Quimissorção de cátions divalentes em sílica gel modificada com ácido tioglicólico: a influência do pH e força iônica

Química Nova

Kaline S. De Sousa¹  Vera Lúcia S. Augusto Filha¹  Victor Hugo E A. Pinto¹  Maria G. Da Fonseca¹  José G. P. Espínola¹  Luiza N. H. Arakaki¹ 

[1] ,Universidade Federal da Paraíba Departamento de Química João Pessoa PB ,Brasil

关键词: silica gel;    chemisorption;    thioglycolic acid;   

DOI  :  10.1590/S0100-40422007000300005

来源: SciELO

【 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】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License