VISIBLE LIGHT INDUCED PHOTOCATALYTIC DEGRADATION OF METHYL ORANGE IN THE PRESENCE OF Cr(VI)

摘要

In this work, the photocatalytic degradation of methyl orange was successfully achieved by a polymer sensitized TiO_2 under visible light irradiation. It can be observed that over 50% of methyl orange was degraded, which caused by the damage of -N=N-. Moreover, the degradation behavior of methyl orange in the presence of Cr(VI) was also studied. In the methyl orange and Cr(VI) mixed solution, Cr(VI) had no net significant effect on the degradation of methyl orange while methyl orange had negative effect on the reduction of Cr(VI). The UV-Vis absorption spectra study of Cr(VI), methyl orange, and the mixture of methyl orange and Cr(VI) in the dark showed that when Cr(VI) was added to methyl orange solution, the absorption intensities from 350 nm to 400 nm decreased. Based on the spectra and structure study, a kind of complex structure with six-member-ring between Cr(VI) and methyl orange was generated which caused the decrease of Cr(VI).