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25th Croatian meeting of chemists and chemical engineers, Poreč, 2017.
Photocatalytic degradation of phenol on the immobilized TiO2 layer
Fotokatalitička razgradnja fenola na imobiliziranom sloju TiO2
K. Babić, M. Duplančić, V. Kosar, V. Tomašić, Z. Gomzi
Department of Reaction Engineering and Catalysis, Faculty of Chemical Engineering and Technology,
Zagreb, Croatia
E-mail: [email protected]; [email protected]
The advanced oxidation processes (AOPs) are widely used in wastewater treatment to
eliminate persistent organic pollutants, which cannot be completely removed with an
conventional wastewater treatment methods (like adsorption, flocculation, air stripping,
etc). Among these advanced technologies, TiO2 heterogeneous photocatalytic oxidation with
ultraviolet (UV) irradiation source is one of the most promising [1-3].
The purpose of this work was optimization of the phenol photodegradation with
immobilized TiO2 layer using a simple photocatalytic reactor under UV irradiation. Phenol
was chosen as a model compound to degrade, since it is frequently found in various
industrial effluents and has a toxicity effect [4].
The photocatalytic TiO2 layer was prepared using chitosan [β-(1-4)-2-amino-2-deoxyD-glucose] for immobilization on glass fibre woven roving. Photocatalytic degradation was
investigated in a batch reactor of annular type with recirculation. The source of UV
irradiation (commercial 8W UV lamp; =254 nm) was placed in the central part of the
photoreactor. Intensity of the UV lamp was measured using a radiometer (UVX Radiometer
from UVP with the corresponding sensor UVX-25 for UV-C radiation). The influence of
various operating conditions, such as temperature, initial reactant concentration, pH value,
flow rate recirculation and irradiation time of the UV lamp on photodegradation of phenol
was investigated at constant amount/thickness of the photocatalytic layer. Samples from the
reactor were analyzed using HP 1090 HPLC using a 5 m, 250x4.6 mm Zorbax SB-C18 column
and diode array detector (DAD).
Several kinetic models were proposed and appropriate kinetic parameters were
estimated to determine kinetics and reaction mechanism. The results obtained in this study
have demonstrated the feasibility of the immobilized TiO2 layer as potential heterogeneous
photocatalyst for organic pollutants decontamination in the industrial wastewater.
References
[1] A.O. Ibhadon and P. Fitzpatrick, Catalysts 3 (2013) 189-218.
[2] M. N. Chang, B. Jin, C. W. K. Chow, C. Saint, Water Research 44 (2010) 2997-3027.
[3] M. A. Lazar, S. Varghese and S. S. Nair, Catalysts 2 (2012) 572-601.
[4] P. Saravanan, K. Pakshirajan and P. Saha, Journ. of Hydro-environ. Res. 3 (2009) 45 -50.