Abstract
Photodegradation kinetics of Monuron (3-(4-chlorophenyl)-1,1-dimethylurea) in photoreactor with immobilized and suspended TiO2 photocatalyst were studied. The effect of addition of ferric or ferrous perchlorate was investigated. Whatever the concentration of Fe(III/II) added there is no significant negative effect on the photodegradation rate of pollutants. On the contrary, depending on speciation and concentration of iron salts, slight or marked acceleration of the photodegradation kinetics was observed. This positive influence was more pronounced in the case of TiO2 suspensions than for TiO2 layers. Fe(III) was generally more effective than Fe(II).
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Benkelberg H-J, Warneck P (1995) Photodecomposition of Fe(III)hydroxo and sulfato complexes in aqueous solution: wavelength dependence of OH and SO −4 quantum yields. J Phys Chem 99:5214–5221
Brezová A, Blažková A, Borošová E, Čeppan M, Fiala R (1995) The influence of dissolved metal ions on the photocatalytic degradation of phenol in aqueous TiO2 suspensions. J Mol Catal A Chem 98:109–116
Flynn CM (1984) Hydrolysis of inorganic iron(III) salts. Chem Rev 84(1):31–41. doi:10.1021/cr00059a003
Klauson D, Preis S (2005) The influence of ferrous ions on the efficiency of aqueous photocatalytic oxidation of 2-ethoxy ethanol. Int J Photoenergy 7:175–180
Klauson D, Preis S, Portjanskaja E, Kachina A, Krichevskaya M, Kallas J (2005) The influence of ferrous/ferric ions on the efficiency of photocatalytic oxidation of pollutants in groundwater. Env Technol 26:653–661
Klauson D, Preis S (2007) The influence of iron ions on the aqueous photocatalytic oxidation of deicing agents. Int J Photoenergy. doi:10.1155/2007/89359 (in press)
Litter MI (1999) Heterogeneous photocatalysis. Transition metal ions in photocatalytic systems. Appl Catal B Environ 23:89–114 doi:10.1016/S0926-3373(99)00069-7
Mazellier P, Brand N, Mailhot G, Bolte M (2000) Homogeneous photocatalysis with iron(III) in aqueous solution: influence of iron(III) speciation on the degradation rate of pollutants. Entropie 228:44–47
Měšťánková H, Mailhot G, Pilichowski J-F, Krýsa J, Jirkovský J, Bolte M (2004a) Mineralisation of Monuron photoinduced by Fe(III) in aqueous solution. Chemosphere 57(10):1307–1315. doi:10.1016/j.chemosphere.2004.08.058
Měšťánková H, Mailhot G, Jirkovský J, Krýsa J, Bolte M (2004b) Mechanistic approach of the combined (iron–TiO2) photocatalytic system for the degradation of pollutants in aqueous solution: an attempt of rationalisation. Appl Catal B Environ 57:255–263. doi:10.1016/j.apcatb.2004.11.003
Měšťánková H, Krýsa J, Jirkovský J, Mailhot G, Bolte M (2005) The influence of Fe(III) speciation on supported TiO2 efficiency: example of Monuron photocatalytic degradation. Appl Catal B Environ 58:185–191. doi:10.1016/j.apcatb.2003.09.017
Ohno T, Haga D, Fujihara K, Kaizaki K, Matsumura M (1997) Unique Effects of Fe(III) ions on photocatalytic and photoelectrochemical properties of titanium dioxide. J Phys Chem B 101:6415–6419
Sclafani A, Palmisano L, Davi E (1991) Photocatalytic degradation of phenol in aqueous polycristalline TiO2 dispersions: the influence of Fe3+, Fe2+ and Ag+ on the reaction rate. J Photochem Photobiol A Chem 56:113–123
Vamathewan V, Tse H, Rose A, Low G, McEvoy S (2001) Effects of Fe3+ and Ag+ ions on the photocatalytic degradation of sucrose in water. Catal Today 68:201–208
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Měšťánková, H., Mailhot, G., Jirkovský, J. et al. Effect of iron speciation on the photodegradation of Monuron in combined photocatalytic systems with immobilized or suspended TiO2 . Environ Chem Lett 7, 127–132 (2009). https://doi.org/10.1007/s10311-008-0145-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10311-008-0145-2