Issue 7, 2024

Halogen-free bleaching of shellac using electrochemically generated peroxodicarbonate

Abstract

Industrial bleaching of shellac with sodium hypochlorite causes bleaching damages, such as double bond chlorination. Peroxodicarbonate, generated from the anodic oxidation of carbonates, acts as peroxide source for a novel acetonitrile mediated bleaching protocol, applicable on shellac. Only 6 and 9 mmol gshellac−1 of peroxodicarbonate and acetonitrile, respectively, is required to bleach shellac at room temperature with a bleaching efficiency of 94% and an acid value of 109. Furthermore, this method was demonstrated on unprocessed seedlac where the ionic strength of the peroxodicarbonate buffer facilitates dewaxing. A decreased aldehyde and acetal quantity, as well as ester hydrolysis are the major bleaching damages, visualised by FT-IR and NMR spectroscopy.

Graphical abstract: Halogen-free bleaching of shellac using electrochemically generated peroxodicarbonate

Supplementary files

Article information

Article type
Paper
Submitted
11 máj 2024
Accepted
05 jún 2024
First published
06 jún 2024
This article is Open Access
Creative Commons BY license

RSC Sustain., 2024,2, 1963-1968

Halogen-free bleaching of shellac using electrochemically generated peroxodicarbonate

T. Horsten and S. R. Waldvogel, RSC Sustain., 2024, 2, 1963 DOI: 10.1039/D4SU00228H

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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