期刊论文

Xie, Shui-Bo(xiesbmr@263.net)

中文

原子能科学技术

1000-6931

2016

50

9

1556-1564

10.7538/yzk.2016.50.09.1556

11175081:国家自然科学基金 11475080:国家自然科学基金 20134324110003:高等学校博士学科点专项科研基金 14B154:湖南省教育厅优秀青年项目

本校为第一且通讯机构

采用原位共沉淀法制备了磁性氧化石墨烯/β-环糊精(MGO/CD)复合材料。通过静态吸附实验,考察了pH值、MGO/CD用量、反应时间以及U(Ⅵ)初始浓度等因素对MGO/CD吸附U(Ⅵ)效果的影响。结果表明,最佳pH=6,吸附平衡时间为5h。吸附过程符合准二级动力学模型和Langmuir等温吸附方程,30℃时最大吸附容量为322.6mg/g。MGO/CD吸附U(Ⅵ)是自发的吸热反应。SEM、FT-IR和XRD分析结果表明,MGO/CD表面粗糙,凹凸不平,羟基、羰基和环氧基是U(Ⅵ)的主要结合位点。解吸实验结果表明,经4次吸附解吸循环实验后,MGO/CD的吸附率仍大于95%。

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 investigated by static adsorption experiment. The results show that the highest adsorption capacity is obtained at pH 6. The adsorption equilibrium time is 5 h. The kinetics and equilibrium adsorption are well described by pseudo-second-order kinetics and the Langmuir isotherm model, respectively. The maximum adso...