子能科学技术2016，Vol.50Issue(9)：1556-1564,9.DOI:10.7538/yzk.2016.50.09.1556
磁性氧化石墨烯／β-环糊精复合材料对 U（Ⅵ）的吸附性能及机理
Adsorption Characteristic and Mechanism of Uranium (Ⅵ) on Magnetism Graphene Oxide/β-cyclodextrin Composite
摘要
Abstract
The magnetism graphene oxide/β‐cyclodextrin composite (MGO/CD ) was prepared by the in‐situ coprecipitation reaction in alkaline solution .The effects of pH value ,adsorbent dosage ,contact time and initial concentration of U (Ⅵ) were investiga‐ted by static adsorption experiment .The results show that the highest adsorption capac‐ity is obtained at pH 6 .The adsorption equilibrium time is 5 h .The kinetics and equi‐librium adsorption are well described by pseudo‐second‐order kinetics and the Langmuir isotherm model , respectively . The maximum adsorption capacity for U(Ⅵ) is 322.6 mg/g at 30 ℃ .Thermodynamic study reveals that the adsorption of U (Ⅵ ) on MGO/CD is spontaneous and endothermic . SEM images show that MGO/CD has a rough surface and an uneven porous structure .FT‐IR spectra demonstrates that hydrox‐yl group ,carbonyl group and epoxide group are the main binding sites of U (Ⅵ ) in MGO/CD .Desorption experiments indicate that the adsorption rate of MGO/CD is more than 95% after being employed 4 cycles .关键词
氧化石墨烯/β-环糊精/铀(Ⅵ)/吸附Key words
graphene oxide/β-cyclodextrin/uranium(Ⅵ)/adsorption分类
化学化工引用本文复制引用
史冬峰,唐振平,黄华勇,曾涛涛,谢水波..磁性氧化石墨烯／β-环糊精复合材料对 U（Ⅵ）的吸附性能及机理[J].原子能科学技术,2016,50(9):1556-1564,9.基金项目
国家自然科学基金资助项目（11175081，11475080）；高等学校博士点基金资助项目（20134324110003）；湖南省教育厅优秀青年项目资助 （）
