Photocatalytic pre-treatment with food-grade TiO2 increases the bioavailability and bioremediation potential of weathered oil from the Deepwater Horizon oil spill in the Gulf of Mexico

Jonathon A. Brame, Seok Won Hong, Jaesang Lee, Sang Hyup Lee, Pedro J.J. Alvarez

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Using the 2010 Deepwater Horizon oil spill in the Gulf of Mexico as an impetus, we explored the potential for TiO2-mediated photocatalytic reactive oxygen species (ROS) generation to increase the bioavailability (solubility) and biodegradability of weathered oil after a spill. Food grade TiO2, which is FDA approved for use as food additive in the United States, was tested as a photocatalyst for this novel application. Photocatalytic pre-treatment (0.05wt.% TiO2, UV irradiation 18Wm-2, 350-400nm) for 24h in a bench top photoreactor increased the soluble organic carbon content of weathered oil by 60%, and enhanced its subsequent biodegradation (measured as O2 consumption in a respirometer) by 37%. Photocatalytic pre-treatment was also tested outdoors under sunlight illumination, but no significant increase in solubility or biodegradation was observed after 11d of exposure. Although sunlight irradiation of food-grade TiO2 generated ROS (assessed by the degradation of 4-chlorophenol as a probe compound), the efficacy of weathered oil pre-treatment was apparently hindered by sinking of the photocatalysts under quiescent conditions and illumination occlusion by the oil. Overall, results indicate that photocatalytic pre-treatment to stimulate bioremediation of weathered oil deserves further consideration, but controlling the buoyancy and surface hydrophobicity of the photocatalysts will be important for future efforts to enable ROS generation in proximity to the target compounds.

Original languageEnglish
Pages (from-to)2315-2319
Number of pages5
JournalChemosphere
Volume90
Issue number8
DOIs
Publication statusPublished - 2013 Feb

Keywords

  • Biodegradation
  • Bioremediation
  • Oil
  • Photocatalyst
  • Recalcitrant
  • Remediation

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Fingerprint Dive into the research topics of 'Photocatalytic pre-treatment with food-grade TiO<sub>2</sub> increases the bioavailability and bioremediation potential of weathered oil from the Deepwater Horizon oil spill in the Gulf of Mexico'. Together they form a unique fingerprint.

  • Cite this