title: Photocatalytic degradation of phenanthrene on soil surfaces in the presence of nanometer anatase TiO2 under UV-light.
abstract: The effect of nanometer anatase TiO2 was investigated on the photocatalytic degradation of phenanthrene on soil surfaces under a variety of conditions. After being spiked with phenanthrene, soil samples loaded with different amounts of TiO2 (0 wt.%, 1 wt.%, 2 wt.%, 3 wt.%, and 4 wt.%) were exposed to UV-light irradiation for 25 hr. The results indicated that the photocatalytic degradation of phenanthrene followed the pseudo first-order kinetics. TiO2 significantly accelerated the degradation of phenanthrene with the half-life reduced from 45.90 to 31.36 hr for TiO2 loading of 0 wt.% and 4 wt.%, respectively. In addition, the effects of H2O2, light intensity and humic acid on the degradation of phenanthrene were investigated. The degradation of phenanthrene increased with the concentration of H2O2, light intensity and the concentration of humic acids. It has been demonstrated that the photocatalytic method in the presence of nanometer anatase TiO2 was a very promising technology for the treatments of soil polluted with organic substances in the future.
authors.affiliation: College of Chemistry, Chemical Engineering and Food Safety, Bohai University, Jinzhou 121013, China. gujiali@yahoo.cn
authors.forename: Jiali
authors.initials: J
authors.lastname: Gu
authors.forename: Dianbo
authors.initials: D
authors.lastname: Dong
authors.forename: Lingxue
authors.initials: L
authors.lastname: Kong
authors.forename: Yong
authors.initials: Y
authors.lastname: Zheng
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Li
mesh_terms: D052918:Environmental Restoration and Remediation; D006358:Hot Temperature; D006812:Humic Substances; D006861:Hydrogen Peroxide / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D010616:Phenanthrenes / Q000737:chemistry* / Q000528:radiation effects; D010782:Photolysis; D012989:Soil Pollutants / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D006812:Humic Substances; D010616:Phenanthrenes; D012989:Soil Pollutants; C009495:titanium dioxide; C031181:phenanthrene; D006861:Hydrogen Peroxide; D014025:Titanium