Sharma Rajeev Kr, Kumar Rajesh, Singh Anirudh P
Department of Chemistry, Dayanand Anglo Vedic (DAV) College, Mahatma Hans Raj Marg, Dayanand Nagar, Jalandhar 144008, Punjab, India.
I. K. Gujral Punjab Technical University, Kapurthala-Jalandhar Highway, Kapurthala 144601, Punjab, India.
J Nanosci Nanotechnol. 2018 May 1;18(5):3702-3708. doi: 10.1166/jnn.2018.14676.
Herein, we report a greener, total chlorine free, ultrasonic physicochemical process of extraction and purification of cellulose micro-whiskers from rice husk. The initial step involves the treatment of the rice husk with a concentrated aqueous alkali solution for the duration of 6 h at 80 °C in round bottom flask in order to completely dissolve lignin and silica. After alkali pretreatment, the product obtained was thoroughly washed with distilled water, filtered and dried. The dried product was subjected to mechanical treatment followed by a bleaching process. A sonolytic technique was applied for the bleaching of rice husk using Na2O2/H2O2 as a chlorine-free bleaching agent. The detailed mechanism for the ultrasonic physicochemical bleaching of extracted cellulose from rice husk was also proposed. Extracted and bleached cellulose was characterized for morphological, compositional and thermal properties through different characterization techniques.
在此，我们报道了一种更环保、完全无氯的从稻壳中提取和纯化纤维素微纤丝的超声物理化学过程。初始步骤包括在圆底烧瓶中，于80℃下用浓碱水溶液处理稻壳6小时，以完全溶解木质素和二氧化硅。碱预处理后，将所得产物用蒸馏水彻底洗涤、过滤并干燥。干燥后的产物先进行机械处理，然后进行漂白处理。采用声解技术，以Na2O2/H2O2作为无氯漂白剂对稻壳进行漂白。还提出了从稻壳中提取的纤维素超声物理化学漂白的详细机理。通过不同的表征技术对提取和漂白后的纤维素的形态、组成和热性能进行了表征。
