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Analytical Methods of Hydroxyl Radical Produced by TiO2 Photo-catalytic Oxidation
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 Title & Authors
Analytical Methods of Hydroxyl Radical Produced by TiO2 Photo-catalytic Oxidation
Kim, Seong Hee; Lee, Sang-Woo; Kim, Jeong Jin; Kim, Soon-Oh;
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 Abstract
The performance of photo-catalytic oxidation process is significantly dependent on the amount of hydroxyl radicals produced during the process, and it is an essential prerequisite to quantify its production. However, precise and accurate methods for quantification of hydroxyl radicals have not been developed so far. For this reason, this study was initiated to compare existing methods for analysis of hydroxyl radicals produced by photo-catalytic oxidation and to propose a new method to overcome the limitation of established methods. To simulate photo-catalytic oxidation process, Degussa P25 which has been widely used as a standard photo-catalyst was used with the dose of 0.05 g/L. The light source of process was UVC mercury low-pressure lamp (11 W, ). The results indicate that both potassium iodide (KI)/UV-vis spectrometer and terephthalic acid (TPA)/fluorescence spectrometer methods could be applied to qualitatively measure hydroxyl radicals via detection of triiodide ion () and 2-hydroxyterephthalic acid which are produced by reactions of iodine ion () and TPA with hydroxyl radicals, respectively. However, it was possible to quantitatively measure hydroxyl radicals using TPA method coupled with high-performance liquid chromatograph (HPLC). The analytical results using TPA/HPLC method show that hydroxyl radical of 0.013 M was produced after 8 hours operation of photo-catalytic oxidation under specific experimental conditions of this study. The proposed method is expected to contribute to precise the evaluation of the performance of photo-catalytic oxidation process.
 Keywords
;photo-catalytic oxidation;hydroxyl radical;potassium iodide;terephthalic acid;
 Language
Korean
 Cited by
 References
1.
Asakura, Y., Nishida, T., Matsuoka, T., and Koda, S. (2008) Effects of ultrasonic frequency and liquid height on sonochemical efficiency of large-scale sonochemical reactors. Ultrasonics Sonochemistry, 15, 244-250. crossref(new window)

2.
Choi, W.Y. (2003) Studies of TiO2 photocatalytic reactions. Journal of Korean Soceity of Industrial and Engineering Chemistry, 14, 1011-1022 (in Korean with English abstract).

3.
Fujishima, A., Rao, T.N., and Tryk, D.A. (2000) Titanium dioxide photocatalysis. Photochemistry Photobiology C: Photochemistry Reviews, 1, 1-21.

4.
Gurley, T.W. (1980) Determination of terephthalic acid at the low parts-per-billion level by reverse phase high performance liquid chromatography. Chromatographic Science, 18, 39-41. crossref(new window)

5.
Guyer, G.T. and Ince, N.H. (2004) Individual and combined effects of ultrasound, ozone and UV irradiation: a case study with textile dyes. Ultrasonics, 42, 603-609. crossref(new window)

6.
Ishibashi, K., Fujishima, A., Watanabe, T., and Hashimoto, K. (2000) Detection of active oxidative species in TiO2 photocatalysis using the fluorescence technique. Electrochemistry Communications, 2, 207-210. crossref(new window)

7.
Jackson, L.S., Carslaw, N., Carslaw, D.C., and Emmerson, K.M. (2009) Modelling trends in OH radical concentrations using generalized additive models. Atmospheric Chemistry and Physics, 9, 2021-2033. crossref(new window)

8.
Kim, J.H., Son, Y.K., Lim, M.H., Mingcan, C., Park, B.K., Kim, H.J., and Jo, E.J. (2009) Optimization of advanced oxidation process (AOP) using ultrasonic waves: Development and application of ultrasonic reactor with consideration of energy efficiency and distribution. Project Report of Korean Ministry of Environment (in Korean with English abstract).

9.
Koda, S., Kimura, T., Kondo, T., and Mitome, H. (2003) A standard method to calibrate sonochemical efficiency of an individual reaction system. Ultrasonics Sonochemistry, 10, 149-156. crossref(new window)

10.
Kolar, J., Strlic, M., and Pihlar, B. (2001) New colourimetric method for determination of hydroxyl radicals during ageing of cellulose. Analytica Chimica Acta, 431, 313-319. crossref(new window)

11.
Na, S.-M., Cai, J., Shin, D.-H., Cui, M., and Khim, J.-H. (2012) The study of DEP degradation properties by combination US and UV lamp of different wavelength. Journal of the Environmental Sciences, 21, 845-853 (in Korean with English abstract). crossref(new window)

12.
Nam, S.G., Hwang, A.N., Cho, S.H., Lim, M.H., and Kim, J.H. (2011) Evaluation of hydroxyl radical formation and energy distribution in photolysis reactor. Journal of Korean Society of Hazard Mitigation, 11, 179-183 (in Korean with English abstract).

13.
Shie, J.L., Lee, C.H. Chiou, C.S., Chang, C.T., Chang, C.C., and Chang, C.Y. (2008) Photodegradation kinetics of formaldehyde using light sources of UVA, UVC and UVLED in the presence of composed silver titanium oxide photocatalyst. Journal of Hazardous Materials, 155, 164-172. crossref(new window)

14.
Torii, T., Yasui, K., Yasuda, K., Iida, Y., Tuziuti, T., Suzuki, T., and Nakamura, M. (2004) Generation and consumption rates of OH radicals in sonochemical reactions. Research on Chemical Intermediates, 30, 713-721. crossref(new window)

15.
Xi, Y., Man-jun, Z.M., Ling-ren, K., and Lian-sheng, W. (2004) Determination of hydroxyl radicals with salicylic acid in aqueous nitrate and nitrite solutions. Journal of Environmental Science, 16, 687-689.

16.
Xiao, Q., Si, Z., Zhang, J., Xiao, C., and Tan, X. (2008) Photoinduced hydroxyl radical and photocatalytic activity of samarium-doped $TiO_2$ nanocrystalline. Journal of Hazardous Materials, 150, 62-67. crossref(new window)