Insight into surface and structural changes of montmorillonite and organomontmorillonites loaded with Ag

FERNÁNDEZ SOLARTE, ALEJANDRA M.; VILLARROEL-ROCHA, JHONNY; MORANTES, CÉSAR FERNÁNDEZ; MONTES, MARIA L.; SAPAG, KARIM; CURUTCHET, GUSTAVO; TORRES SÁNCHEZ, ROSA M.

COMPTES RENDUS CHIMIE

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

Lugar: Paris; Año: 2018

1631-0748

A raw montmorillonite (MMT) and three organomontmorillonites (OMMTs) with differentamounts of hexadecyltrimethylammonium bromide (HDTMABr), and further silver loading(MMTeAg or OMMTeAg) were used to study their surface and structural changes andfungicidal activity. For OMMT and OMMTeAg samples, the specific surface area andmicropore amount decreased with the increase in surfactant loading, whereas texturalproperties remained constant. Surfactant entrance into the interlayer with the increase insurfactant loading was irrespective of Ag loading, whereas a decreasing number of stackedclay platelets and loss of surfactant were found after Ag incorporation. Ag nanoparticles of different sizes and large silver aggregates found in OMMTeAg altered the electric surfacecharge as compared with the OMMT samples. Although the surfactant loading up to actual 100% of the MMT cation exchange capacity decreased silver retention, for MH2eAg sample (with 200% HDTMA loaded with respect to the MMT´s cation exchange capacity, and further Ag loading) silver retention was close to that of MMT and null silver lixiviationcould be assigned to the HDTMAeAg complex and AgBr formation. Fungicidal activity was correlated with surfactant loading, increasing with Ag addition