Catalytic degradation of humic acid using Fe-doped TiO2-ultrasound hybrid system from aqueous solution

The ability of ultrasound-catalyst hybrid system in degradation of HA, and survey the effective parameters in degradation is the objectives of the present study. The characteristics of the synthesised catalyst was investigated by SEM, XRD and UV-DRS. The performance of the system in pollutant removal was investigated using the OFAT (One Factor at a Time Method) method. The kinetics of the process, mechanism and the reusability of the catalyst were determined in optimised conditions. The results indicated that pH = 3, catalyst dosage = 400 mg/l, HA concentration = 5 mg/l have best efficiency (74%). Superoxide and hydroxyl radicals were considered as the main cause of HA degradation. Catalyst stability was investigated in 5 replicates and verified. The reduction in TOC obtained 45%. The overall results show that the ultrasound Fe-doped TiO2 hybrid system has partial promising performance in degradation of HA.

Automated summary

This study aimed to investigate the ability of an ultrasound-catalyst hybrid system in the degradation of HA and survey the effective parameters in the degradation process. The results showed that under optimized conditions, the system had a good efficiency in HA removal, with superoxide and hydroxyl radicals identified as the main cause of degradation. The stability and reusability of the catalyst were also verified in this study.