4.7 Article

Selective removal of uranyl ions using ion-imprinted amino-phenolic functionalized chitosan

出版社

ELSEVIER
DOI: 10.1016/j.ijbiomac.2023.124073

关键词

Amino -phenol; Chitosan; Uranyl ions; Ion -imprinting

向作者/读者索取更多资源

Amino-phenolic chitosan derivative was used to imprint uranyl ions, resulting in a high-efficiency sorbent material (U-APCS) with improved selectivity and adsorption capacity for UO22+. The adsorption mechanism was determined to be chemisorption or coordination, and the adsorption followed a pseudo-second-order kinetic model and a Langmuir isotherm model. Thermodynamic analysis indicated that the adsorption of UO22+ was endothermic and spontaneous.
The recovery of uranium from aqueous effluents is very important for both the environment and the future of nuclear power. However, issues of sluggish rates and poor selectivity persist in achieving high-efficiency uranium extraction. In this study, uranyl (UO22+) ions were imprinted on an amino-phenolic chitosan derivative using an ion-imprinting method. First, 3-hydroxy-4-nitrobenzoic acid (HNB) units were joined to chitosan via amide bonding, followed by reducing the-NO2 residues into-NH2. The amino-phenolic chitosan polymer ligand (APCS) was coordinated with UO22+ ions, then cross-linked with epichlorohydrin (ECH), and finally the UO22+ ions were taken away. When compared to non-imprinted sorbent, the resulting UO22+ imprinted sorbent material (U-APCS) recognized the target ions preferentially, allowing for much higher adsorption capacities (qm = 309 +/- 1 mg/g) and improved adsorption selectivity for UO22+. The FTIR and XPS analyses supported the pseudo-second-order model's suggestion that chemisorption or coordination is the primary adsorption mechanism by fitting the data well in terms of kinetics. Also, the Langmuir model adequately explained the isotherms, suggesting UO22+ adsorption in the form of monolayers. The pHZPC value was estimated at around 5.7; thus, the optimum uptake pH was achieved between pHs 5 and 6. The thermodynamic properties support the endothermic and spontaneous nature of UO22+ adsorption.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据