文献类型：期刊文献

英文题名：Adsorption and desorption behavior of lithium ion in spherical PVC-MnO 2 ion sieve

作者：Xiao, Guoping[1]; Tong, Kefeng[1]; Zhou, Longsheng[1]; Xiao, Jiali[1]; Sun, Shuying[1]; Li, Ping[1]; Yu, Jianguo[1]

机构：[1] National Engineering Research Center for Integrated Utilization of Salt Lake Resources, East China University of Science and Technology, Shanghai, China

年份：2012

卷号：51

期号：33

起止页码：10921

外文期刊名：Industrial and Engineering Chemistry Research

收录：EI(收录号：20123615391291)

语种：英文

外文关键词：Adsorption - Desorption - Ions - Ionic liquids - Lithium - Manganese oxide - Mass transfer - Spheres - Ion exchange - Lithium compounds - Isotherms - Sieves

摘要：A spherical PVC-MnO2 ion sieve of 2.0-3.5 mm diameter was prepared by the antisolvent method using synthesized Li4Mn 5O12 ultrafine powder as the precursor, poly(vinyl chloride) as the binder, and N-methyl-2-pyrrolidone as solvent. Batch experiments of the adsorption capacity (isotherm) and adsorption rate of Li + on the spherical PVC-MnO2 ion sieve were studied. Spherical PVC-MnO2 had a high adsorption capacity for Li+, and the isotherm data were well fitted by the Langmuir model; the adsorption kinetics were well described by the Lagergren equation. Furthermore, a mathematical model was set up to calculate the film mass transfer coefficient (kf) and pore diffusivity (Dp) of the adsorbent. Continuous flow experiments for study of Li+ adsorption breakthrough and the subsequent desorption (elution) in a PVC-MnO2 packed column were carried out employing six feed solutions of various pH values and concentrations of Li+, Na+, K+, and Mg 2+ for simulating brine samples of various salt lakes and/or seawaters. After the adsorption treatment to concentrate the Li+ on PVC-MnO2, the column was regenerated by 1.0 mol/L HCl which supplied H+ to accomplish elution of the adsorbed Li+ by ion exchange. The experimental results demonstrate that PVC-MnO2 had high selectivity for Li+ and that its adsorption of Li+ from the feed were little affected by Na+, K+, and Mg 2+ also present in the feed solution. Spherical PVC-MnO2 is an attractive medium for large scale lithium extraction from brine or seawater. ? 2012 American Chemical Society.