Photocatalytic ozonation of dibutyl phthalate over TiO2 film

Abstract A novel carbon black modified nano-TiO2 film photocatalyst (CB-TiO2) was prepared by a sol–gel method and used for degrading and mineralizing dibutyl phthalate. The film was characterized by XRD, SEM, and DRS techniques. Carbon black modification could make TiO2 film more pores, looser structure, smaller crystal sizes and longer excitation wavelength. The photocatalytic activity of the CB-TiO2 films was 1.4 times higher than that of TiO2 films in degrading dibutyl phthalate. The results showed that ozone concentrations had an important effect on degradation and mineralization of dibutyl phthalate. The combined photocatalysis with UV irradiation and ozonation (TiO2/UV/O3) process considerably improved mineralization and degradation of dibutyl phthalate compared to combined photocatalysis with UV irradiation (TiO2/UV) process, combined ozonation with UV irradiation (UV/O3) process and ozonation alone (O3) process. Dibutyl phthalate can be quickly mineralized in TiO2/UV/O3 and UV/O3, its mineralization followed pseudo-zero-order kinetics dependent upon ozone concentration and indicated its concentration did not affect the kinetics during TiO2/UV, UV/O3 and TiO2/UV/O3 processes. The kinetic study showed the mineralization rate constants of dibutyl phthalate with TiO2/UV/O3 are 1.2–1.8 times higher than that of UV/O3 with the same ozone concentration and 3.5 times higher than that of TiO2/UV.

[1]  R. W. Matthews,et al.  Photocatalytic oxidation of organic contaminants in water: An aid to environmental preservation , 1992 .

[2]  R. Bauer,et al.  Degradation of nitrogen containing organic compounds by combined photocatalysis and ozonation. , 1999, Chemosphere.

[3]  J. Kallas,et al.  Advanced Oxidation Processes Against Phenolic Compounds In Wastewater Treatment , 1995 .

[4]  G. Mailhot,et al.  Degradation of dibutyl phthalate by homogeneous photocatalysis with Fe(III) in aqueous solution , 2001 .

[5]  D. Bahnemann,et al.  Titanium dioxide mediated photocatalytic degradation of 1,2-diethyl phthalate , 2001 .

[6]  J. Tiedje,et al.  Anaerobic biodegradation of phthalic acid esters in sludge. , 1984, Environmental science & technology.

[7]  Qiang Zhang,et al.  Effects of calcination on the photocatalytic properties of nanosized TiO2 powders prepared by TiCl4 hydrolysis , 2000 .

[8]  P. Howard,et al.  Activated Sludge Biodegradation of 12 Commercial Phthalate Esters , 1985, Applied and environmental microbiology.

[9]  Reinhard Niessner,et al.  TOC-removal and degradation of pollutants in leachate using a thin-film photoreactor , 1999 .

[10]  A. Beenackers,et al.  Experimental comparison of three reactor designs for photocatalytic water purification , 2001 .

[11]  H. Yoshida,et al.  Degradation of Dibutyl Phthalate in Water by the Aid of Metals under γ-Ray Irradiation , 2001 .

[12]  Jianlong Wang,et al.  Biodegradation of phthalic acid esters by acclimated activated sludge , 1996 .

[13]  Dennis R. Peterson,et al.  The environmental fate of phthalate esters: A literature review , 1997 .

[14]  P. Roche,et al.  Hydroxyl Radical Oxidation Processes For The Removal Of Triazine From Natural Water , 1995 .

[15]  R. Gracia,et al.  TiO2-CATALYSED OZONATION OF RAW EBRO RIVER WATER , 2000 .

[16]  M. Anderson,et al.  Photocatalytic degradation of ethylene over thin films of titania supported on glass rings , 1999 .

[17]  Y. Ichikawa,et al.  Effects of dibutyl phthalate as an environmental endocrine disruptor on gonadal sex differentiation of genetic males of the frog Rana rugosa. , 2000, Environmental health perspectives.

[18]  Patrik Kopf,et al.  TiO2 photocatalytic oxidation of monochloroacetic acid and pyridine: influence of ozone , 2000 .

[19]  I. Mazzarino,et al.  Photocatalytic Oxidation of Organic Acids in Aqueous Media by a Supported Catalyst , 1999 .

[20]  N. Durán,et al.  Degradation and toxicity reduction of textile effluent by combined photocatalytic and ozonation processes. , 2000, Chemosphere.

[21]  B. Legube,et al.  Comparative Efficiency Of Three Systems (O3, O3/H2O2, and O3/TiO2) For The Oxidation Of Natural Organic Matter In Water , 1993 .

[22]  B. Ohtani,et al.  Catalytic and photocatalytic decomposition of ozone at room temperature over titanium(IV) oxide , 1992 .