Adsorption and desorption behavior of lithium ion in spherical PVC – MnO2 ion sieve / Guoping Xiao in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10921–10929 Titre : Adsorption and desorption behavior of lithium ion in spherical PVC – MnO2 ion sieve Type de document : texte imprimé Auteurs : Guoping Xiao, Auteur ; Kefeng Tong, Auteur ; Longsheng Zhou, Auteur Année de publication : 2012 Article en page(s) : pp. 10921–10929 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorption Lithium Ion Résumé : 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 (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 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. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300087s [article] Adsorption and desorption behavior of lithium ion in spherical PVC – MnO2 ion sieve [texte imprimé] / Guoping Xiao, Auteur ; Kefeng Tong, Auteur ; Longsheng Zhou, Auteur . - 2012 . - pp. 10921–10929. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10921–10929 Mots-clés : Adsorption Lithium Ion Résumé : 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 (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 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. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300087s

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