A 2-mercaptobenzothiazole-functionalized ionic liquid for selective extraction of Pd(ii) from a hydrochloric acid medium. Issue 67 (1st July 2016) - Zhang, Hong
Abstract : A novel 2-mercaptobenzothiazole-functionalized ionic liquid (1, 10-bis(3-methylimidazolium-1-yl)decane bis(triflic)imide two 2-mercaptobenzothiazolate, {[C10 (mim)2 ] 2+ 2 [MBT] − }) with excellent selectivity for Pd(ii ) extraction was fabricated. Abstract : A novel 2-mercaptobenzothiazole-functionalized ionic liquid (1, 10-bis(3-methylimidazolium-1-yl)decane bis(triflic)imide two 2-mercaptobenzothiazolate, {[C10 (mim)2 ] 2+ 2[MBT] − }) with excellent selectivity for Pd(ii ) extraction was fabricated. Variable factors ( e.g., functional ionic liquid concentration, hydrochloric acid concentration, sodium chloride concentration, sodium nitrate concentration and hydrogen ion concentration) were also investigated for extraction experiments. Accordingly, a special complexation extraction mechanism was proposed and confirmed by further experiments. Moreover, higher selectivity towards Pd(ii ) extraction was realized over other metal ions especially Pt(iv ). Furthermore, 0.5 M thiourea/1.0 M HCl was recognized as an efficient stripping agent for the Pd(ii ) loaded organic phase. Consequently, together with high efficiency and selectivity, the 2-mercaptobenzothiazolate-functionalized ionic liquid can act as a high selective extractant for Pd(ii ) extraction.