Estudo da adsorção de surfactante catiônico na matriz inorgânica fosfato de nióbio hidratado Adsorption study of the surfactant in inorganics matrices

Abstract

This work describes the study the adsorption of a cationic surfactant, cetyl trimethyl ammonium bromide (CTAB) in the hydrous niobium phosphate matrix. The matrix was characterized by powder X-ray diffraction (DRX), thermal analysis (TG), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and surface area measurements (BET). The Langmuir and Freundlich isothermal models were used in the CTAB adsorption study. The adsorption process wasn`t favorable for the NbOPO4.nH2O in both studied models.

Keywords

• Langmuir isotherm
• Freundlich isotherm
• hydrous niobium phosphate