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Research Papers

Photocatalytic Degradation of Dibutyl Phthalate: Effect of Catalyst Immobilization

[+] Author and Article Information
O. Bajt

National Institute of Biology, Marine Biology Station, Fornace 41, 6330 Piran, Slovenia

J. Zita1

Department of Inorganic Technology, Institute of Chemical Technology, Prague Technická 5, 16628 Prague, Czech Republicjiri.zita@vscht.cz

P. Novotná

Department of Inorganic Technology, Institute of Chemical Technology, Prague Technická 5, 16628 Prague, Czech Republic

J. Krýsa1

Department of Inorganic Technology, Institute of Chemical Technology, Prague Technická 5, 16628 Prague, Czech RepublicJosef.krysa@vscht.cz

J. Jirkovský

J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 5, 18200 Prague, Czech Republic

1

Corresponding authors.

J. Sol. Energy Eng 130(4), 041005 (Sep 05, 2008) (5 pages) doi:10.1115/1.2969802 History: Received November 13, 2007; Revised December 07, 2007; Published September 05, 2008

The degradation processes of dibutyl phthalate (DBP), an important pollutant, are rather slow and do not lead to the complete decomposition. In the present work the photocatalytic degradation of dibutyl phthalate in the presence of TiO2 was studied. Experiments were carried out in suspensions and with immobilized layers, prepared from powder suspensions and by sol-gel technique. Two different polychromatic light sources (band maxima at 350nm and 365nm) were used for irradiation. The results confirmed that the photocatalytic degradation of DBP using TiO2 is an efficient degradation process and proceeds even at very low concentration of photocatalyst (0.001gdm3). Reaction rates were significantly higher in the case of the lamp with the maximum at 365nm, which is due to the higher light intensity of this lamp. At comparable TiO2 amount P25 layers exhibit about 50% of photoactivity using TiO2 suspension.

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Figures

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Figure 8

Scanning electron microscopy (SEM) morphology of immobilized TiO2 layers: sol-gel (left) and particulate (right)

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Figure 7

Comparison of the rate constant related to the amount of photocatalyst for P25 and sol-gel layers

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Figure 6

Comparison of the rate constants of photocatalytic degradation of DBP in suspension and in immobilized form

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Figure 5

Comparison of the efficiency of two different lamps

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Figure 4

Degradation of DBP in TiO2 suspension at different TiO2 concentrations, BLB lamp

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Figure 3

Emission spectra of lamps applied in this study

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Figure 2

Experimental apparatus—top view

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Figure 1

Simplified reaction scheme for DBP photocatalytic degradation on TiO2

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