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.