Use and recycling of silica gel impregnated with silver nitrate

Química Nova

Braz-Filho, Raimundo¹  Waldman, Walter R.¹  Andreão, Patrícia S. S.¹  Giacomini, Rosana A.¹  Ligiéro, Carolina B. P.¹  Stumbo, Alexandre M.¹  Universidade Estadual de Campinas, Campinas, Brasil¹  Miranda, Paulo C. M. L.¹  Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, Brasil¹ 

关键词: argentation chromatography;    silica gel;    recycling.;   

DOI  :  10.1590/S0100-40422010000100036

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Argentation chromatography is used to increase the selectivity of the chromatographic process, chiefly in the resolution of complex mixtures of nonpolar substances. Although efficient, this technique generates residues containing heavy metal which makes its discarding through common procedures impracticable. In the present work a simple method for recycling of silica, and also silver, from argentation chromatography is described. This procedure uses initially a treatment of H2O2/HNO3, with subsequent treatment with H2O2/H2SO4 , allowing an efficient recycling of both components. This methodology is simple, costless, removes impurities efficiently, and does not modify retention parameters nor specific surface in a significant way.

【 授权许可】

Unknown