Chemisorption of divalent cations on a silica gel surface modifield with thioglycolic acid: pH influence and ionic strength

Química Nova

Espínola, José G. P.¹  Pinto, Victor Hugo e A.¹  Fonseca, Maria G. da¹  Universidade Federal da Paraíba, João Pessoa, Brasil¹  Augusto Filha, Vera Lúcia S.¹  Sousa, Kaline S. de¹  Arakaki, Luiza N. H.¹ 

关键词: silica gel;    chemisorption;    thioglycolic acid.;   

DOI  :  10.1590/S0100-40422007000300005

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A novel type of heavy metal adsorbent was prepared by the covalent grafting of thioglycolic acid molecules on a silica gel surface previsiouly modified with 3-aminopropyltrimethoxysilane. The amount of thioglycolic acid immobilized was 1.03 mmol per gram of silica. This material displayed a chelating moiety containing nitrogen, sulfur, and oxygen basic centers which are potentially capable of extracting from aqueous solutions cations such as Cu(II), Ni(II), Co(II), influenced by pH and ionic strength. This process of extraction was carried out by the batch method when similar chemisorption isotherms were observed for all cations. A modified Langmuir equation describes the experimental data.

【 授权许可】

Unknown