• Title/Summary/Keyword: Nano-surface Treatment

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Effective Biodegradation of Polyaromatic Hydrocarbons Through Pretreatment Using $TiO_2$-Coated Bamboo Activated Carbon and UV ($TiO_2$로 코팅된 대나무숯 및 UV의 전처리를 통한 다환방향족탄화수소의 효율적 생분해)

  • Ekpeghere, Kalu I.;Koo, Jin-Heui;Kim, Jong-Hyang;Lee, Byeong-Woo;Yi, Sam-Nyung;Kim, Yun-Hae;Koh, Sung-Cheol
    • Korean Journal of Microbiology
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    • v.47 no.2
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    • pp.137-142
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    • 2011
  • $TiO_2$-coated bamboo activated carbon has been prepared and utilized under UV irradiation as a pretreatment method for an effective biodegradation of the recalcitrant polyaromatic hydrocarbons (PAHs). The anatase $TiO_2$ was successfully coated on the bamboo activated carbon (AC) and it showed the highest photoactivity against methylene blue. In the absence of the PAHs-degrading bacteria PAHs having low molecular weight (i.e., naphthalene, acenaphthylene, acenaphthene, and fluorene) were degraded by 9.8, 76.2, 74.1, and 40.5%, respectively. Higher molecular weight PAHs, however, maintained high residual concentrations of PAHs (400-1,000 ${\mu}g$/L) after the same treatment. On the other hand, the overall concentrations of PAHs became lower than 340 ${\mu}g$/L when the pretreated PAHs were subjected to biodegradation by a PAH-degrading consortium for a week. Herein, phenanthrene, anthracene, fluoranthene, and pyrene were removed by 29.3, 61.4, 27.0, and 44.3%, respectively, indicating the facilitated potential biodegradation of PAHs. Activated carbon coated with $TiO_2$ appeared to inhibit growth of PAH degraders on the surface of AC, indicating planktonic degraders were dominantly involved in the PAH biodegradation in presence of the $TiO_2$-coated bamboo AC. It was proposed that an effective remediation technology for the recalcitrant PAHs could be developed when an optimum pretreatment process is further established.