Application of hydroxy-aluminum- and cetyltrimethylammonium bromide-intercalated bentonite for removing acid and reactive dyes

作者：Zahaf Faiza; Dali Nacer; Marouf Reda^*; Ouadjenia Fatima; Schott Jacques

来源：Desalination and Water Treatment, 2016, 57(44): 21045-21053.

DOI：10.1080/19443994.2015.1110728

• Bentonite
• Cethyltrimethylammonium bromide
• Hydroxy-aluminum
• Dyes
• Adsorption isotherm

In this study, modified pillared montmorillonites were prepared using hydroxy-aluminum and cetyltrimethylammonium bromide by the intercalation method and applied as adsorbents to remove acid and reactive dyes from aqueous solutions. The dyes used in this work are Bemacid Yellow E-4G and Procion Yellow MX-4R. The main compositions of raw and pillared bentonite were characterized by chemical composition, X-ray diffraction, and BET specific surface area. The removal efficiency of dyes was studied as a function of pH, initial dye concentrations, and contact time. The removal efficiency of two dyes by cetyltrimethylammonium bromide-intercalated bentonite was more than that of hydroxy-aluminum in similar conditions. The results showed that the maximum adsorption of modified bentonite was obtained at a range of pH 2-3. The maximum adsorption capacity was estimated to be 94mg/g at room temperature. The study of the adsorption kinetic model revealed that the pseudo-second-order model was the best applicable one to describe the adsorption of dyes onto pillared bentonites. Adsorption data were analyzed by both Langmuir and Freundlich adsorption isotherms, and the results showed that it was better described by the Freundlich model.

• 出版日期2016