CETMIC   05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Surface and Interface properties of BEC-Montmorillonite.
Autor/es:
F. YARZA; R.M. TORRES SANCHEZ; S. TURKER; S. YAPAR
Lugar:
Kosice
Reunión:
Conferencia; 8th MID-EUROPEAN CLAY CONFERENCE; 2016
Institución organizadora:
MID-EUROPEAN CLAY ASOCIATION
Resumen:
In last two decades, the research on the development of new clay based materials has been very active due to their wide area of use from nanocomposite preparation to antibacterial agents. Montmorillonite is the most common type of clay used for the modification because of its high swelling and adsorbing properties [1-3]. In this study montmorillonite (Mt), from Turkey have been modified with benzethonium chloride (BEC) which is a quaternary alkyl ammonium cationic surfactant used as disinfectant. During the research, kinetic and isotherm studies were made as a first step and then Mt modified with BEC by using amounts equal to 50, 100 and 200 % of cation exchange capacity of the Mt were subjected to XRD, ATR-FTIR, zeta potential and DTA/TG analyses for the characterization. The prepared samples were named as 0.5 CEC-BEC-Mt, 1CEC-BEC-Mt and 2CEC-BEC-Mt. Two different heating methods hydrothermal (traditional) and microwave were used. After the modification, percent adsorption of BEC was determined. The adsorption percentage was around at 99 % except for 2 CEC-BEC-Mt where the washing caused approximately 10 % decrease in the adsorption percentage. The results of kinetic studies indicated that adsorption kinetic was rather fast and it was explained by pseudo second order model. Adsorption isotherm fitted to Langmuir model. The results of ATR-FTIR analyses showed the existence of BEC on the surface. According to the XRD analyses, crude clay is a typical Na-Mt with d001=1.22 nm. XRD analysis of the modified Mt showed an increase in the interlayer spacing compared to that of crude clay. The interlayer spacing of the clay for 50 % of CEC increased to 1.54 and 1.55 nm using microwave irradiation and hydrothermal heating, respectively. Zeta potential analysis indicated a similar decrease in negative surface charge with BEC loading increase irrespectively of the preparation method used. Thermal analysis showed a peak at around 299 °C associated to van der Waals interactions decreasing up to 285 °C with the 2 CEC-BEC loading.