磁性壳聚糖的制备及吸附靛蓝胭脂红的性能评价  

Synthesis of Mercapto Functional Fe_3O_4-Chitosan and Its Absorption of Anionic Dye

作　　者：张婉婷[1] 吴桂萍[1] 崔龙哲[1] 

机构地区：[1]中南民族大学资源与环境学院,湖北武汉430074

出　　处：《环境科学与技术》2017年第4期19-23,44,共6页Environmental Science & Technology

基　　金：湖北省自然科学基金(2015CFB550)

摘　　要：采用水热法制得磁性Fe_3O_4,利用巯基乙酸(TGA)修饰Fe_3O_4(Fe_3O_4-SH),戊二醛(GLA)为交联剂使壳聚糖(CS)与Fe_3O_4-SH进行化学交联,制备磁性壳聚糖(Fe_3O_4-SH/CS)。以靛蓝胭脂红为吸附对象,研究接触时间、pH值、温度及染料初始浓度对Fe_3O_4-SH/CS吸附靛蓝胭脂红的影响。结果表明,pH值为3,Fe_3O_4-SH/CS对靛蓝胭脂红溶液的最大吸附量可达到531 mg/g。等温吸附数据与Freundlich等温吸附模型拟合良好,吸附动力学数据符合拟二级动力学模型。Fe_3O_4-SH/CS对靛蓝胭脂红水溶液具有很高的去除率。Fe3O4 was prepared by chemical co-precitation method and modified by mercaptoacetic acid. Modified Fe3O4 and chitosan were crosslinked by glutaraldehyde（GLA） to prepared magnetic chitosan（Fe3O4-SH/CS）. The obtained sorbent Fe3O4-SH/CS was used for the sorption of a model dye i.e. indigo carmine（IC）. The effect of sorption time, solution pH,temperature and initial dye concentration are researched in that modified magnetic chitosan microspheres adsorbed IC. The results of pH revealed that pH 3 was the best condition for the IC removal with the maximum IC uptake of 531 mg/g. The isotherm data was better fitted to the Freunlich model（R2=0.996 0）. Moreover, the kinetic data was better described by the pseudo-second-order model. In brief, this study reports an effective sorbent Fe3O4-SH/CS for removal of IC from aqueous solution.

关 键 词：四氧化三铁 巯基乙酸 壳聚糖 戊二醛 磁性吸附剂 靛蓝胭脂红 

分 类 号：X703.1[环境科学与工程—环境工程]