The activator/HO system is able to achieve a low-temperature and near-neutral bleaching by producing of peroxyacids through activators' perhydrolysis. In order to develop a sustainable and efficient pre-treatment process, sucrose octaacetate (SOA) as a biomass-derived activator was initially introduced in the one-step scouring and bleaching for cotton fabric. Despite the documentation of various activators, limited researches focus on the perhydrolysis pathway and bleaching mechanism of bio-based activators. Consequently, the performances of SOA/HO system were investigated by testing the color features, hydrophilicity, and tensile property of the treated fabric. Furthermore, density functional theory (DFT) and liquid chromatography-mass spectrometry (LC-MS) were employed to clarify the perhydrolysis pathway of SOA. Afterwards, a central composite design (CCD) experiment and mathematical modeling was conducted to optimize the bleaching process and analyse the factors significantly influencing the whiteness index (WI) of fabrics. Finally, the energy and water consumption as well as the life cycle assessment (LCA) of SOA/HO bleaching was discussed. Results show that the addition of SOA further increased the fabric's WI from 74.96 to 78.78. The fabric's hydrophilicity enhanced distinctly after removing cotton wax, as confirmed by X-ray photoelectron spectrometer analysis. The bleached fabric exhibited less than 5% mechanical loss and undamaged morphology owing to the moderate SOA/HO system. DFT and LC-MS analyses revealed that three acyl carbon atoms with higher atomic charge in SOA preferentially underwent perhydrolysis, resulting in the release of equal chemical equivalents of peracetic acid as the primary bleaching substance. Besides, the important role of HO· in SOA/HO bleaching was confirmed through fluorescent labeling and radical trapping experiments. The most significant factor affecting WI was temperature, followed by HO concentration, NaHCO concentration, and time. Implementing the SOA/HO system led to approximately 35.5% energy savings, 36.4% water savings, and reduced environmental impact by the LCA. Considering the overall evaluation of CCD's outcome, fabric characteristics, and environmental benefits, the WI of 80.64 which is 93% higher than greige fabric, can be achieved when utilizing the optimized parameters (82.73 mmol/L HO, 64.14 mmol/L NaHCO, a temperature of 70 °C, and a duration of 60 min).

中文翻译：

---

使用蔗糖八乙酸酯/过氧化物活化系统的棉织物可持续高效的煮练/漂白策略：机理见解、性能优化和环境效益

活化剂/H2O体系能够通过活化剂的过水解产生过氧酸来实现低温和近中性漂白。为了开发可持续、高效的预处理工艺，蔗糖八乙酸酯（SOA）作为一种生物质衍生的活化剂最初被引入棉织物的一步煮练和漂白中。尽管有各种活化剂的文献记载，但对生物基活化剂的过水解途径和漂白机制的研究有限。因此，通过测试处理过的织物的颜色特征、亲水性和拉伸性能来研究SOA/HO系统的性能。此外，采用密度泛函理论（DFT）和液相色谱-质谱（LC-MS）来阐明SOA的过水解途径。随后，通过中央复合设计（CCD）实验和数学建模来优化漂白工艺并分析显着影响织物白度指数（WI）的因素。最后，讨论了 SOA/H2O 漂白的能源和水消耗以及生命周期评估（LCA）。结果表明，SOA的添加进一步将织物的WI从74.96提高到78.78。 X射线光电子能谱分析证实，去除棉蜡后织物的亲水性明显增强。由于采用适度的 SOA/HO 体系，漂白后的织物表现出低于 5% 的机械损失和未受损的形态。 DFT 和 LC-MS 分析表明，SOA 中原子电荷较高的三个酰基碳原子优先进行过水解，导致释放出等化学当量的过乙酸作为主要漂白物质。此外，通过荧光标记和自由基捕获实验证实了HO·在SOA/HO漂白中的重要作用。影响WI最显着的因素是温度，其次是H2O浓度、NaHCO浓度和时间。实施 SOA/HO 系统可节省约 35.5% 的能源、36.4% 的水，并减少 LCA 对环境的影响。综合考虑CCD的效果、织物特性和环境效益，采用优化参数（82.73 mmol/L H2O、64.14 mmol/L NaHCO、温度70℃，时间60分钟）。