AI Article Synopsis
- The study explored a combination of electrochemical oxidation and solar-light/immobilized TiO2 film processes to degrade the azo dye Reactive Black 5 (RB5) while also assessing its toxicity using Vibrio fischeri.
- Electrochemical oxidation alone was effective in decolorizing RB5 but showed low total organic carbon (TOC) mineralization and increased biotoxicity, especially at higher dye concentrations.
- Combining both treatments enhanced color and TOC removal, and solar irradiation significantly reduced toxicity after 3 hours, indicating this cost-effective method could be a viable option for rapidly treating RB5 waste.
Article Abstract
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.
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| http://dx.doi.org/10.1016/j.chemosphere.2008.02.012 | DOI Listing |
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