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Braroo, A. ; Wen, Y.Z.* ; Collins, T.J.* ; Lenoir, D. ; Schramm, K.-W.

Fe-III-TAML-catalysed degradation of two azo textile dyes bound to silica gel and cellulose.

Fresen. Environ. Bull. 18, 505-510 (2009)

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Degradation of two textile dyes, C.I.Acid Orange 7 (Orange II) and C.I. Reactive Red 2 (Procion Red MX-5B) bound to silica gel and cellulose by hydrogen peroxide catalyzed by Fe (III) complexed to Tetra-Amido Macrocyclic Ligands (Fe-TAML activators) at pH 10 was investigated. The performance of the oxidising system was characterized by conducting batch and column experiments. C.I.Acid Orange 7 and C.I. Reactive Red 2 on solid matrix after the addition of the Fe-TAML/H2O2 decolourize in initial time period of 10-20 minutes. The decolourisation rate of dyes on silica gel or on cellulose respectively was much slower than that in aqueous solution. On the silica gel. the degradation mechanism is the same as observed in aqueous solutions, first step is likely the formation of reactive species and the second step is the interaction of the reactive part with the desorbed dyes structure to release various species. The finding about decolourisation of the dyed cellulose leads to the conclusion that that Fe-TAML molecules must enter into the microfibril of cellulose and approach closely to the dye. Thus, the catalyst is not able to completely degrade the dye while bound to a fabric of structure such as cellulose.

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