EFFECT OF ACTIVATED CARBON CONTENT IN TIO2-LOADED ACTIVATED CARBON ONPHOTODEGRADATION BEHAVIORS OF DICHLOROMETHANE

The effect of the amount of TiO2 loading on activated carbon support o n the photodecomposition of dichloromethane was studied. The apparent adsorption constant of the TiO2-loaded activated carbon for dichlorome thane was found to decrease with increase of the fraction of the loade d TiO2. It was found that the apparent rate constant of CO2 evolution became small with increase of the activated carbon content, suggesting that the adsorbed substrate on the activated carbon support was not e asily involved in the photodecomposition reaction. However, the use of mixed suspensions of TiO2 and activated carbon showed lower activitie s than the TiO2-loaded activated carbon for photodegradation of dichlo romethane. The role of the activated carbon support in the photodecomp osition of dichloromethane is discussed. (C) 1997 Elsevier Science S.A .