Oxidation of aqueous chlorobiphenyls with photo-Fenton process

Research of 4-CBP and 4,4'-CBP in aqueous solution using the photo-Fenton p rocess was conducted in two parts. The first part of the study explored the treatment efficiency, revealing that 4-CBP and 4,4'-CBP were easily adsorb ed onto grass. As a result, the true treatment efficiencies of the photo-Fe nton processes were calculated by subtracting the amount of 4-CBP and 4,4'- CBP adsorbed onto glass from the total amount decreased during the treatmen t processes. The results further showed that the most optimum pH for the de gradation and the mineralization of chlorobiphenyls was pH 3. In the second half of this study, the reaction rate expressions of 4-CBP and 4,4'-CBP we re simulated. With respect to the simulated experimental data, the relation ship between the reaction rate of 4-CBP with the H2O2 concentration was exp ressed as a first-order reaction, that for 4,4'-CBP was a zero-order reacti on, and that between the reaction rate and the Fe(II) concentration was a s aturation-type reaction. (C) 1999 Elsevier Science Ltd. All rights reserved .