研究ノート
Degradation of 4-chloro-4′-hydroxybiphenyl as Model Compound of the PCBs in Aqueous Solution by Advanced Oxidation Processes
2013 年 23 巻 1 号 p. 49-53
詳細
2013 年 23 巻 1 号 p. 49-53
The degradation of 4-chloro-4′-hydroxybiphenyl (4-CHBP), as a model compound of polychlorinated biphenyls, was studied in aqueous solution using advanced oxidation processes (O3/TiO2 and O3/TiO2/H2O2 systems). TiO2 was immobilized by a dip-coating method on the external surface of several glass sheets. The effects of operating variables, including the initial concentrations of ozone and hydrogen peroxide and solution pH, on the degradation rates of 4-CHBP and total organic carbon (TOC) were investigated. In the O3/TiO2/H2O2 system, the effect of varying the mass ratio of hydrogen peroxide to ozone from 0 to 4 (w/w) on the degradation rates of 4-CHBP and TOC was also determined. The degradation of 4-CHBP and TOC increased as a function of ozone concentration in ozonation. Furthermore, the degradation of 4-CHBP was also enhanced by increasing the pH in the O3/TiO2 and O3/TiO2/H2O2 systems. Hydrogen peroxide initially enhanced 4-CHBP and TOC degradation in aqueous solution. However, further increases in the H2O2:O3 mass ratio above 1 (w/w) in the O3/TiO2/H2O2 system negatively affected the degradative action of H2O2 and led to a decrease in 4-CHBP and TOC degradation.
