Investigation of TiO2 photocatalyst performance for decolorization in the presence of hydrodynamic cavitation as hybrid AOP

Abstract

In this article, an acoustic cavitation engineered novel approach for the synthesis of TiO2, cerium and Fe doped TiO2 nanophotocatalysts is reported. The prepared TiO2, cerium and Fe doped TiO2 nanophotocatalysts were characterized by XRD and TEM analysis to evaluate its structure and morphology. Photo catalytic performance of undoped TiO2 catalyst was investigated for the decolorization of crystal violet dye in aqueous solution at pH of 6.5 in the presence of hydro dynamic cavitation. Effect of catalyst doping with Fe and Ce was also studied for the decolorization of crystal violet dye. The results shows that, 0.8% of Fe-doped TiO2 exhibits maximum photocatalytic activity in the decolorization study of crystal violet dye due to the presence of Fe in the TiO2 and it may acts as a fenton reagent. Kinetic studies have also been reported for the hybrid AOP (HAOP) that followed the pseudo first-order reaction kinetics.

Controlled Hydrodynamic Cavitation: A Review of Recent Advances and Perspectives for Greener Processing

“…Operating HC, in combination with ozone, resulted in 100% decolorization with a 72% reduction in the total carbon content (TOC) of the RB13 solution. Bethi et al [71] studied the degradation of crystal violet dye in aqueous solution using circular venturi-based HC and HC combined with photocatalytic oxidation. HC alone caused 45% degradation of the dye, whereas it increased to 98% when HC was combined with photocatalytic oxidation (0.6 g/L of Fe-TiO 2 ).…”

Facile Synthesis and Characterization of Ag3PO4 Microparticles for Degradation of Organic Dyestuffs under White-Light Light-Emitting-Diode Irradiation

“…Advanced oxidation processes (AOPs) have gained considerable attention for the treatment of organic dyestuffs polluted environmental water matrices [ 1 , 2 , 3 , 4 ]. Among the various AOPs, heterogeneous photocatalysis, which employs semiconductor-based photocatalysts, has been the subject of numerous studies on due to its ability to decompose organic compounds under solar light irradiation [ 5 , 6 , 7 , 8 , 9 ]. For example, the heterogeneous photocatalyst TiO 2 is considered an excellent material for water treatment because it is cheap, nontoxic and abundant in nature [ 5 , 6 , 10 , 11 ].…”

“…Among the various AOPs, heterogeneous photocatalysis, which employs semiconductor-based photocatalysts, has been the subject of numerous studies on due to its ability to decompose organic compounds under solar light irradiation [ 5 , 6 , 7 , 8 , 9 ]. For example, the heterogeneous photocatalyst TiO 2 is considered an excellent material for water treatment because it is cheap, nontoxic and abundant in nature [ 5 , 6 , 10 , 11 ]. However, its inefficient photocatalytic degradation and antibacterial activity render it non-ideal for practical applications because of the rapid recombination of its photogenerated electron–hole pairs leading to high operating costs [ 12 ].…”

Application of Hydrodynamic Cavitation Reactors for Treatment of Wastewater Containing Organic Pollutants: Intensification Using Hybrid Approaches

“…The cavitation effects contribute to the enhancement in the OH radical formation by accelerating the transfer of an electron from the valence band to the conduction band, as well as turbulence generated by cavitation helps in continuous cleaning of catalysts allowing efficient photocatalytic activity for longer irradiation times [43]. Bethi et al [55] studied the decolorization of crystal violet dye using the hybrid method involving HC and undoped, as well as doped TiO 2 catalyst using circular venturi as a cavitating device. It was reported that the combination of HC and Fe-doped TiO 2 (0.8% Fe) in the presence of UV lamp (125 W) resulted in 98% decolorization whereas, the combination of HC and Ce-doped TiO 2 (0.8% Ce) resulted in 84% of decolorization for catalyst loading of 0.6 g/L.…”