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Selective adsorption of precious metals from hydrochloric acid solutions using porous carbon prepared from barley straw and rice husk / Rumi Chand in Minerals engineering, Vol. 22 N° 15 (Décembre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 15 (Décembre 2009) . - pp. 1277–1282 Titre : Selective adsorption of precious metals from hydrochloric acid solutions using porous carbon prepared from barley straw and rice husk Type de document : texte imprimé Auteurs : Rumi Chand, Auteur ; Takanori Watari, Auteur ; Katsutoshi Inoue, Auteur Année de publication : 2010 Article en page(s) : pp. 1277–1282 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Rice  husk  Barley  straw  Porous  carbon  Adsorption  Precious  metals Résumé : Porous carbon was prepared by carbonization from agro-waste such as rice husk and barley straw to evaluate the adsorption of precious and base metals from metal solutions. The effects of hydrochloric acid concentration, metal ion concentration, and contact time on adsorption were examined. Rice husk carbon was found to be highly selective for Au(III) and inert to Pt(IV), Pd(II) and other base metals. Barley straw carbon adsorbed these three precious metal ions, but was inert to base metal ions such as Cu(II), Fe(III) and Ni(II). The maximum adsorption capacity of rice husk carbon for Au(III) was 0.76 mol/kg and the maximum adsorption capacity of barley straw carbon for Au(III), Pt(IV) and Pd(II) was 1.47, 0.39 and 0.64 mol/kg, respectively. The effectiveness of recovery of precious metals from industrial solution was also tested and barley straw carbon was found to be highly efficient and selective for the targeted metal ions in the presence of excess of other metal ions. Rice husk and barley straw carbon are thus potential alternatives to commercially available activated carbon as they have high selectivity and are efficient with low production costs. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001721 [article] Selective adsorption of precious metals from hydrochloric acid solutions using porous carbon prepared from barley straw and rice husk [texte imprimé] / Rumi Chand, Auteur ; Takanori Watari, Auteur ; Katsutoshi Inoue, Auteur . - 2010 . - pp. 1277–1282. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 15 (Décembre 2009) . - pp. 1277–1282 Mots-clés : Rice  husk  Barley  straw  Porous  carbon  Adsorption  Precious  metals Résumé : Porous carbon was prepared by carbonization from agro-waste such as rice husk and barley straw to evaluate the adsorption of precious and base metals from metal solutions. The effects of hydrochloric acid concentration, metal ion concentration, and contact time on adsorption were examined. Rice husk carbon was found to be highly selective for Au(III) and inert to Pt(IV), Pd(II) and other base metals. Barley straw carbon adsorbed these three precious metal ions, but was inert to base metal ions such as Cu(II), Fe(III) and Ni(II). The maximum adsorption capacity of rice husk carbon for Au(III) was 0.76 mol/kg and the maximum adsorption capacity of barley straw carbon for Au(III), Pt(IV) and Pd(II) was 1.47, 0.39 and 0.64 mol/kg, respectively. The effectiveness of recovery of precious metals from industrial solution was also tested and barley straw carbon was found to be highly efficient and selective for the targeted metal ions in the presence of excess of other metal ions. Rice husk and barley straw carbon are thus potential alternatives to commercially available activated carbon as they have high selectivity and are efficient with low production costs. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001721

Trimethylamine-modified lignophenol for the recovery of precious metals / Durga Parajuli in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10163–10168 Titre : Trimethylamine-modified lignophenol for the recovery of precious metals Type de document : texte imprimé Auteurs : Durga Parajuli, Auteur ; Koichi Hirota, Auteur ; Katsutoshi Inoue, Auteur Année de publication : 2010 Article en page(s) : pp. 10163–10168 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Trimethylamine-Modified--Lignophenol--Recovery--Precious--Metals Résumé : A quaternary amine-type sorbent has been prepared by the immobilization of trimethylamine group onto the cross-linked lignophenol matrix. The sorption behavior for a number of metal ions was studied in hydrochloric acid medium. From the batch test of individual metal ion as well as the mixture solution containing equal molar concentration of various metal ions, the sorbent was found to hold selectivity for Au(III), Pd(II), and Pt(IV) ions only with negligible sorption for other metal ions like Cu(II), Co(II), Fe(III), Ni(II), and Zn(II). The sorption kinetics was studied at 30, 50, and 65 °C and elucidated the order of sorption of Au(III), Pd(II), and Pt(IV) and from the values of rate constants at different temperatures, the energy of activation has been evaluated. The sorption isotherm study revealed the Langmuir type sorption and from the Langmuir charts the maximum loading capacity of Au(III), Pd(II), and Pt(IV) has been evaluated. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801829w [article] Trimethylamine-modified lignophenol for the recovery of precious metals [texte imprimé] / Durga Parajuli, Auteur ; Koichi Hirota, Auteur ; Katsutoshi Inoue, Auteur . - 2010 . - pp. 10163–10168. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10163–10168 Mots-clés : Trimethylamine-Modified--Lignophenol--Recovery--Precious--Metals Résumé : A quaternary amine-type sorbent has been prepared by the immobilization of trimethylamine group onto the cross-linked lignophenol matrix. The sorption behavior for a number of metal ions was studied in hydrochloric acid medium. From the batch test of individual metal ion as well as the mixture solution containing equal molar concentration of various metal ions, the sorbent was found to hold selectivity for Au(III), Pd(II), and Pt(IV) ions only with negligible sorption for other metal ions like Cu(II), Co(II), Fe(III), Ni(II), and Zn(II). The sorption kinetics was studied at 30, 50, and 65 °C and elucidated the order of sorption of Au(III), Pd(II), and Pt(IV) and from the values of rate constants at different temperatures, the energy of activation has been evaluated. The sorption isotherm study revealed the Langmuir type sorption and from the Langmuir charts the maximum loading capacity of Au(III), Pd(II), and Pt(IV) has been evaluated. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801829w