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Ultrasound aided KMnO4-acid systems for bleaching linen fabric

Authors
Journal
Carbohydrate Polymers
0144-8617
Publisher
Elsevier
Publication Date
Volume
83
Issue
3
Identifiers
DOI: 10.1016/j.carbpol.2010.09.052
Keywords
  • Potassium Permanganate
  • Oxalic Acid
  • Citric Acid
  • Ultrasound
  • Linen Fabric
  • Hydrogen Peroxide
  • Technical Properties

Abstract

Abstract Investigations were undertaken to optimize bleaching of linen fabrics using four systems, namely, KMnO 4-oxalic acid, KMnO 4-citric acid, ultrasound assisted KMnO 4-oxalic acid and ultrasound assisted KMnO 4-citric acid .The bleaching process involved two distinct steps where linen fabric was treated under different conditions with aqueous solutions of KMnO 4 to yield MnO 2-containing fabrics then the latter in a subsequent step was subjected to acid treatment under a variety of conditions. Optimization studies concerning the KMnO4 treatment refer to the following conditions. [KMnO4], 5 g/l at pH 4 and 90 °C for 20 min, whereas those of acid treatment were [oxalic acid], 10 g/l at 85 °C for 30 min. Similar conditions were found with citric acid except that its concentrations was 8 g/l. Introduction of ultrasound as an eco-friendly source of energy in the acid treatment step shortens the time from 30 min to 5 and 10 min in case of oxalic acid and citric acid respectively while decreasing the temperature from 85 °C to 60 °C for both acids.

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