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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Effect of humic acid on TiO2 photocatalytic activity under visible light illumination by ligand-to-metal charge transfer (LMCT) via surface complex formation

2019년 9월 9일 14시 04분 26초
ENVR.P-461 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Environmental Energy
저자 및
Hyeonyeong Park, Wooyul Kim*, EunJu Kim1,*
Department of Chemical and Biological Engineering, Sookmyung Women's University, Korea
1Korea Institute of Science and Technology, Korea
The diverse applications of TiO2 can cause its exposure into natural water environment and the natural organic matter (NOM), which ubiquitously exists in natural water and soil will strongly affect behavior of TiO2 with high potential. It is important to elucidate the environmental implications caused by the reaction of TiO2 and NOM in aquatic system. This study shows that humic acid (HA) as a representative of NOM affects to photocatalytic activity of TiO2 under visible light (VL) condition through the ligand-to-metal charge transfer (LMCT) by the formation of surface charge transfer complex. The decomposition of some substrates (such as hexavalent chromate (Cr(VI)), 4-chlorophenol (4-CP)) were clearly enhanced in the system containing both HA and TiO2 compared to controls (HA only and TiO2 only), whereas that of dichloroacetate (DCA) was not degraded at all. It confirms that HA affect onto TiO2 photocatalysis under VL condition and the substrate-specific property is related with the location of the reaction occurred. The current increase of TiO2/FTO electrode with gradual addition of HA and the decrease of PL intensities of HA with increasing dose of TiO2 indicates that electrons were transferred from HA to the conduction band of TiO2. The HA-coated TiO2 (HA/TiO2) has a continuous absorption in the visible region extending over 700 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) induced by surface charge transfer complexation. Generation of diverse ROS by HA/TiO2 system under was confirmed and among the ROSs, hydrogen peroxide (H2O2) was most significantly observed. References [1] G. Zhnag, G. Kim and W. Choi, "Visible light driven photocatlaysis mediated via ligand-to-metal charge transfer (LMCT): an alternative approach to solar activation of titania", Energy Environ. Sci.,, 7, 954-966 (2014) [2] M. Long, J. Brame, F. Qin, J. Bao, Q. Li, and P Alvarez, “Phosphate Changes Effect of Humic Acids on TiO2 photocatalysis: From Inhibition to Mitigation of Electron-Hole Recombination Acknowledgement This work was conducted with the support of the Korea Environment Industry & Technology Institute (KEITI) through its Ecological Imitation-based Environmental Pollution Management Technology Development Project, and funded by the Korea Ministry of Environment (MOE) (201900123456789)