壳聚糖超细纤维的制备及其铬离子吸附性能研究  

Preparation of Chitosan/Poly(Methacylic Acid) Superfine Fiber Mat and Application in Chromium Ion Removal

作　　者：钟少锋[1] 吉婉丽[1] 刘晓云[1] ZHONG Shao-feng;JI Wan-li;LIU Xiao-yun(Department of Jianhu,Zhejiang Industry Polytechnic College,Shaoxing 312000,China)

机构地区：[1]浙江工业职业技术学院鉴湖学院,浙江绍兴312000

出　　处：《化学试剂》2020年第3期226-231,共6页Chemical Reagents

基　　金：绍兴市科技局公益性应用研究计划基金资助项目(2015B70014);绍兴市重点创新团队资助计划基金资助项目(222709010920717004);浙江省教育厅高职高专院校省级专业带头人领军基金资助项目(lj2013131)。

摘　　要：利用静电纺丝和热交联技术,制备了良好形貌的交联壳聚糖/聚甲基丙烯酸(CS/PMAA)纤维膜,然后采用正丙醛化学改性得到改性CS/PMAA纤维膜。Cr(Ⅵ)离子吸附实验发现,铬元素浓度为6.50 mg/L时,CS/PMAA纤维膜的吸附量可以达到4.98 mg/g;而当铬元素浓度为3.75 mg/L时,铬的去除率可以达到81.0%;而且提高壳聚糖的含量有利于提高CS/PMAA纤维膜的吸附性能。改性CS/PMAA纤维膜吸附结果显示,正丙醛改性CS/PMAA纤维膜降低吸附性能,而进一步还原后的纤维膜的吸附性能优于未改性CS/PMAA纤维膜。实验结果表明,CS/PMAA纤维膜对铬离子具有良好的吸附性能;CS/PMAA纤维膜的吸附性能主要通过纤维氨基与Cr2O72-的相互作用进行,提高氨基的碱性和数量有利于提高纤维膜的吸附性能。Well defined chitosan( CS) hybrid fiber mats were prepared by electrospinning with poly( methyacrylic acid)( PMAA) as the co-spinning agent,and then they were cross-linked at 160 ℃ .The cross-linked CS/PMAA fiber was modified by propionaldehyde.The adsorption of Cr( Ⅵ) ion in aqueous solution showed that the adsorption capacity of this crosslinked CS/PMAA fiber mat could be up to 4. 98 mg/g when the Cr( Ⅵ) concentration was 6. 50 mg/L;The removal efficiency could be up to 81. 0% when the Cr( Ⅵ) concentration was 3. 75 mg/L. Moreover,the adsorption efficiency could be improved by increasing the basicity of amino-group in the fiber and the content of CS in the CS/PMAA fiber.The results demonstrated that Cr2O72- anion was adsorbed onto the amine group of the CS chain,and the adsorption ability of CS/PMAA fiber mat could be enhanced by increasing the basicity and amount of amine group.

关 键 词：壳聚糖 静电纺丝 纳米纤维膜 铬离子 吸附 

分 类 号：O636.1[理学—高分子化学]