Sonochemical degradation of p-chlorophenol assisted by H2O2 and Ag-TiO2 / TiO2 catalyst

Abstract

The degradation of p-chlorophenol in aqueous solution by low frequency ultrasound (30 kHz) has been studied. The degradation of p-chlorophenol in US/H₂O₂, US/ Ag- TiO₂ US/TiO₂, US/TiO₂/H₂O₂ and US/ Ag-TiO₂/H₂O₂ systems is also compared. The maximum removal of p-chlorophenol i.e 75% is observed in US/ Ag-TiO₂/H₂O₂ system where as 37% removal is observed in US/TiO₂/H₂O₂ system. Further the effect of initial substrate concentration, pH and temperature on the initial rate of degradation of the model pollutant have also been investigated. Studies reveal that the initial rate of degradation increases with increase in initial substrate concentration whereas the initial rate of degradation decreases with an increase in pH and reaction temperature.