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| Type |
Oral Presentation |
| Area |
Student Oral Presentation |
| Room No. |
Room 203 |
| Time |
THU 10:15-10:30 |
| Code |
ENVR.O-6 |
| Subject |
Effect of natural organic matter on TiO2 photoocatalysis under visible light illumination via ligand-to-metal charge transfer (LMCT) |
| Authors |
Hyeonyeong Park, Wooyul Kim1,*, EunJu Kim*
Water Cycle Research Center, Korea Institute of Science and Technology, Korea
1Department of Chemical and Biological Engineering, Sookmyung Women's University, Korea
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| Abstract |
The severe interference of natural organic matter (NOM) during TiO2 photocatalysis makes its practical application difficult although TiO2 photocatalysis has been extensively studied in advanced oxidation process for water treatment system. Revealing the interaction between NOM and TiO2 is important to prevent inhibitory effect of NOM and enhance the photocatalytic efficiency of TiO2. However, most studies have focused on the interaction NOM with TiO2 under UV light conditions and relatively little is known about the role of NOM in TiO2 photocatalysis under visible light conditions.
Here, the role of humic acid (HA) in the photocatalytic activity of TiO2 under visible light condition was systematically investigated. The HA-coated TiO2 (HA/TiO2) has a continuous absorption in the visible region extending to 800 nm that is not observed in HA or TiO2 only. It is assigned to the ligand-to-metal charge transfer (LMCT) transition (HA + TiIV → HA+ + TiIII). Some substrates (4-chlorophenol and Cr(IV)) were clearly reduced in the presence of HA/TiO2 under visible irradiation while dichloroacetate was not decomposed at all. Such a substrate-specific property was related with reactive oxygen species (ROS) generated in HA/TiO2 under visible illumination. The details for ROS produced will be presented.
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| E-mail |
cahole127@gmail.com |
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123rd General Meeting of the KCS