纳米TiO_2薄膜电极光电催化降解染料RhB的研究

Research on photoelectrocatalytic degradation of dye RhB by TiO_2-film electrodes

The prepared TiO2 suspension by sol-gel and hydrothermal method is spread on conducting glass substrates to prepare the photoelectrodes.The degradation of RhB at different bias under visible irradiation is researched.By the examination of UV-visible spectroscopy、degraded intermediates and removal yield of total organic carbon,the effect of bias on the photoelectrocatalytic degradation of RhB is investigated.It is found that N-dealkylation process predominates at positive bias(+0.6V vs SCE).Five N-de-ethylated intermediates are detected by HPLC.The removal yield of TOC is low,though dye RhB also discolors.But a rather facile cleavage of the whole conjugated chromophore structure of RhB at negative bias of-0.6 V vs SCE leads to the high mineralization yield.

The prepared TiO2 suspension by sol-gel and hydrothermal method is spread on conducting glass substrates to prepare the photoelectrodes. The degradation of RhB at different bias under visible irradiation is researched. By the examination of UV-visible spectroscopy,degraded intermediates and removal yield of total organic carbon, the effect of bias on the photoelectrocatalytic degradation of RhB is investigated. It is found that N-dealkylation process predominates at positive bias（ ＋ O. 6V vs SCE）. Five N- de-ethylated intermediates arc detected by HPLC. The removal yield of TOC is low, though dye RhB also discolors. But a rather facile cleavage of the whole conjugated chromophore structure of RhB at negative bias of-0. 6 V vs SCE leads to the high mineralization yield.