聚多巴胺改性双醛壳聚糖的制备及其吸附性能  

Preparation and adsorption properties of polyamine modified dialdehyde chitosan

作　　者：金海军 陈泽世 李丽丽 杨文菊 唐雨霞 王浩[1] JIN Haijun;CHEN Zeshi;LI Lili;YANG Wenju;TANG Yuxia;WANG Hao(College of Textile Engineering and Art,Anhui Agricultural University,Hefei 230036,Anhui,China)

机构地区：[1]安徽农业大学轻纺工程与艺术学院,安徽合肥230036

出　　处：《精细化工》2023年第2期371-379,共9页Fine Chemicals

基　　金：科技部“科技助力经济2020”重点专项项目(国科发资[2020]151号);安徽省科技重大专项项目(202103a06020005)。

摘　　要：以壳聚糖(CS)为基材,采用高碘酸钠选择性氧化制备了双醛壳聚糖(DCS),再通过接枝聚多巴胺(PDA)制得了环保型聚多巴胺/双醛壳聚糖(PDA/DCS)。采用SEM、FTIR、N2吸附-脱附、XRD对两种改性壳聚糖进行了表征,并测试了其对胭脂红的吸附性能。结果表明,CS被高碘酸钠氧化后引入的活性基团醛基可与PDA产生共价结合,选择性氧化有效提高了DCS和PDA/DCS的吸附效果;与原CS相比,DCS结晶度明显下降,孔隙率和比表面积提高,PDA/DCS呈现较密集的多孔结构。DCS和PDA/DCS对胭脂红的吸附过程均遵循准二级动力学模型和Langmuir等温模型;但与DCS相比,PDA/DCS的吸附速率及吸附量明显提升,当染料初始质量浓度为700 mg/L时,PDA/DCS最大单分子层吸附量可达到1194.4 mg/g,且经过5次循环使用后,其吸附量仍达到616.90 mg/g。An environmental-friendly polydopamine modified dialdehyde chitosan (PDA/DCS) was synthesized by polydopamine (PDA) grafted with dialdehyde chitosan (DCS),which was prepared via sodium periodate selective oxidation of chitosan (CS).The two kinds of modified chitosan were then characterized by SEM,FTIR,N2adsorption-desorption and XRD,followed by investigation on their adsorption performance for carmine.The results revealed that the active aldehyde group generated by sodium periodate oxidization of CS could covalently bind to PDA,and the selective oxidation could effectively improve the adsorption performance of both DCS and PDA/DCS.Compared with the unmodified CS,DCS exhibited decreased crystallinity and increased porosity and specific surface area,while PDA/DCS displayed a dense porous structure.The adsorption processes of carmine by both DCS and PDA/DCS followed the quasi-second-order kinetic equation and Langmuir isothermal model.Moreover,the adsorption rate and capacity of PDA/DCS were significantly enhanced in comparison to those of DCS.The maximum monolayer adsorption capacity of PDA/DCS reached 1194.4 mg/g when the initial mass concentration of dye was 700 mg/L.PDA/DCS still kept an adsorption capacity of 616.90 mg/g even after five recycles.

关 键 词：壳聚糖 高碘酸钠 聚多巴胺 吸附 胭脂红 水处理技术 

分 类 号：X703[环境科学与工程—环境工程]