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Kinetic and spectroscopic study of heterogeneous oxidation of azo dyes using hypochlorite

Kinetic and spectroscopic study of heterogeneous oxidation of azo dyes using hypochlorite
Kinetic and spectroscopic study of heterogeneous oxidation of azo dyes using hypochlorite
A combined kinetic and spectroscopic investigation is described of the heterogeneous oxidation (by hypochlorite) of an azo dye (Remazol Red RB) reactively bound to cotton. It is shown that the physical state of bound dye (e.g. its pK(A) and tautomeric form) and its oxidation profile with pH are similar to those or dye in homogeneous solution. Analyses are presented which suggest that the mechanism of oxidation in the two environments is similar. The oxidation of azo dyes of pyrazolone and pyridone types occurs at similar rates to arylazonaphthol dyes. This suggests that oxidation kinetics are independent of groups attached either side of the azo linkage, confirming that the site of attack is the more nucleophilic nitrogen atom of the azo group of the common anion.
76-81
Oakes, J.
337bb2e4-84f3-45ed-918f-886d71b65ac7
Gratton, P.
9be90999-cadd-4bd9-bb4f-abebb8bc829e
Wilkes, I.
8b01e4c7-6536-4e6a-b072-b4dbcb26c1ca
Gordon-Smith, T.
743dc5e2-1ec3-436f-b223-8712244a4641
Oakes, J.
337bb2e4-84f3-45ed-918f-886d71b65ac7
Gratton, P.
9be90999-cadd-4bd9-bb4f-abebb8bc829e
Wilkes, I.
8b01e4c7-6536-4e6a-b072-b4dbcb26c1ca
Gordon-Smith, T.
743dc5e2-1ec3-436f-b223-8712244a4641

Oakes, J., Gratton, P., Wilkes, I. and Gordon-Smith, T. (2001) Kinetic and spectroscopic study of heterogeneous oxidation of azo dyes using hypochlorite. Coloration Technology, 117 (2), 76-81.

Record type: Article

Abstract

A combined kinetic and spectroscopic investigation is described of the heterogeneous oxidation (by hypochlorite) of an azo dye (Remazol Red RB) reactively bound to cotton. It is shown that the physical state of bound dye (e.g. its pK(A) and tautomeric form) and its oxidation profile with pH are similar to those or dye in homogeneous solution. Analyses are presented which suggest that the mechanism of oxidation in the two environments is similar. The oxidation of azo dyes of pyrazolone and pyridone types occurs at similar rates to arylazonaphthol dyes. This suggests that oxidation kinetics are independent of groups attached either side of the azo linkage, confirming that the site of attack is the more nucleophilic nitrogen atom of the azo group of the common anion.

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Published date: 2001

Identifiers

Local EPrints ID: 19582
URI: http://eprints.soton.ac.uk/id/eprint/19582
PURE UUID: 70e674db-7566-4771-9aac-40fa8bd0c376

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Date deposited: 14 Feb 2006
Last modified: 15 Jul 2019 19:27

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