Low-temperature bleaching of cotton knitting fabric with H₂O₂/PAG system

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• 作者：Kai Liu ; Xuan Zhang ; Kelu Yan
• 关键词：Cotton fabric ; Hydroxide peroxide bleaching ; Pentaacetyl glucose ; Low temperature
• 刊名：Cellulose
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：24
• 期：3
• 页码：1555-1561
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Bioorganic Chemistry; Physical Chemistry; Organic Chemistry; Polymer Sciences;
• 出版者：Springer Netherlands
• ISSN：1572-882X
• 卷排序：24

文摘

Pentaacetyl glucose (PAG) is a common and cheap intermediate and has biocompatible, nontoxic, and renewable features. PAG was investigated as a bleach activator for H₂O₂ in the pretreatment of gray knitting cotton fabric. The bleaching performance of the H₂O₂/PAG bleaching system was investigated by measuring the CIE whiteness index (WI), H₂O₂ decomposition rate and bursting strength. By addition of PAG, the WI and H₂O₂ decomposition rate increased significantly at 70 °C with little damage to the strength. The effects of temperature and pH value on WI were also considered. Due to its environmental advantages, the H₂O₂/PAG system showed a good applied prospect. By using benzenepentacarboxylic acid as a fluorescent probe for HO· detection, it was found that PAG could strongly promote HO· generation and that the concentration of HO· was closely related to the WI of the fabric. On this basis, a bleaching mechanism of the H₂O₂/PAG system was proposed.