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Preparation of thiocyanate - retaining tannin gel for adsorption recovery of palladium from strong hydrochloric acid solutions / Shintaro Morisada in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12366–12371 Titre : Preparation of thiocyanate - retaining tannin gel for adsorption recovery of palladium from strong hydrochloric acid solutions Type de document : texte imprimé Auteurs : Shintaro Morisada, Auteur ; Yoen-Ho Kim, Auteur ; Shinpei Yakuwa, Auteur Année de publication : 2012 Article en page(s) : pp. 12366–12371 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption  Preparation Résumé : A tannin gel (TG) synthesized from condensed tannin molecules has a remarkable ability to adsorb various metal ions in aqueous solutions. In the present study, we have introduced thiocyanate ions (SCN–) into the TG by adsorption process in acidic thiocyanate solutions to improve its adsorbability for palladium ion, Pd(II). To determine the optimum conditions for preparing the SCN–-retaining tannin gel (SCN-TG), we have investigated the introduction mechanism of SCN– into the TG at 298 K and HCl concentrations less than or equal to 1 M, where the decomposition of SCN– can be negligible. The adsorption amount of SCN– onto the TG increased with increasing HCl concentration, indicating that SCN– is adsorbed onto the TG through the electrostatic attraction between anionic SCN– and the protonated hydroxy groups in the TG at higher HCl concentrations. Using the resultant SCN-TG and the TG, we have conducted the Pd(II) adsorption experiment at molar-level concentrations of HCl and found that the SCN-TG can adsorb Pd(II) efficiently, whereas the TG adsorbs almost no Pd(II). Besides, the adsorbability of the SCN-TG for Pd(II) decreased only slightly with increasing HCl concentration up to at least 5 M. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745707 [article] Preparation of thiocyanate - retaining tannin gel for adsorption recovery of palladium from strong hydrochloric acid solutions [texte imprimé] / Shintaro Morisada, Auteur ; Yoen-Ho Kim, Auteur ; Shinpei Yakuwa, Auteur . - 2012 . - pp. 12366–12371. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12366–12371 Mots-clés : Adsorption  Preparation Résumé : A tannin gel (TG) synthesized from condensed tannin molecules has a remarkable ability to adsorb various metal ions in aqueous solutions. In the present study, we have introduced thiocyanate ions (SCN–) into the TG by adsorption process in acidic thiocyanate solutions to improve its adsorbability for palladium ion, Pd(II). To determine the optimum conditions for preparing the SCN–-retaining tannin gel (SCN-TG), we have investigated the introduction mechanism of SCN– into the TG at 298 K and HCl concentrations less than or equal to 1 M, where the decomposition of SCN– can be negligible. The adsorption amount of SCN– onto the TG increased with increasing HCl concentration, indicating that SCN– is adsorbed onto the TG through the electrostatic attraction between anionic SCN– and the protonated hydroxy groups in the TG at higher HCl concentrations. Using the resultant SCN-TG and the TG, we have conducted the Pd(II) adsorption experiment at molar-level concentrations of HCl and found that the SCN-TG can adsorb Pd(II) efficiently, whereas the TG adsorbs almost no Pd(II). Besides, the adsorbability of the SCN-TG for Pd(II) decreased only slightly with increasing HCl concentration up to at least 5 M. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745707