Bleach activators for HO can notably lower bleaching temperature, leading to energy savings in cotton bleaching. However, biodegradable and nontoxic bleach activators are required to further achieve eco-friendly bleaching. Acetylated starch (AS), a saccharide derivative, has emerged as a promising candidate and not yet been explored as a bleach activator for cotton bleaching process. Herein, AS was prepared, characterized and utilized as an ecofriendly bleach activator for HO in bleaching knitted cotton fabric. First, to further improve the aqueous dispersivity of the initial AS samples, AS nanospheres were fabricated via a nanoprecipitation procedure. The bleaching performance in terms of CIE whiteness index (WI) and HO decomposition rate increased significantly at 70 °C with addition of AS. Degree of substitution (DS), AS dosage, NaOH concentration and bleaching temperature were also systematically investigated. Bleaching mechanism of the HO/AS system was further confirmed and proposed by using chemical computational analysis, peracetic acid determination and fluorescence detection experiments, respectively. Therefore, this HO/AS system can be a model system to gain a general understanding of saccharide derivative-based bleach activators. This work would greatly expand the range of bleach activators for cotton bleaching.
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