Analytical Chemistry Department, Institute of Chemistry, Federal University of Rio de Janeiro, Av Athos da Silveira Ramos, 149 room A509, 21941-909 Ilha do Fundão, Rio de Janeiro, Brazil.
J Hazard Mater. 2011 Sep 15;192(3):1155-60. doi: 10.1016/j.jhazmat.2011.06.021. Epub 2011 Jul 8.
This work describes a route for platinum recovery from spent commercial Pt and PtSnIn/Al(2)O(3) catalysts using strong basic mesoporous and macroporous anion exchange resins (Cl(-) form). The catalysts were leached with aqua regia (75 °C, 20-25 min). Platinum adsorption was influenced by the presence of other metals which form chlorocomplexes (tin, indium) and also base metals (aluminum). However, it was possible to overcome this fact by a sequential desorption procedure. Aluminum was selectively removed from the resins by elution with 3 mol L(-1) HCl. Platinum was desorbed passing 1 mol L(-1) Na(2)S(2)O(3) (pH 9). Tin was removed by elution with 0.1 mol L(-1) ascorbic acid. Indium was removed using 0.1 mol L(-1) EDTA as eluent. Desorption efficiency exceeded 99% for all metals. Metals were recovered in high yields (>98 wt%).
本工作描述了一种从废商用 Pt 和 PtSnIn/Al(2)O(3)催化剂中回收铂的方法，使用强碱性中孔和大孔阴离子交换树脂（Cl(-)形式）。催化剂用王水（75°C，20-25 分钟）浸出。铂的吸附受形成氯络合物的其他金属（锡、铟）和基础金属（铝）的存在影响。然而，通过顺序解吸程序可以克服这一事实。铝通过用 3 mol L(-1) HCl 洗脱从树脂中选择性去除。铂通过用 1 mol L(-1) Na(2)S(2)O(3)（pH 9）洗脱解吸。锡通过用 0.1 mol L(-1)抗坏血酸洗脱去除。铟用 0.1 mol L(-1) EDTA 作为洗脱剂洗脱。所有金属的解吸效率均超过 99%。金属以高收率（>98wt%）回收。
