Preparation of micron-sized alginate-based particles for rare earth adsorption

IF 2.2 4区 化学 Q3 CHEMISTRY, PHYSICAL Colloid and Polymer Science Pub Date : 2024-02-24 DOI:10.1007/s00396-024-05241-2
Yiwen Wang, Aijun Gong, Lina Qiu, Yuzhen Bai, Yang Liu, Ge Gao, Weiyu Zhao
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Abstract

In this brief report, omitting the step of dissolving sodium alginate with water, directly mixing sodium alginate powder with calcium chloride powder sufficiently, and gelatinizing sodium alginate by the impregnation method improve the characteristics of sodium alginate gel which is in the form of jelly and has poor mechanical properties. In this paper, micron-sized gel particles were prepared by slow impregnation method using mixed powder of sodium alginate and calcium chloride. The preparation method is simple and low-cost, and can be used for the recovery of rare earth ions from aqueous solutions. The SAG-2 gel prepared at a mass ratio of sodium alginate to calcium chloride of 1:1 showed the best adsorption performance; the particle size varies from 50 to 200 µm. The adsorption capacities of SAG-2 for La(III), Ce(III), Pr(III), and Nd(III) were 334.1, 349.8, 360.1, and 364.5 mg g−1 at pH = 5. The adsorption equilibrium was reached in 35 min. The kinetic study showed that the adsorption process was chemisorption and the adsorption isotherm was well fitted with the Freundlich model. The adsorption mechanism was explored using FTIR and XPS characterization, indicating that both -OH and -COOH functional groups were involved in adsorption. The desorption of rare earths by different eluents was explored and the recyclability of the adsorbent was examined.

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制备用于稀土吸附的微米级藻酸盐颗粒
在这篇简短的报告中,省略了用水溶解海藻酸钠的步骤,直接将海藻酸钠粉末与氯化钙粉末充分混合,并通过浸渍法使海藻酸钠胶化,改善了海藻酸钠凝胶呈胶冻状且机械性能较差的特性。本文利用海藻酸钠和氯化钙的混合粉末,采用慢速浸渍法制备了微米级的凝胶颗粒。该制备方法简单、成本低,可用于从水溶液中回收稀土离子。海藻酸钠与氯化钙的质量比为 1:1 时制备的 SAG-2 凝胶的吸附性能最好;粒径在 50 至 200 微米之间。在 pH = 5 条件下,SAG-2 对 La(III)、Ce(III)、Pr(III) 和 Nd(III) 的吸附容量分别为 334.1、349.8、360.1 和 364.5 mg g-1。吸附平衡在 35 分钟内达到。动力学研究表明,吸附过程为化学吸附,吸附等温线与 Freundlich 模型拟合良好。利用傅立叶变换红外光谱和 XPS 表征对吸附机理进行了探索,结果表明 -OH 和 -COOH 官能团都参与了吸附。研究了稀土在不同洗脱液中的解吸情况,并考察了吸附剂的可回收性。
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来源期刊
Colloid and Polymer Science
Colloid and Polymer Science 化学-高分子科学
CiteScore
4.60
自引率
4.20%
发文量
111
审稿时长
2.2 months
期刊介绍: Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.
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