| Title |
A Study on the Removal of Heavy Metal-EDTA in Water By Using a Solar Light / TiO2 System |
| Authors |
조일형(Il Hyoung Cho),김현용(Hyun Yong Kim),성기석(Gi Seok Sung),박경렬(Kyung Yeul Park),이홍근(Hong Keun Lee) |
| Abstract |
The removal of heavy metal and EDTA was done by a solar photocatalytic oxidation and reduction. EDTA is industrial agent to form stable heavy metal-EDTA complex with toxic metals such as Cr(VI), Ni(II), Zn(II). Hg(II). Cu (II). Cd(II). In this experiment, comparison solar photolysis. TiO₂ adsorption, and solar/TiO₂ photocatalysis as well as the effect of reaction conditions such as solar light intensity, TiO₂ dosage and H₂O₂ concentration on the removal of heavy metal-EDTA were done in a tubular type reactor. The results of this study were as follows: 1) With both solar light and TiO₂ present, heavy metal-EDTA was more effectively removed than either solar light or TiO₂ alone. It was found that solar light application to the photocatalytic oxidation and reduction of heavy metal-EDTA was possible. 2) Photocatalytic removal efficiency of heavy metal-EDTA increased with solar light intensity. 3) Photocatalytic removal efficiency of heavy metal-EDTA increased with TiO₂ dosage. However, the efficiency approached to a saturation level over 1.5g/L of TiO₂ dosage. 4) Addition of H₂O₂ enhanced the efficiency of photocatalytic oxidation and reduction of the heavy metal-EDTA but the removal efficiency was similar or decreased over some level of H₂O₂ concentration. |