Degradation of Reactive Black 5 using combined electrochemical degradation-solar-light/immobilized TiO2 film process and toxicity evaluation

作者：Wang Kai sung; Chen Hsueh Yu; Huang Long Chiu; Su Yu Chun; Chang Shih Hsien^*

来源：Chemosphere, 2008, 72(2): 299-305.

DOI：10.1016/j.chemosphere.2008.02.012

• azo dye
• Vibrio fischeri
• electrochlorination
• solar photo-catalysis

The combined electrochemical oxidation-solar-light/immobilized TiO2 film process was conducted to degrade an azo dye, Reactive Black 5 (RB5). The toxicity was also monitored by the Vibrio fischeri light inhibition test. The electrochemical oxidation rapidly decolorized RB5 (55, 110 mu M) with a supporting electrolyte of 2 g l(-1) NaCl at current density 277 A m(-2) and pH 4. However, TOC mineralization and A(310) removal were low. Additionally, the treated solution showed high biotoxicity. RB5 at 110 mu M significantly retarded the de-colorization efficiency by using the solar-light/immobilized TiO2 film process. The combined electrochemical oxidation-solar-light/immobilized TiO2 process effectively increased the removal of color, A310, and TOC. The toxicity was also significantly reduced after 3 h of solar irradiation. The results indicated that the low-cost combined process is it potential technique for rapid treatment of RB5.

• 出版日期2008-5