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Article – Journal of Nanoscience and Technology

Journal of Nanoscience and Technology, Volume 3,Issue 3,2017 Pages 273-280

Removal of Cationic Dyes from Aqueous Solution by Adsorption on Mesoporous TiO2-SiO2 Nanocomposite
R. Ranjith, P. Shameela Rajam*

The main objective of this work is to study the isotherm and kinetic models for the adsorption of cationic dyes like methylene blue (MB) and crystal violet (CV) on mesoporous TiO2-SiO2 nanocomposite. The formation of nanocomposite was confirmed using X-ray diffraction, FT-IR spectral analysis, scanning electron microscopy with energy dispersive spectra, transmission electron microscope, BET surface area and UV-Vis diffused reflectance spectra (DRS). The adsorption of MB and CV was studied in batch mode experiments and it was found to be highly dependent on solution pH, contact time, dose and concentration. The cationic dyes adsorption process followed the pseudo-second-order rate model. The Langmuir adsorption isotherm with a maximum adsorption capacity of MB and CV for 333.33 and 90.91 mg/g respectively. The thermodynamic studies reveals that the adsorption of MB and CV onto TiO2-SiO2 surface was spontaneous, endothermic and through a process of physisorption. The results also visible that the mesoporous TiO2-SiO2 nanocomposite was much more effective for the adsorption of cationic dyes, and it retained its original adsorption capacity for six successive cycles of adsorption−desorption.

Keywords: TiO2-SiO2; Cationic Dyes; Methylene Blue; Crystal Violet; Thermodynamic Study;