UV/H₂O₂, UV/TiO₂ 시스템에서 염료의 색도 및 COD 제거

Elimination of COD and color of dye by UV/H₂O₂, UV/TiO₂ system

The Photocatalytic decolorization and degradation of commercial dyes were studied using a batch reactor. Degussa P25 titanium dioxide and H₂O₂ were used as the photocatalyst and proved to be effective for dyes degradation when they were irradiated with UV light. The light source was a 20W low pressure mercury lamp. Three different kinds of dyes, such as direct dye(congo red), acid dye(acid black) and disperse dye(disperse blue) were tested. Extending the UV only treatment up to 120min, direct dye was decolorized to 60% and degraded to 30% as COD. On the other side, acid and disperse dyes were eliminated less than 10% as color and COD. But, color and COD were eliminated about 90% for all of the three dyes by UV/H₂O₂ system. And then the most effective decolorization was done for direct dye with 96% removal efficiency by UV/TiO₂ system at 120min 500mg/L of TiO₂.