Photocatalytic oxidation of chlorophenols in the presence of manganese ions

The decomposition of chlorophenols in aqueous solution with UV-illuminated TiO2 suspensions in the presence of manganese ions was studied. It was foun d that the removal rare of chlorophenols would be the highest at pH 3 in th e presence of 1.18x10(-4) M manganese ion. The effect of ionic strength on the 2-CP decomposition can be ignored in the range from 0.1 to 0.005 M for NaClO4. This study is also to explore the relationship between the adsorpti on rate and reaction rate. Results showed that the more the adsorption rate the more the decomposition rate for the three chlorophenols. Manganese ion s can increase the photocatalytic oxidation of 2-chlorophenol in terms of D OC. The relationship between temperature and reaction rate for 2-CP is k = 0.0043 T - 1.2146. (C) 1999 Published by Elsevier Science Ltd on behalf of the IAWQ. All rights reserved.