期刊论文

Preparation of magnetic yolk/shell CoFe_2O_4@SiO_2@PIL-AO composite material and its adsorption behavior for U(VI)

Ding, D.

中文

环境科学学报

0253-2468

2018

38

9

3605-3613

10.13671/j.hjkxxb.2018.0097

Supported by the National Natural Science Foundation of China(No.U1401231),the Scientific Research Fund of Hunan Provincial Education Department(No.16C1386) and the USC Innovation Foundation for Postgraduate(No.2017XCX08)

本校为第一且通讯机构

通过化学合成法制备了磁性核壳CoFe_2O_4@SiO_2@PIL-AO复合材料,采用傅立叶变换红外光谱(FTIR)、扫描电镜(SEM)和X射线光电子能谱(XPS)对其进行了表征,研究了溶液pH、吸附时间、U(VI)初始浓度和温度等参数对U(VI)吸附性能的影响.实验结果表明:在c0 = 0.2 mg·L~(-1)、pH= 6.00±0.05、T = 298.15 K、m= 0.02 g和t = 8 h的条件下,CoFe_2O_4@SiO_2@PIL-AO对U(VI)的吸附作用最强,吸附率达到了97.54%;CoFe_2O_4@SiO_2@PIL-AO吸附U(VI)是一个自发进行的吸热反应,U(VI)吸附动力学符合准二级动力学模型,吸附等温线符合Freundlich模型;CoFe_2O_4@SiO_2@PIL-AO复合材料具有良好的可循环使用性,循环使用5次...

The magnetic yolk/shell CoFe 2 O 4 @SiO 2 @PIL-AO composite material was prepared by chemical synthesis and was characterized with FTIR, SEM and XPS. The adsorption of U(VI) on CoFe 2 O 4 @SiO 2 @PIL-AO as a function of solution pH, adsorption time, initial U(VI) concentration and temperature was investigated. The experimental results show that the CoFe 2 O 4 @SiO 2 @PIL-AO has strong adsorption capacity for U(VI), with the adsorption rate reaching the highest value of 97.54%, when c 0 =0.2 mg•L -1 , pH=6.00±0.05, T=298.15 K, m=0.02 g and t =...