title: Photodegradation of selected PCBs in the presence of Nano-TiO2 as catalyst and H2O2 as an oxidant.
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.
authors.affiliation: Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, MS 39217, USA. samy_12345@yahoo.com
authors.forename: Samuel S R
authors.initials: SS
authors.lastname: Dasary
authors.forename: Julia
authors.initials: J
authors.lastname: Saloni
authors.forename: Amanda
authors.initials: A
authors.lastname: Fletcher
authors.forename: Yerramilli
authors.initials: Y
authors.lastname: Anjaneyulu
authors.forename: Hongtao
authors.initials: H
authors.lastname: Yu
mesh_terms: D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D006207:Half-Life; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D036103:Nanotechnology; D016877:Oxidants / Q000737:chemistry*; D010777:Photochemistry; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D016877:Oxidants; C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium; D011078:Polychlorinated Biphenyls