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Heterogeneous photocatalytic reduction of Fe(VI) in UV-irradiated titania suspensions: effect of ammonia

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Abstract

Results of the heterogeneous photocatalytic reduction of Fe(VI) in UV-irradiated TiO2 suspensions in the presence of ammonia are presented. The initial rate of Fe(VI) reduction, R, may be expressed as R = k Fe(VI)[Fe(VI)]1.25 where k Fe(VI) = a[Ammonia]+b), a = 6.0 × 103 μm 0.25 s and b = 4.1 × 106 μm −1.25s−1. The rate constant, k Fe(VI), increases with the ammonia concentration. The photocatalytic oxidation of ammonia is enhanced in the presence of Fe(VI). A mechanism involving Fe(V) as a reactive intermediate is presented which explains the faster photocatalytic oxidation of ammonia in the presence of Fe(VI).

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  1. Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida, 32901, USA

    Virender K. Sharma & Benoit V.N. Chenay

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  1. Virender K. Sharma
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  2. Benoit V.N. Chenay
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Correspondence to Virender K. Sharma.

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Sharma, V., Chenay, B. Heterogeneous photocatalytic reduction of Fe(VI) in UV-irradiated titania suspensions: effect of ammonia. J Appl Electrochem 35, 775–781 (2005). https://doi.org/10.1007/s10800-005-5169-8

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