Layered double hydroxide intercalated with dimethylglyoxime for highly selective and ultrafast uptake of uranium from seawater

Qian Wang; Lixiao Yang; Huiqin Yao; Zhenglong Wu; Rong Liu; Shulan Ma

doi:10.1039/d2dt02381d

Layered double hydroxide intercalated with dimethylglyoxime for highly selective and ultrafast uptake of uranium from seawater

Dalton Trans. 2022 Aug 30;51(34):13046-13054. doi: 10.1039/d2dt02381d.

Authors

Qian Wang¹, Lixiao Yang¹, Huiqin Yao², Zhenglong Wu³, Rong Liu³, Shulan Ma¹

Affiliations

¹ Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China. mashulan@bnu.edu.cn.
² School of Basic Medical Sciences, Ningxia Medical University, Yinchuan 750004, China. huiqin_yao@163.com.
³ Analytical and Testing Center, Beijing Normal University, Beijing 100875, China. wuzl@bnu.edu.cn.

PMID: 35971915
DOI: 10.1039/d2dt02381d

Abstract

In this study, we demonstrate the first example of a MgAl layered double hydroxide intercalated by a ketoxime compound (dimethylglyoxime, DMG), that is, MgAl-DMG-LDH (abbr. DMG-LDH), which exhibits excellent capture of uranium (U(VI)) both at high (ppm) and low (ppb) concentrations. The as-formed DMG-LDH shows an enormous maximum U(VI) sorption capacity (qUm) of 380 mg g^-1 and an exceptionally rapid sorption rate (k₂ = 2.97 g mg^-1 min^-1), reaching a high uptake of 99.14% within 5 min. For natural and contaminated seawater with high concentrations of Na⁺, Ca²⁺, Mg²⁺ and K⁺ concomitant cations, the DMG-LDH still can trap ∼85% U, displaying highly effective sorption toward U. The interaction mechanism between UO₂²⁺ and DMG^2- provides an important reference for the development of highly effective capture of U(VI) by ketoxime materials. The DMG-LDH is currently the best ketoxime material for uranium extraction from nuclear waste and seawater.