School of Resource & Environment and Safety Engineering, University of South China, Hengyang, 421001, China.
School of Resource & Environment and Safety Engineering, University of South China, Hengyang, 421001, China; Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes, Hengyang, 421001, China.
Chemosphere. 2022 Jan;287(Pt 2):132193. doi: 10.1016/j.chemosphere.2021.132193. Epub 2021 Sep 7.
In order to remove and recover uranium from acidic uranium-bearing wastewater in uranium mining and metallurgy. Herein, a novel chitosan/Chlorella pyrenoidosa composite adsorbent bearing phosphate ligand (CSP/CP) was designed and synthesized, demonstrating a high uranium adsorption capacity at a pH of 5 and excellent selectivity in an aqueous solution with eight coexisting ions. The CSP/CP exhibits a maximum adsorption capacity (1393.338 mg g) and selectivity (Su = 80.53%) for uranium, which is higher than many reported adsorbents. Mechanism analysis shows that the surface of CSP/CP is rich in hydroxyl, amino, phosphate and carboxyl groups, resulting in an excellent three-dimensional structure with active sites for high-performance uranium adsorption; U(VI) is selectively bound via ion exchanges with -COOH and -OH and through surface complexation with NH and PO. Furthermore, by desorption with 0.1 M NaCO + 2% HO at 318 K, CSP/CP can be recycled more than five times. It provides a new scientific basis for the preparation of high selectivity composite adsorbent by chitosan.
为了从铀矿冶酸性含铀废水中去除和回收铀。本文设计并合成了一种新型载膦壳聚糖/栅藻复合吸附剂（CSP/CP），在 pH 值为 5 时对铀具有高吸附容量，在八种共存离子的水溶液中具有优异的选择性。CSP/CP 对铀的最大吸附容量（1393.338mg/g）和选择性（Su=80.53%）均高于许多已报道的吸附剂。机理分析表明，CSP/CP 表面富含羟基、氨基、磷酸根和羧基，具有良好的三维结构和丰富的活性位点，有利于高性能铀的吸附；U(VI) 通过与-COOH 和-OH 的离子交换以及与 NH 和 PO 的表面络合来选择性结合。此外，在 318 K 下用 0.1 M NaCO + 2% HO 进行解吸，CSP/CP 可以重复使用五次以上。为壳聚糖制备高选择性复合吸附剂提供了新的科学依据。
