Preparation of amino-functionalized dialdehyde starch adsorbent for adsorption of Pb(II) ions

被引：0
|
作者：
Yu G. [1 ]
Minxin T. [1 ]
Hongmei W. [1 ]
机构：
[1] School of Chemical and Environmental Engineering, Liaoning University of Technology, Liaoning, Jinzhou
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 12期
关键词：
adsorbent; adsorption mechanism; dialdehyde starch; lead(II) ions;
D O I：
10.16085/j.issn.1000-6613.2023-0123
中图分类号：
学科分类号：
摘要：
Amino functionalized dialdehyde starch (NH2-DAS) was successfully synthesized by Schiff base reaction of DAS with hydrazine hydrate. During the preparation process, dialdehyde starch (DAS) was firstly prepared using starch as raw material and NaIO4 as oxidant. The morphology, element distribution, thermal stability and surface chemical property of the NH2-DAS adsorbent were characterized by SEM, EDX, XRD, TGA, FTIR and XPS. The adsorption behavior and adsorption mechanism of NH2-DAS adsorbent toward Pb(?) from aqueous solution were studied. The results showed that the adsorption behavior of Pb(?) onto NH2-DAS adsorbent could be well described by Langmuir isotherm model and Pseudo-second-order kinetic mode. The NH2-DAS exhibited a high adsorption capacity of 165mg/g toward Pb(?) at adsorption temperature of 45C , pH=5.5 and the adsorption time of 240min. The adsorption of NH2-DAS on Pb(?) mainly depended on the coordination bonds between-C= = N-,-NH2 groups and Pb(?) ions. The adsorption process was a spontaneous, endothermic and entropy increase process. After five times of regeneration test, the adsorption capacity of NH2-DAS for Pb(?) was still above 84.8% of original adsorption capacity. Therefore, the NH2-DAS adsorbent had potential application prospects in the removal of Pb(?) ions from aqueous solution. © 2023 Chemical Industry Press. All rights reserved.
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页码：6589 / 6599
页数：10
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