An insight on the design of mercapto functionalized swelling brittle micas

Francisco J Osuna; Esperanza Pavón; María D Alba

doi:10.1016/j.jcis.2019.11.028

An insight on the design of mercapto functionalized swelling brittle micas

J Colloid Interface Sci. 2020 Mar 1:561:533-541. doi: 10.1016/j.jcis.2019.11.028. Epub 2019 Nov 11.

Authors

Francisco J Osuna¹, Esperanza Pavón¹, María D Alba²

Affiliations

¹ Instituto Ciencia de los Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain.
² Instituto Ciencia de los Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain. Electronic address: alba@icmse.csic.es.

PMID: 31740136
DOI: 10.1016/j.jcis.2019.11.028

Abstract

Surface modification of natural clay minerals with reagents containing metal chelating groups has great environmental value. The functionalization by adsorption or grafting guarantees a durable immobilization of the reactive organic groups, preventing their leaching when they are used in liquid media. The aim of this research was the designed mercapto functionalization of swelling brittle micas, Na-Mn, thorough both chemical and physical mechanisms. Na-Mn were functionalized with 2-mercaptoethylammonium (MEA), 2,3-dimercapto-1-propanol (BAL) and (3-mercaptopropyl)trimethoxysilane (MPTMS). The thiol concentration on swelling brittle micas is higher than the observed value for others adsorbents. The cation exchange reaction with MEA and one-step grafting with MPTMS in acid medium are the most efficient mercapto functionalization mechanism.

Keywords: Designed materials; Functionalized surface; Grafting; Thiol groups.