Ultrasonic-coupled photocatalytic regeneration of phenol-saturated activated carbons
The ultrasound and photocatalytic technology are coupled(US/UV)to regenerate the activated carbon saturated with adsorbed phenol.The regeneration effects under the three process conditions of photocatalysis,ultrasound and ultrasound coupling photocatalysis are compared.The effects of TiO2 addition concentration,ultrasonic power and initial pH of regeneration solution on the regeneration of activated carbon were investigated,and the changes in the structure of activated carbon before and after regeneration by different proces-ses were analyzed.The experimental results show that the regeneration effect of the US/UV coupling process is better than that of the photocatalytic regeneration and ultrasonic regener-ation alone.When the TiO2 concentration was 100 mg/L,the ultrasonic power was 100 W,and the pH was 7-9,the regeneration efficiency of the US/UV coupling process reached 74.51%;the destruction of the pore structure of the activated carbon was small,and the de-gree of recovery of the micropores was high.The US/UV coupling process was characterized by fast regeneration rate,low concentration of the regeneration solution phenol residue,and stable regeneration effect.
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