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.
作者
钟少锋
吉婉丽
刘晓云
ZHONG Shao-feng;JI Wan-li;LIU Xiao-yun(Department of Jianhu,Zhejiang Industry Polytechnic College,Shaoxing 312000,China)
出处
《化学试剂》
CAS
北大核心
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)。
