A high-capacity amidoxime-functionalized magnetic composite for selective uranium capture in Salt Lake water. Issue 6 (December 2021)

• Record Type: Journal Article
• Authors: Liu, Nijuan; Li, Cuicui; Bai, Jing; Liang, Hao; Gao, Qinqin; Wang, Nana; Guo, Ruibin; Qin, Zhi; Mo, Zunli
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 6(2021)
• Publication Date: 2021-12
• Subjects: Uranium adsorption -- Amidoxime-functionalized -- Magnetic composite -- High selectivity -- Salt Lake water; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106688
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: In order to promote the sustainable development and utilization of nuclear energy, it is essential to develop convenient and efficient methods for uranium enrichment. In this work, an amidoxime functionalized magnetic composite (CS-Ppy-Fe3 O4 -AO) was synthesized by a simple two-step process and applied for selective adsorption of uranium from natural Salt Lake water. The effect of CS-Ppy-Fe3 O4 -AO on the uranium adsorption capacity under different conditions such as pH, contact time, temperature, ionic strength and interfering ions were firstly investigated by batch experiments. The results indicated that the maximum adsorption capacity was 937.14 mg/g at pH= 6 and T = 298 K, which was higher than that of most currently reported magnetic adsorbents. Moreover, the adsorbent could be easily regenerated and still maintained high adsorption capacity after five adsorption-desorption cycles. Meanwhile, the adsorption mechanism of CS-Ppy-Fe3 O4 -AO on uranium was investigated by FT-IR and XPS, and they showed that nitrogen-oxygen functional groups (e.g. amidoxime and amino groups) played a predominant role on the adsorption of uranium. What' s more, the CS-Ppy-Fe3 O4 -AO showed excellent selectivity and adsorption capacity (3.75 mg/g) on uranium in Salt Lake water, which implied that the CS-Ppy-Fe3 O4 -AO could be potentially used as a desired adsorbent on uranium enrichment. Graphical Abstract: ga1 Highlights: Synthesis of amidoxime-functionalized magnetic composites. Selective adsorption uranium under different conditions. The Langmuir isotherm and pseudo-second-order kinetic models are suitable. Easily regenerated and reusable after five adsorption-desorption cycles. Successfully applied in uranium adsorption in natural Salt Lake water.