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

Quimica nova

Espínola, José G. P.¹  Pinto, Victor Hugo e A.¹  Fonseca, Maria G. da¹  Sousa, Kaline S. de¹  Augusto Filha, Vera Lúcia S.¹  Arakaki, Luiza N. H.¹ 

[1] Universidade Federal da Paraíba, João Pessoa, Brasil

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 ofheavy metal adsorbent was prepared by the covalent grafting of thioglycolicacid 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, andoxygen basic centers which are potentially capable of extracting from aqueoussolutions cations such as Cu(II), Ni(II), Co(II), influenced by pH and ionicstrength. This process of extraction was carried out by the batch method whensimilar chemisorption isotherms were observed for all cations. A modified Langmuirequation describes the experimental data.

【 授权许可】

CC BY