Synthesis of Fe2O3/TiO2 Nanotube and its Application in Photoelectrocatalytic/photoelectro-Fenton Decolorization of Rhodamine B

摘要

In this study, TiO2 nanotube (TNTs) electrodes were synthesized via direct anodic oxidation and TiO2 nanotubes modified with Fe2O3 (Fe2O3/TNTs) electrodes were obtained by electrochemical deposition method. The decolorization of Rhodamine B wastewater by solar photocatalytic/photoelectro-Fenton coupling system was investigated, where Fe2O3/TNTs electrodes and activated carbon fibre (ACF) were used as anode and cathode, respectively. The results indicated that uniform TiO2 nanotube was obtained and the diameter ranged from 40 to 50 nm. UV-Vis DRS results revealed that the modified Fe2O3/TNTs electrodes showed a stronger response in the visible region compared with TNTs electrodes. Parameters had a big influence on solar photocatalytic/photoelectro-Fenton decolorization of Rhodamine B, the decolorization of Rhodamine B reached 96.6% within 60 min at the optimum conditions. The pseudo-first-order was used to fit the dynamic data with a rate constant of 0.05472 +/- 0.00134 min(-1). Hydroxyl radical and photo generated hole were the main active species contributed to Rhodamine B decolorization, making a contribution of 76.6% and 16.6%, respectively.