Use and recycling of silica gel impregnated with silver nitrate

Quimica nova

Ligiéro, Carolina B. P.¹  Miranda, Paulo C. M. L.¹  Braz-Filho, Raimundo²  Waldman, Walter R.²  Andreão, Patrícia S. S.²  Giacomini, Rosana A.²  Stumbo, Alexandre M.² 

[1] Universidade Estadual de Campinas, Campinas, Brasil;Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, Brasil

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 chromatographyis used to increase the selectivity of the chromatographic process, chieflyin the resolution of complex mixtures of nonpolar substances. Although efficient,this technique generates residues containing heavy metal which makes its discardingthrough common procedures impracticable. In the present work a simple methodfor recycling of silica, and also silver, from argentation chromatography isdescribed. 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 parametersnor specific surface in a significant way.

【 授权许可】

CC BY