STUDY OF THE PHOTOCATALYTIC DEGRADATION OF A CATIONIC DYE IN AQUEOUS SOLUTION BY DIFFERENT TYPES OF CATALYSTS
Keywords:
Dye, Adsorption, Photocatalysis, Decolorization, TiO2, ZnOAbstract
The photocatalytic degradation of an aqueous solution of Malachite Green Oxalate (MG) has been investigated using TiO2-P25, TiO2-PC100 and ZnO as catalysts in slurry form in presence of UV lamp at λmax= 365 nm. The adsorption of MG on TiO2-P25 and ZnO catalysts was found favorable by the Langmuir approach, while Freundlich equation represents better the adsorption of MG on the TiO2-PC100 surface. The disappearance of MG by photocatalysis in presence of the three catalysts followed pseudo first-order kinetics and Langmuir- Hinshelwood model is well suited to describe the kinetics of photocatalytic disappearance of these dye The effect of the initial dye concentration, type of catalysts, addition of alcohol such as tert-butyl and solution pH on the degradation of MG in presence of TiO2-P25, TiO2-PC100 or ZnO catalysts were discussed. The ZnO catalyst is more effective than TiO2-P25 and TiO2-PC100 at different operating conditions studied. COD analysis showed a complete mineralization of the dye in a relatively short time of about 2 h for ZnO, and a reduction of 42 % and 10 % in COD for TiO2-P25 and TiO2-PC100, respectively, after 2 h of irradiation.
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JS. Dalton, PA. Janes, NG. Jones, JA. Nicholson, KR. Hallman, GC. Allen, Photocatalytic oxidation of NOx gases using TiO2: A surface spectroscopic approach, Pollut Environ 120 (2001) 415-422.
J. Herrmann, Heterogeneous photocatalysis: fundamentals and applications to the removal of various types aqueous pollutants, Catalysis Today 53 (1999) 115-129.
N. Daneshvar, D. Salari and A.R. Khataee, Photocatalytic degradation of azo dye acid red 14 in water on ZnO as an alternative catalyst to TiO2, J. Photochem. Photobiol. A: Chem. 162 (2004) 317–322. [4] AA. Khodja, T. Sehili, J. Pilichowski and P. Boule, Photocatalytic degradation of 2 phenyl-phenol on TiO2 and ZnO in aqueous suspension, J. Photochem. Photobiol. A: Chem.141 (2001) 231–239.
MA. Behnajady, N. Modirshahla and R. Hamzavi, Kinetic study on photocatalytic degradation of C.I. Acid Yellow 23 by ZnO photocatalyst, J. Hazard. Mater. B 133 (2006) 226–232.
O. Thomas, N. Mazas, La mesure de la demande chimique en oxygène dans lesmilieux faiblement pollués, Analusis 14 (1986) 300–302.
R.E. Treybal Mass Transfer Operation (third ed.)Mc Graw-Hill Book Company (1985)
I. Poulios, I. Aetopoulou, Photocatalytic degradation of the textile dye reactive orange 16 in the presence of TiO2 suspensions, Environ Technol 20 (1999) 479-487.
E. Kusvurana, A. Samilb, O. Malik Atanura, O. Erbatur. Photocatalytic degradation kinetics of di- and tri-substituted phenolic compounds in aqueous solution by TiO2/UV, Applied Catalysis B: Environmental 58 (2005) 211–216.
S. Qourzal, M. Tamimi, A. Assabbane, Y. Ait-Ichou, Photocatalytic degradation and adsorption of 2-naphthol on suspended TiO2 surface in a dynamic reactor, Journal of Colloid and Interface Science 286 (2005) 621–626.
J. Grzechulska, A.W.Morawski, Photocatalytic decomposition of azo-dye Acid Black 1 in water over modified titanium dioxide, Applied Catalysis B: Environment 36 (2002) 45–51
S.Gautam, SP. Kamble, SB. Sawant, G. Vishwas. Pangarkar. Photocatalytic degradation of 4-nitroaniline using solar and artificial UV radiation, Chemical Engineering Journal 110 (2005) 129–137.
I. Michael, E. Hapeshi, C. Michael, D. Fatta-Kassinos, Solar Fenton and solar TiO2 catalytic treatment of ofloxacin in secondary treated effluents: Evaluation of operational and
kinetic parameters, water research 44 (2010) 5450 -5462.
K. Selvam, M. Muruganandham, I. Muthuvel, M. Swaminathan, The influence of inorganic oxidants and metal ions on semiconductor sensitized photodegradation of 4-fluorophenol, Chemical Engineering Journal 128 (2007) 51–57.
HH. Huanga, D. Tseng, LC. Juang, Heterogeneous photocatalytic degradation of monochlorobenzene in water, Journal of Hazardous Materials 156 (2008) 186–193
A. Mills, S. Morris, Photomineralization of 4-chlorophenol sensitized by titanium dioxide: a study of the initial kinetics of carbon dioxide photogeneration, J. Photochem. Photobiol. A: Chemistry 71 (1993) 75-83.
B. Junny, P. Pichat, Photocatalytic degradation of an organic dye using nano titanium dioxide 55, Langmuir 7(1991) 947.
I. Langmuir, The Mechanism of the Catalytic Action of Platinum in the Reactions 2C0 + O2 = 2CO2 and 2H2 + O2 = 2H0, Trans, Faraday Soc 17(1921) 621.
RW. Matthews, The dehydrogenation of ethanol in dilute aqueous solution photosensitized by Benzophenones, J. Chem. Soc. Farad. Trans, 1 85 (1989) 1291.
H. El-ekabi., N. Serpone, Kinetic studies in Heterogeneous Photocatalysis.1. Photocatalytic Degradation of Chlorinated Phenols in Aerated Aqueous Solutions over TiO2 Supported on a Glass Matrix , J. Phys. Chem, 92 (1988) 5726.
YC. Chan, JN. Chen, LU M.C,Intermediate inhibition in the heterogeneous UV- catalysis using a TiO2 suspension system, Chemosphere 45 (2001) 29.
DC. Hurum, AG. Agrios, KA. Gray, Explaining the Enhanced photocatalytic activity of Degussa P25 mixed-phase TiO2 using EPR, Phys. Chem. B 107 (2003) 4545–4549.
M. Qamar, M. Saquib, and M. Muneer, Photocatalytic degradation of two selected dye derivatives, chromotrope 2B and amido black 10B, in aqueous suspensions of titanium dioxide. Dyes and Pigments 6(2005) 1-9
WZ. Tang, Z. Zhang, H. An, MO. Quintana and D.F.Torres,“TiO2/UV photodegradationof azo dyes in aqueous solutions”, Environ.Technol 18 (1997)1-12.
C. Kormann, DW. Bahnemann, MR. Hoffman, Photolysis of chloroform and other
organic-molecules in aqueous TiO2 suspensions, Environ.Sci.Technol. 25 (1991) 494-500.
K. Konstantinou and T. A. Albanis, “TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: kinetic and mechanistic investigations: a review,” Applied Catalysis B 49(2004).
M. Mrowetz, E. Selli, Photocatalytic degradation of formic and benzoic acids and hydrogen peroxide evolution in TiO2 and ZnO water suspensions, J. Photochem. Photobiol 180 (2006) 15–22.
