再生竹纤维素中空纤维膜的制备及性能

Preparation and Properties of the Regenerated Bamboo Cellulose Hollow Fiber Membranes

关键词:  NMMO  竹纤维素  中空纤维  膜

Key Words:NMMO  bamboo cellulose  hollow fiber  membrane

摘要:采用N-甲基吗啉-N-氧化物（NMMO）为溶剂溶解竹纤维素，通过干-湿纺法制备再生竹纤维素中空纤维膜，并采用其构建的中试膜系统对饮用水进行深度处理。结果表明，中空纤维膜的结晶结构为纤维素Ⅱ型，结晶度比竹纤维素低，化学组成与竹纤维素没有明显差异。中空纤维膜热稳定性和力学性能良好，初始热分解温度为329.8℃，拉伸强度达(62.6±6.1) MPa。饮用水处理（运行90天）后，溶解性总固体（TDS）值由574 mg/L降为154 mg/L，细菌总数由35~40 cfu/mL降为20~25 cfu/mL，出水口感好，生物安全性高。

Abstract:Bamboo cellulose （BC） was dissolved by N-methylmorpholine-N-oxide （NMMO） and the regenerated bamboo cellulose （RBC） hollow fiber membrane was prepared via dry-wet spinning method. The pilot membrane system with prepared RBC hollow fiber membrane was adopted for the advanced treatment of drinking water. The results showed that the crystalline structure of the RBC hollow fiber membrane was cellulose type II， the crystallinity was lower than that of BC. The chemical composition of the RBC hollow fiber membrane was similar to that of BC and showed the excellent thermal stability and mechanical properties with initial thermal decomposition temperature of 329.8℃ and tensile strength of （62.6±6.1） MPa. After the treatment of drinking water （90 days of operation）， the TDS value decreased from 574 mg/L to 154 mg/L and the total number of bacteria from 35~40 cfu/mL to 20~25 cfu/mL； the effluent’s taste was excellent with high biological safety.