Wang Kai-Sung, Chen Hsueh-Yu, Huang Long-Chiu, Su Yu-Chun, Chang Shih-Hsien
Department of Public Health, Chung-Shan Medical University, Taichung, 402 Taiwan, ROC.
Chemosphere. 2008 May;72(2):299-305. doi: 10.1016/j.chemosphere.2008.02.012. Epub 2008 Mar 21.
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 microM) with a supporting electrolyte of 2 gl(-1) NaCl at current density 277Am(-2) and pH 4. However, TOC mineralization and A(310) removal were low. Additionally, the treated solution showed high biotoxicity. RB5 at 110 microM 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, A(310), and TOC. The toxicity was also significantly reduced after 3h of solar irradiation. The results indicated that the low-cost combined process is a potential technique for rapid treatment of RB5.
采用电化学氧化与太阳光/固定化TiO₂薄膜联合工艺降解偶氮染料活性黑5（RB5）。通过费氏弧菌光抑制试验监测其毒性。在2 g l⁻¹ NaCl作为支持电解质、电流密度为277 A m⁻²且pH为4的条件下，电化学氧化能使RB5（55、110 μM）快速脱色。然而，总有机碳矿化和A₃₁₀去除率较低。此外，处理后的溶液显示出高生物毒性。110 μM的RB5显著降低了太阳光/固定化TiO₂薄膜工艺的脱色效率。电化学氧化与太阳光/固定化TiO₂联合工艺有效提高了颜色、A₃₁₀和总有机碳的去除率。太阳光照射3小时后毒性也显著降低。结果表明，这种低成本联合工艺是快速处理RB5的一种潜在技术。
