磁性壳聚糖交联沸石的制备及对Cu^(2+)的吸附性能

Preparation of Magnetic Chitosan Cross-linked Zeolite and Its Performance for Cu^(2+)Adsorption

随着工业化的快速发展,Cu^(2+)污染日益严重。为了减轻Cu^(2+)污染,通过沸石和磁性纳米Fe3O4的联合作用,制备出一种新型多层吸附材料,即磁性壳聚糖交联沸石(FS-CS)以改善壳聚糖的吸附作用,从而达到去除Cu^(2+)的目的。通过扫描电镜能谱仪(SEM-EDS)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)对FS-CS的结构和性能进行表征,并考察FS-CS投加量、吸附时间、pH对吸附Cu^(2+)的影响。结合吸附动力学、吸附热力学等多种方法,探讨其吸附机理。结果表明:FS-CS吸附Cu^(2+)的最佳初始pH为5,最佳吸附时间为4 h,最大吸附容量可达32.705 mg/g,且FS-CS具备良好的分离和可再生能力;FS-CS对Cu^(2+)的吸附过程符合准二级动力学模型,吸附等温线符合Freundlich吸附模型。

The rapid development of industry leads to increasingly serious Cu^(2+)pollution.To reduce Cu^(2+)contamination,a new type of multilayer adsorption material,namely magnetic chitosan cross⁃linked zeolite(FS⁃CS),was prepared through the combined effect of zeolite and magnetic nano⁃Fe3O4 to improve the adsorption performance of chitosan,so as to achieve the purpose of Cu^(2+)removal.The structure and property of FS⁃CS were characterized by scanning electron microscopy and energy spectrometer(SEM⁃EDS),X⁃ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR),and the effects of FS⁃CS dosage,adsorption time and pH on Cu^(2+)adsorption were investigated.The adsorption mechanism was discussed by means such as adsorption kinetics and adsorption thermodynamics.The maximum adsorption capacity of FS⁃CS was up to 32.705 mg/g,the optimal initial pH was 5 and the optimal adsorption time was 4 h,and FS⁃CS had good separation and regeneration ability.The adsorption process of Cu^(2+)by FS⁃CS conformed to the pseudo⁃second⁃order kinetic model,and the adsorption isotherm conformed to the Freundlich adsorption model.