Oxidation of aqueous chlorobiphenyls with photo-fenton process

Research of 4-CBP and 4,4′-CBP in aqueous solution using the photo-Fenton process 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 adsorbed onto glass. As a result, the true treatment efficiencies of the photo-FentDn processes were calculated by subtracting the amount of 4-CBP and 4,4′-CBP adsorbed onto glass from the total amount decreased during the treatment processes. The results further showed that the most optimum pH for the degradation 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 were simulated. With respect to the simulated experimental data, the relationship between the reaction rate of 4-CBP with the H2O2 concentration was expressed as a first-order reaction, that for 4,4′-CBP was a zero-order reaction, and that between the reaction rate and the Fe(II) concentration was a saturation-type reaction.