123rd General Meeting of the KCS

Type Oral Presentation
Area Student Oral Presentation
Room No. Room 203
Time THU 10:30-10:45
Code ENVR.O-7
Subject Phase dependent OH radical Generation Mechanism: Anatase vs. Rutile TiO2
Authors Ji Young Hwang, Wooyul Kim1,*
Department of Chemical and Biological Engineering, Sookmyung women's university, Korea
1Department of Chemical and Biological Engineering, Sookmyung Women's University, Korea
Abstract TiO2 as a photocatalyst is a widely investigated for very diverse applications because it is eco-friendly and inexpensive. Although intensive research has been reported, the complete understanding of photocatalytic phenomenom and mechanisms of mobile hydroxyl radical generation is still far away. In this study, selective generation of mobile hydroxyl radicals on anatase of TiO2 was confirmed using tetramethylammonium (TMA) in acidic condition, but its decomposition was negligible on the rutile phase. The pH-dependent electrostatic interactions cause the surface trapped holes to participate in the oxidation of TMA by adsorbing TMA to anatase and rutile in base condition by changing the decomposition behavior of TMA. Thus, the trend selectively distinguishes a surface trapping holes and a mobile hydroxy radical derived from photocatalysis. The direct evidence gathered from various spectroscopic and photocatalytic TMA decomposition results will help to reveal the controversial mechanism mediating hydroxyl radicals, raised in diverse advanced oxidation processes.
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