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Oxidation catalysts for stain bleaching

Jackman, Eoin 2019. Oxidation catalysts for stain bleaching. PhD Thesis, Cardiff University.
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Abstract

thesis focuses on the evaluation of precious metal nanoparticles in the application of oxygen activation for stain bleaching. The first section looks at tea stains in solution, demonstrating that colloidal metal nanoparticles can be used to discolour fruit tea solutions as an initial proof of concept. This section goes on to develop model compound oxidations to run alongside the bleaching of stained cloth samples and to give empirical data for the kinetics of stain bleaching using the catalysts prepared in this study. Catechol and gallic acid have been chosen for this purpose, as they represent the aromatic hydroxylated compounds that are found in teas and represent their chromophoric constituents. Supported metal catalysts Au, Pd, Pt, AuPt, AuPd and PdPt on titania were chosen due to the higher activity of these catalysts found compared to the unsupported catalysts as a result of tests with stained cloth samples. Sections two and three look into the use of supported and unsupported monometallic and bimetallic precious metal catalysts for stain bleaching on stained cloth samples, specifically tea stained cotton cloth samples denoted E-167. These catalysts, namely Pd, Au, Pt, AuPd, PdPt and AuPt are tested alongside the mediators TEMPO, TAED and Violuric acid for their activity. The results of the tests are compared with the problem of staining of the cloths by the catalysts themselves highlighted and attempts at decoupling this staining phenomenon discussed. It is clear that this issue would require complete abatement before commercial use could be considered for these catalysts. The latter half of the final section briefly examines the use of unsupported catalysts for dye transfer inhibition, where staining of a cloth sample isn’t of concern and so promising results are presented.

Item Type: Thesis (PhD)
Date Type: Completion
Status: Unpublished
Schools: Chemistry
Date of First Compliant Deposit: 3 June 2020
Last Modified: 03 Jun 2020 12:49
URI: http://orca.cf.ac.uk/id/eprint/132137

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