Facile synthesis of high performance porous magnetic chitosan - polyethylenimine polymer composite for Congo red removal
Facile synthesis of high performance porous magnetic chitosan - polyethylenimine polymer composite for Congo red removal
复制标题
轻松合成高性能多孔磁性壳聚糖-聚乙烯亚胺聚合物复合材料用于去除刚果红
DOI：
10.1016/j.ijbiomac.2017.10.025
复制
发表时间：
2018
影响因子：
8.2
通讯作者：
Zhang QQ
中科院分区：
文献类型：
--
作者：
You Lijun;Huang Ci;Lu Feifei;Wang Ao;Liu Xiaocui;Zhang Qiqing;Zhang QQ
A new porous magnetic chitosan-polyethylenimine (Fe3O4/CS-PEI) polymer composite was synthesized by crosslinking chitosan (CS) with polyethylenimine (PEI) in the present of FeCl3·6H2O and FeCl2·4H2O in alkaline condition and applied to remove congo red (CoR) from aqueous solutions. The Fe3O4/CS-PEI composite was characterized by SEM, XRD, TGA and FT-IR analysis. The polymer composite owned high positive charge, large surface area, multi-level pore distribution and magnetic responsiveness. The porous magnetic Fe3O4/CS-PEI composite showed ultrahigh capacity (1876 mg/g) for CoR removal. It removed over 99.3% of CoR (100 mg/L) when the dosage was over 1.4 g/L. A higher temperature was benefit to CoR removal. The Fe3O4/CS-PEI composite was effective for CoR removal in a wide pH range (3–13). Kinetics studies suggested that the adsorption mechanism of CoR followed the pseudo-second model and it was also affected by the boundary layer diffusion. The adsorption process followed the Redlich-Peterson isotherm equation. Thermodynamic studies also demonstrated that this adsorption process was spontaneous, favorable and endothermic. The activation energy (Ea) of the adsorption process was 34.08 kJ/mol, indicating that chemisorption existed in the process. The results demonstrated that the porous magnetic Fe3O4/CS-PEI polymer composite is a promising adsorbent for the efficient removal of dye pollutants from aqueous solution.
