文献类型：期刊文献

英文题名：Adsorption and Desorption Behavior of Lithium Ion in Spherical PVC-MnO₂ 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]E China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China

年份：2012

卷号：51

期号：33

起止页码：10921

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000307698200020)】；

基金：The research was supported by NSFC (20906022), the National 863 Program (2012AA061601), STCSM (11dz1205202), and the Fundamental Research Funds for the Central Universities.

语种：英文

摘要：A spherical PVC-MnO2 ion sieve of 2.0-3.5 mm diameter was prepared by the antisolvent method using synthesized Li4Mn5O12 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 (k(f)) and pore diffusivity (D-p) 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 Mg2+ 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 Mg2+ also present in the feed solution. Spherical PVC-MnO2 is an attractive medium for large scale lithium extraction from brine or seawater.