College of textile engineering, Taiyuan University of technology, Jinzhong, Shanxi 030600, China.
College of textile engineering, Taiyuan University of technology, Jinzhong, Shanxi 030600, China.
Int J Biol Macromol. 2019 Feb 15;123:363-368. doi: 10.1016/j.ijbiomac.2018.11.112. Epub 2018 Nov 13.
Recycling of waste cotton fabrics (WCFs) and converting them into high value-added products have not been developed. In this study, a novel and green process was developed for the preparation of microcrystalline cellulose (MCC) from WCFs by the catalytic hydrolysis of phosphotungstic acid (HPWO, HPW). The effects of hydrolysis conditions such as HPW concentration, reaction temperature, reaction time, and solid/liquid ratio were investigated. The optimum process conditions were determined as follows: HPW concentration of 3.47 mmol/L, a solid/liquid ratio of 1:40, reaction temperature of 140 °C, and reaction time of 6 h. The yield of MCC prepared was as high as 83.4% and exhibited better performance than commercial MCC such as a higher crystallinity (85.2%), smaller particle size (20.37 μm), and narrower particle size distribution (72.75%, 8.68-31.1 μm). Furthermore, the HPW could be extracted and recycled easily with diethyl ether for five times and used to prepare MCC with a high yield and crystallinity index.
废弃棉织物（WCFs）的回收利用及其转化为高附加值产品尚未得到开发。在这项研究中，通过磷钨酸（HPWO，HPW）的催化水解，开发了一种从 WCFs 制备微晶纤维素（MCC）的新颖绿色工艺。考察了水解条件如 HPW 浓度、反应温度、反应时间和固液比对水解的影响。确定了最佳的工艺条件为：HPW 浓度 3.47mmol/L，固液比 1:40，反应温度 140°C，反应时间 6h。所制备的 MCC 的产率高达 83.4%，表现出比商业 MCC 更好的性能，如更高的结晶度（85.2%）、更小的粒径（20.37μm）和更窄的粒径分布（72.75%，8.68-31.1μm）。此外，HPW 可以用乙醚轻松萃取和回收，重复使用五次，用于制备具有高产率和结晶度指数的 MCC。
