Argilas especiais: argilas quimicamente modificadas - uma revisão

Abstract

Recebido em 5/4/06; aceito em 17/11/06; publicado na web em 24/7/07 SPECIAL CLAYS: CHEMICALLY MODIFIED CLAYS – A REVIEW. The simultaneous use of the specific values of some structural and chemical properties of clay minerals, such as kaolinite, montmorillonite and talc, allows the development of new properties for these materials, especially in relation to the external and internal microcrystal surfaces. These developments are very diversified for montmorillonite, due to the high specific surface area, expansible basal spacings, easy intercalation inside the 2:1 structural layers and a reversible and high cation exchance capacity. The review presents examples of chemical modifications on kaolins, montmorillonites (bentonites) and talcs.