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A Study on Photocatalytic Decomposition of Methylene Blue by Crystal Structures of Anatase/Rutile $TiO_2$  

Hwang, Moon-Jin (Energy Harvest-Storage Research Center, University of Ulsan)
Nguyen, Thanh Binh (Department of Chemistry, University of Ulsan)
Ryu, Kwang-Sun (Department of Chemistry, University of Ulsan)
Publication Information
Applied Chemistry for Engineering / v.23, no.2, 2012 , pp. 148-152 More about this Journal
Abstract
Anatase and anatase/rutile $TiO_2$ samples were prepared at $HNO_3$/TTIP molar ratio of 0.1, 0.5, 1.0, and 1.5 to study the effects of the physical properties of $TiO_2$ on photocatalytic decomposition of methylene blue. The physical properties of the samples were measured with XRD, SEM, TEM, BET, FT-IR, and UV-vis spectroscopy. Anatase phase was observed at $HNO_3$/TTIP of 0.1 and anatase/rutile phases were observed at $HNO_3$/TTIP of 0.5~1.5. Rutile crystal phase, mesopore size between $TiO_2$ nanoparticles, and surface OH group on $TiO_2$ sample were gradually increased with increasing the molar ratio of $HNO_3$/TTIP and the residual methylene blue concentration before UV irradiation decreased from 78.0 to 53.3%. After UV irradiation, the residual methylene blue concentrations of the samples prepared at $HNO_3$/TTIP of 0.1, 0.5, 1.0, and 1.5 were 20, 14, 11, and 23%, respectively, and the sample prepared at $HNO_3$/TTIP of 1.0 showed the best photocatalytic ability.
Keywords
photocatalyst; methylene blue; anatase; rutile; $HNO_3$;
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