Highly efficient extraction of uranium from strong HNO₃ media achieved on phosphine oxide functionalized superparamagnetic composite polymer microspheres

Abstract

Recovery of uranium from strong acidic solution using magnetic nanoparticles as adsorbents is very important for sustainable nuclear energy, due to their superparamagnetic character and high adsorption efficiency for uranium....

Highly efficient extraction of uranium from aqueous solution using imidazole functionalized core–shell sunflower-like superparamagnetic polymer microspheres: understanding adsorption and binding mechanisms

“…Predictably, many characteristic peaks ascribed to Fe 3 O 4 could be evidently observed. 6 In addition, a dispersive peak at a 2 θ of about 12.7° representing amorphous P (MBA-VIM) was also observed in addition to the characteristic peaks of Fe 3 O 4 , given that the adsorbent might be employed at high temperature. Thus, the thermal stability of Fe 3 O 4 /P (MBA-VIM) was also investigated.…”

“…Thus, with the development of nuclear energy, a large amount of U( vi ) will be released into the environment during the process of fuel cycling, which will cause great harm to the environment; 1–3 (2) core–shell superparamagnetic polymer nanomaterials are now emerging as novel promising adsorbent materials for removing uranium from aqueous solution, due to their excellent structural stability, high concentration of accessible organic ligands and superparamagnetic properties. 4–9 For example, the magnetic Fe 3 O 4 core facilitates easy separation by using magnetic force, and the polymer shell can not only prevent the Fe 3 O 4 core being destroyed efficiently, but also provides abundant active adsorption sites for uranium. Up to now, various core–shell superparamagnetic polymer nanomaterials have been reported to demonstrate excellent adsorption efficiency for uranium.…”

“…So far, the chelating ligands frequently used to develop core–shell magnetic polymer adsorbents for uranium extraction were amidoxime groups because of their strong coordination affinity towards uranium. 6 However, the introduction of an amidoxime group is frequently via the wet chemistry method, which is tedious and often causes the wastage of materials. 10–13 Besides, poor selectivity, especially against vanadium, is also a major limitation for amidoxime.…”

“…14,15 In addition to an amidoxime group, a phosphide oxide ligand is another efficient ligand for uranium, which has also been widely employed to extract uranium from aqueous solutions. 16–20 For example, our previous work has reported a series of phosphide oxide functionalized magnetic polymer microspheres, 4,6–8 which showed excellent adsorption efficiency for uranium. However, the phosphide oxide ligand may produce a number of pernicious compounds to the environment or human health in post-treatment, such as solid phosphorus oxides, which would limit its application in the field of uranium containing wastewater treatment to a great extent.…”

Highly efficient photocatalytic organic dyes degradation based on 1D magnetic Bi2Fe4O9/C@AgBr composite

“…Thence, introducing magnetism to form magnetic photocatalytic materials can maintain the catalytic activity of composites and accelerate their separation from the reaction mixture. [ 44–47 ] Furthermore, the 1D structure could transfer photogenerated carries to reaction centers effectively and solve the carrier spatial localization problems. [ 48 ] C with high electrical conductivity has been widely used in the field of microwave absorption and photocatalysis.…”