Highly selective and ultrafast uptake of uranium from seawater by layered double hydroxide co-intercalated with acetamidoxime and carboxylic anions. Issue 34 (8th August 2022)

• Record Type: Journal Article
• Authors: Wang, Qian; Wang, Hui; Yang, Lixiao; Yao, Huiqin; Wu, Zhenglong; Yu, Tao; Shi, Keren; Ma, Shulan
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 34(2022)
• Page Start: 17520
• Page End: 17531
• Publication Date: 2022-08-08
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta01952c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The LDH material co-intercalated by acetamidoxime and carboxylic anions exhibits highly selective and ultrafast extraction of uranium from seawater. Abstract : Through the swelling/restoration reaction, acetamidoxime (ACAO) and the hydrolysates of carboxylic anions are co-intercalated into MgAl-LDH interlayers to generate a new material ACAO-AC-LDH. The as-formed ACAO-AC-LDH displays outstanding adsorption performance for uranium (U(vi )) both at high (ppm) and low (ppb) concentrations. The enormous maximum U sorption capacity ( q Um) of 339 mg g −1, exceptionally rapid uptake ( k 2 = 3.06 g mg −1 min −1 ), and ultrahigh % removals (>90% at C U0 = 1–100 ppm) are among the best reported for U sorbents. For natural seawater with a trace amount of U (∼3.65 ppb) but highly concentrated concomitant cations of Ca 2+ (∼400 ppm), Mg 2+ (∼1300 ppm), K + (∼500 ppm) and Na + (∼11 000 ppm), the ACAO-AC-LDH can trap ≥99.99% U (reduced to ≤0.001 ppb), exhibiting extremely high selectivity ( K Ud ∼ 10 6 mL g −1 ) and capture ability for U. All these demonstrate that ACAO-AC-LDH is a first-class uranium sorbent, which is suitable for removing U from nuclear waste and extracting U from seawater.