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

Authors: Sharma, Virender K.¹; Chenay, Benoit V.N.²

Source: Journal of Applied Electrochemistry, Volume 35, Number 7, July 2005 , pp. 775-781(7)

Publisher: Springer

Buy & download fulltext article:

Price: $47.00 plus tax (Refund Policy)

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

m^0.25 s and b = 4.1 × 10⁶

m^-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).

Keywords: ferrate (VI); ferrate(V); TiO2; mechanism; remediation

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10800-005-5169-8

Affiliations: 1: Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida, 32901, USA, Email: vsharma@fit.edu 2: Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida, 32901, USA,

Publication date: 2005-07-01