首页|Effects of iron species on the photocatalytic degradation of an azo dye in TiO_2 aqueous suspensions
Effects of iron species on the photocatalytic degradation of an azo dye in TiO_2 aqueous suspensions
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The effects of Fe(III) species on the photocatalytic degradation of azo dye Acid Red 1 (AR1) have been studied in titanium dioxide aqueous suspensions under irradiation in the 315-400 nm range.The initial increase of the photocatalytic degradation rate observed in water suspensions containing Fe(III) aquo ions (10~(-5) to 10~(-4) M) was attributed to the increased amount of dye adsorbed on the iron(III)-modified semiconductor surface.The mineralisation kinertic profiles obtained under simultaneous sonication further confirmed the role of AR1 adsorption.The accumulation of hydrogen peroxide during the photocatalytic degradation of the dye was completely suppressed in the presence of all iron species,mainly due to the Fenton reactions consuming H_2O_2in the aqueous phase,although a decrease in the rate of H_2O_2 formation cannot be excluded,due to the competition between adsorbed Fe(III) species and adsorbed oxygen for photo-promoted conduction band electrons.
photocatalytic degradationtitanium dioxideFe(III) adsorptionAcid Red 1
Marta Mrowetz、Elena Selli
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Dipartimento di Chimica Fisica ed Elettrochimica,Universita di Milano,Via Golgi 19,I-20133 Milan,Italy
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