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Photodegradation of Selected PCBs in the Presence of Nano-TiO 2 as Catalyst and H 2 O 2 as an Oxidant

Author

Listed:
  • Samuel S. R. Dasary

    (Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, MS 39217, USA)

  • Julia Saloni

    (Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, MS 39217, USA)

  • Amanda Fletcher

    (Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, MS 39217, USA)

  • Yerramilli Anjaneyulu

    (Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, MS 39217, USA)

  • Hongtao Yu

    (Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, MS 39217, USA)

Abstract

Photodegradation of five strategically selected PCBs was carried out in acetonitrile/water 80:20. Quantum chemical calculations reveal that PCBs without any chlorine on ortho -positions are closer to be planar, while PCBs with at least one chlorine atoms at the ortho -positions causes the two benzene rings to be nearly perpendicular. Light-induced degradation of planar PCBs is much slower than the perpendicular ones. The use of nano-TiO 2 speeds up the degradation of the planar PCBs, but slows down the degradation of the non-planar ones. The use of H 2 O 2 speeds up the degradation of planar PCBs greatly (by >20 times), but has little effect on non-planar ones except 2,3,5,6-TCB. The relative photodegradation rate is: 2,2’,4,4’-TCB > 2,3,5,6-TCB > 2,6-DCB ≈ 3,3’,4,4’-TCB > 3,4’,5-TCB. The use of H 2 O 2 in combination with sunlight irradiation could be an efficient and “green” technology for PCB remediation.

Suggested Citation

  • Samuel S. R. Dasary & Julia Saloni & Amanda Fletcher & Yerramilli Anjaneyulu & Hongtao Yu, 2010. "Photodegradation of Selected PCBs in the Presence of Nano-TiO 2 as Catalyst and H 2 O 2 as an Oxidant," IJERPH, MDPI, vol. 7(11), pages 1-15, November.
    • Handle: RePEc:gam:jijerp:v:7:y:2010:i:11:p:3987-4001:d:10219
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    Cited by:

    1. Xianping Luo & Chunfei Chen & Jing Yang & Junyu Wang & Qun Yan & Huquan Shi & Chunying Wang, 2015. "Characterization of La/Fe/TiO 2 and Its Photocatalytic Performance in Ammonia Nitrogen Wastewater," IJERPH, MDPI, vol. 12(11), pages 1-14, November.

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