Print version ISSN 0366-6913
PEREIRA, P. H. F. and SILVA, M. L. C. P. da. Adsorption study of the cationic surfactant in inorganic matrices prepared from niobium oxides. Cerâmica [online]. 2009, vol.55, n.335, pp. 312-317. ISSN 0366-6913. http://dx.doi.org/10.1590/S0366-69132009000300011.
One of the applications that have been studied for niobium is the adsorption process, in the form of hydrous phosphates. These materials are constituted of lamellar crystals, what make them possible to be used in adsorption processes and polar molecules intercalation as the cationic as the cationic surfactant cetyltrimethyammonium bromide (CTAB). This work describes the adsorption study for cationic cetytrimetlyl ammonium bromide (CTAB) surfactant in the niobium oxide matrix. The material was characterized by X-ray diffraction, thermogravimetry, scanning electron microscopy and surface area measurements. The Langmuir and Freundlich isotherm models were used for the CTAB adsorption study. In the adsorption process the pH effect has been studied and it could be observed that the largest adsorption value was in pH 3.0 with Qo 16.52 mg/g. The adsorption process was favorable for the Langmuir model and not favorable for the Freundlich one.
Keywords : adsorption; Langmuir isotherm; Freundlich isoterm.