Degradation of Reactive Black 5 using combined electrochemical degradation-solar-light/immobilized TiO2 film process and toxicity evaluation.
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.
Wang
Kai-Sung
KS
Department of Public Health, Chung-Shan Medical University, Taichung, 402 Taiwan, ROC.
Chen
Hsueh-Yu
HY
Huang
Long-Chiu
LC
Su
Yu-Chun
YC
Chang
Shih-Hsien
SH
D048908:Aliivibrio fischeri / Q000187:drug effects; D004563:Electrochemistry; D009282:Naphthalenesulfonates / Q000737:chemistry* / Q000633:toxicity*; D010777:Photochemistry; D010782:Photolysis / Q000528:radiation effects; D013472:Sunlight; D014025:Titanium / Q000737:chemistry*
D009282:Naphthalenesulfonates; C009495:titanium dioxide; D014025:Titanium; C063421:Remazol black B