Highly efficient capture of uranium from seawater by layered double hydroxide composite with benzamidoxime

Highly selective and ultrafast uptake of uranium from seawater by layered double hydroxide co-intercalated with acetamidoxime and carboxylic anions

“…34 As summarized in Table 2, a large q U m value of 339 mg g À1 of the present ACAO-AC-LDH is comparable to or even surpasses that of most reported sorbents. [39][40][41][53][54][55][56][57][58][59] Taking CMK-3@MgAl-LDHs (q U m ¼ 171 mg g À1 ) 53 with the same LDH substance as an example, our present ACAO-AC-LDH exhibits a much higher q U m , proving that both the amidoxime and carboxylate functional groups are conducive to the improvement of the chelating capacity for UO 2 2+ .…”

“…43 Using NO 3 -LDH as the precursor, ACAO-AC-LDH was synthesized through the swelling/ restoration method. 41 In brief, 0. The capture experiments of uranium were conducted by a batch method at ambient temperature.…”

“…The d value of 0.15 nm ascribed to the (110) plane of the LDH layer indicates that the LDH layers are well preserved during intercalation. 41 Based on CHN elemental analyses, the C : N molar ratio of ACAO-AC-LDH was found to be 6.78 : 1 (¼(4.59/12) : (0.79/14)) (Table S1 †), while the free ACAO molecule has a smaller C : N molar ratio of 1 : 1. The much higher C content in ACAO-AC-LDH suggests that the organic guests between LDH layers may be more than just ACAO.…”

“…The good dispersion of the LDH layers on interlayer BAO guests will increase the binding sites for UO 2 2+ , giving the improved adsorption capacity of U(VI) (q U m ¼ 327 mg g À1 ) and high U removal ($87%) in natural seawater. 41 This is the rst report on the interaction of amidoxime with LDH and its application for U extraction. This inspires us to study the insertion of AO compounds into the LDH layers to achieve the improved sorption performance of uranium.…”

Phosphate group functionalized magnetic metal–organic framework nanocomposite for highly efficient removal of U(VI) from aqueous solution

“…Therefore, the removal and recovery of uranium from wastewater is very significant not only for ecological stability and human health, but also for nuclear sustainable development 9,10 .Several strategies have been developed for radioactive wastewater treatment including coagulation 11 , membrane separation 12,13 , ion-exchange 14,15 , reductive precipitation 16,17 and adsorption 9,18,19 . Among these strategies, adsorption has been proven to be the most effective treatment method owning to its low cost, simple operation and environment compatibility [20][21][22] . In the past decades, various adsorption materials such as silica nanospheres, polymeric nanoparticles, carbon-based materials, and advanced porous materials have been extensively…”