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09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Effect of humic acid on TiO
photocatalytic activity under visible light illumination by ligand-to-metal charge transfer (LMCT) via surface complex formation
2019년 9월 9일 14시 04분 26초
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10월 17일 (목요일) 11:00~12:30
, Wooyul Kim
, EunJu Kim
Department of Chemical and Biological Engineering, Sookmyung Women's University, Korea
Korea Institute of Science and Technology, Korea
The diverse applications of TiO
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 TiO
with high potential. It is important to elucidate the environmental implications caused by the reaction of TiO
and NOM in aquatic system. This study shows that humic acid (HA) as a representative of NOM affects to photocatalytic activity of TiO
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 TiO
compared to controls (HA only and TiO
only), whereas that of dichloroacetate (DCA) was not degraded at all. It confirms that HA affect onto TiO
photocatalysis under VL condition and the substrate-specific property is related with the location of the reaction occurred. The current increase of TiO
/FTO electrode with gradual addition of HA and the decrease of PL intensities of HA with increasing dose of TiO
indicates that electrons were transferred from HA to the conduction band of TiO
. The HA-coated TiO
) has a continuous absorption in the visible region extending over 700 nm that is not observed in HA or TiO
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/TiO
system under was confirmed and among the ROSs, hydrogen peroxide (H
) was most significantly observed. References  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)  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)
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