Investigation of removal of crystal violet dye using novel hybrid technique involving hydrodynamic cavitation and hydrogel

Publication date: Available online 9 August 2018Source: Journal of Environmental Chemical EngineeringAuthor(s): Aman Raj, Bhaskar Bethi, Shirish H. SonawaneAbstractIn this work, intensification of removal of crystal violet (CV) dye in terms of total organic carbon (TOC) from aqueous media has been investigated by a novel hybrid treatment technique involving hydrodynamic cavitation (HC), and hydrogel adsorption. Hydrodynamic cavitation (HC) combined with poly-acrylamide (PAM) hydrogel nano-composite was studied for CV dye removal. TiO2 nano-particles embedded poly-acrylamide (PAM) nano-composite hydrogel was prepared by using the ultrasound polymerization technique. Characteristics of TiO2 nano-particles and hydrogel nano-composite were studied by using XRD and TEM analysis respectively. Degradation of CV dye was carried out by hydrodynamic cavitation and subsequent adsorption of dye molecules were carried out in hydrogel adsorption column. Effect of different operating parameters such as inlet pressure to the cavitation device (orifice), the effect of TiO2 loading in PAM hydrogel, effect of hydrogel loading in the adsorption column was studied. For hydrogel loading of 5 g/L and inlet pressure to orifice at 3 bar, the hybrid system intensifies the removal of dye in terms of operating time compared to its individual operation. Studies revealed that the PAM-TiO2 hydrogel obeys the pseudo-second order kinetic model for CV dye adsorption. Two adsorption isotherm models such as...
Source: Journal of Environmental Chemical Engineering - Category: Chemistry Source Type: research