水热环境下棉纤维水解炭化机理（英文）  

Hydrolysis and carbonization mechanism of cotton fibers in subcritical water

作　　者：崔丽萍 史晟 侯文生 阎智锋 戴晋明 CUI Li-ping 1 , SHI Sheng 2 , HOU Wen-sheng 2 , YAN Zhi-feng 2 , DAN Jin-ming 2(1. Coal Chemical Institute, Taiyuan University of Technology, Taiyuan 030024, China;2. College of Textile Engineering, Taiyuan University of Technology, Taiyuan 030024, Chin)

机构地区：[1]太原理工大学煤化工研究所,山西太原030024 [2]太原理工大学轻纺工程学院,山西太原030024

出　　处：《新型炭材料》2018年第3期245-251,共7页New Carbon Materials

基　　金：国家自然科学基金(51703153);太原理工大学青年基金(1205-04020203)~~

摘　　要：为促进废旧棉纤维的综合利用,利用亚临界水处理废旧棉纤维获得了具有优良结构和性能的炭微球。结果表明,亚临界水可以破坏棉纤维的大分子结构,使其脱水炭化。棉纤维可在不同pH值的水热环境中脱水炭化,在pH=3.5时,形成粒径为0.8~3μm的球形炭,碳含量达74.99%。可能机理是高温高压的水热环境破坏了棉纤维的晶体结构,同时纤维素分子中的β-1,4糖苷键被H3O+攻击,使棉纤维水解。棉纤维在水热反应过程中,pH值越小,葡萄糖的产量越高,所得炭化产物的形貌结构越规整,产物的碳含量和热值也越高;当pH值较高时,葡萄糖的产量降低,产物呈无规则块状结构。Waste cotton fibers were used as the raw material to prepare carbon microspheres by treatment with subcritical water. Results show that the cotton fibers are hydrolyzed, dehydrated and carbonized to form carbon spheres with a graphitic structure in subcritical water with different pH values. The carbon spheres prepared at a pH value of 3.5 have particle sizes of 0.8-3 μ m and a carbon content of 74.99%. High temperature and pressure lead to the destruction of the crystal structure of the cotton fibers. The β -1,4 glycosidic linkage in a cellulose molecule is attacked by H ＋ during hydrolysis. The smaller the pH value, the higher the glucose yield in hydrolysis, and the more regular the morphology of the carbon spheres, the greater the carbon content and calorific value of the carbonized products. It is difficult to prepare spherical carbons under high pH values due to the low hydrolysis yields of glucose.

关 键 词：棉纤维 水热炭化 炭微球 回收再利用 

分 类 号：TQ127.11[化学工程—无机化工]