Equilibrium, kinetic and mechanism studies on adsorption of textile disperse dye from aqueous solution onto TiO2 in the presence of ultrasound and rare earth ions

Removal of Disperse Orange 30 (DO 30) or Yellow Brown S2RFL Dye in aqueous solutions has been reported by adsorption on TiO2 in the presence of ultrasound and rare earth ions (RE, La+3 and Gd+3) with dye concentration of 8, 16 and 24 ppm respectively. Effects of operating parameters such as initial dye concentration, amount of adsorption, contact time and pH on the decolorization of dye have also been examined. The adsorption data has been tested simultaneously with Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherms respectively but found fitting best with Langmuir isotherm. The adsorption followed pseudo second order kinetics and Boyd kinetic plot confirmed that the external mass transfer was the slow step in this process. Percent removal of DO 30 at 8 ppm of dye concentration and 0.02 mL of (nBuO)(4)Ti, under different experimental conditions of adsorption was found to be; TiO2 (approximate to 14%), TiO2 + US (20%), TiO2 + La/Gd (97%), and US + TiO2 + La/Gd (98%). Therefore the removal of DO 30 in the presence of TiO2 and La+3 / Gd+3 could be a potential process for the removal of DO 30 dye from aqueous solutions. (C) 2021 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Materials, Processing & Characterization.

Automated summary

The removal of Disperse Orange 30 (DO 30) or Yellow Brown S2RFL Dye in aqueous solutions using TiO2 adsorption in the presence of ultrasound and rare earth ions has been reported. The adsorption data was best fitted with Langmuir isotherm, indicating the potential of TiO2 and La+3 / Gd+3 combination as a method for dye removal.