Preparation of ethylenediamine-modified pectin/alginate/Fe3O4 microsphere and its efficient Pb2+adsorption properties

文献类型： 外文期刊

第一作者： Li, Ya

作者： Li, Ya;Zhang, Ming;Ma, Fei-yue;Qiao, Jian;Chen, Rong-hao;Du, Li-qing;Shuai, Xi-xiang;Chen, Jun;Ma, Fei-yue

作者机构：

关键词： Pectin; Ethylenediamine; Magnetic microsphere; Pb2+; Adsorption

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.025； 五年影响因子：7.626 ）

ISSN： 0141-8130

年卷期： 2022 年 223 卷

页码：

收录情况： SCI

摘要： As a common macromolecular carbohydrate, pectin has a strong affinity for Pb2+. An ethylenediamine modified pectin (EP48) with 48 % of amidation was prepared and exhibited great removal efficiency towards Pb2+ in our previous study. However, the EP48 has drawbacks in adsorption including low mechanical strength and difficulty in separation. In this study, EP48 was compounded with sodium alginate (Alg) and Fe3O4 to synthesize EP48/Alg/ Fe3O4 microsphere. The physicochemical properties and Pb2+ adsorption characteristics of microsphere were analyzed. It was found that the microsphere exhibited good thermal stability, mechanical strength, porous structure, as well as acid tolerance. The pseudo-second-order model well described the kinetics of adsorption process, indicating the chemical adsorption is dominant. The Langmuir model fitted the experimental data well, and the maximum adsorption capacity reached 175.19 mg/g. Adsorption-desorption experiments showed that the removal rate of the microsphere maintained over 98.9 % after 10 cycles. The X-ray photoelectron spec-troscopy (XPS) analyses revealed that the potential adsorption mechanism included ion-exchange and chelation. The above results suggested its potential use for the removal of Pb2+ from wastewater.

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