Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Effect of Pretreatment of Biogenic Titanium Dioxide on Photocatalytic Transformation of Chloroform

Biogenic TiO2 나노입자 전처리가 클로로포름 광분해에 미치는 영향

  • Kwon, Sooyoul (Department of Environmental Health, Korea National Open University) ;
  • Rorrer, Greg (School of Chemical, Biological & Environmental Engineering, Oregon State University, USA) ;
  • Semprini, Lewis (School of Chemical, Biological & Environmental Engineering, Oregon State University, USA) ;
  • Kim, Young (Department of Environmental Engineering, Korea University)
  • 권수열 (한국방송통신대학교 환경보건학과) ;
  • ;
  • ;
  • 김영 (고려대학교 환경시스템공학과)
  • Received : 2010.12.14
  • Accepted : 2010.12.29
  • Published : 2011.01.30
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Abstract

Photocatalysis using UV light and catalysts is an attractive low temperature and non-energy- intensive method for remediation of a wide range of chemical contaminants like chloroform (CF). Recently development of environmental friendly and sustainable catalytic systems is needed before such catalysts can be routinely applied to large-scale remediation or drinking water treatment. Titanium dioxide is a candidate material, since it is stable, highly reactive, and inexpensive. Diatoms are photosynthetic, single-celled algae that make a microscale silica shell with nano scale features. These diatoms have an ability to biologically fabricate $TiO_2$ nanoparticles into this shell in a process that parallels nanoscale silica mineralization. We cultivated diatoms, metabolically deposited titanium into the shell by using a two-stage photobioreactor and used this biogenic $TiO_2$ to this study. In this study we evaluated how effectively biogenic $TiO_2$ nanoparticles transform CF compared with chemically-synthesized $TiO_2$ nanoparticlesthe and effect of pretreatment of diatom-produced $TiO_2$ nanoparticles on photocatalytic transformation of CF. The rate of CF transformation by diatom-$TiO_2$ particles is a factor of 3 slower than chemically-synthesized one and chloride ion production was also co-related with CF transformation, and 79~91% of CF mineralization was observed in two $TiO_2$ particles. And the period of sonication and mass transfer due to particle size, evaluated by difference of oxygen tention does not affect on the CF transformation. Based on the XRD analysis we conclude that slower CF transformation by diatom-$TiO_2$ might be due to incomplete annealing to the anatase form.

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References

  1. Choi, W. and Hoffman, M. R. (1997). Novel photocatalytic mechanisms for $CHCl_{3}$, $CHBr_{3}$, and $CCl_{3}CO_{2}$ - degradation and the fate of photogenerated trihalomethyl radicals on $TiO_{2}$. Environ. Sci. Technol., 31, pp. 89-85. https://doi.org/10.1021/es960157k
  2. Crawford, S., Higgins, M. J., Mulvaney, P., and Wetherbee, R. (2001). Nanostructure of the diatom frustule as revealed by atomic force and scanning electron spectroscopy. J. Phycol., 27, pp. 543-554.
  3. Hildebrand, M. (2000). Silicic acid transport and its control during cell wall silicification in diatoms. In: Biomineralization: From Biotechnology to Medical Application, E. Baeuerlein (ed.), Wiley-VCH Weinheim, pp. 171-188.
  4. Hoffmann, M. R., Martin, S. T., Choi, W., and Bahnemann, D. W. (1995). Environmental applications of semiconductors catalysts. Chem. Rev., 95, pp. 69-96. https://doi.org/10.1021/cr00033a004
  5. Huang, Y. M. and Rorrer, G. L. (2002). Dynamic of oxygen evolution and biomass production during cultivation of Agardhiella subulata microplantlets in bubble-column photobioreactor under medium perfusion. Biotechnology Progress, 18, pp. 62-71. https://doi.org/10.1021/bp010149u
  6. Jeffryes, C. and Rorrer, G. L. (2008). Metabolic insertion of nanostructured $TiO_{2}$ into diatom biosilica by a two-stage bioreactor cultivation process. ACS Nano, 2, pp. 2103-2112. https://doi.org/10.1021/nn800470x
  7. Squillance, P. J., Moran, M. J., Lapham, W. W., Price, C. V., Clawges, R. M., and Zogorski, J. S. (1999). Volatile organic compounds in untreated ambient groundwater of the United States, 1985-1995. Environ. Sci. Technol., 33, pp. 4176-4187. https://doi.org/10.1021/es990234m