Removal of uranium from wastewater through Ni–Al-layered double hydroxide@carbon nanotubes functionalized by polyethyleneimine

Abstract

Nuclear energy is widely used as efficient energy. However, the production of a large amount of uranium-containing wastewater is considerably harmful to the environment. Adsorption is a commonly used method...

Efficient capture of uranium by a hydroxyapatite-modified polyethyleneimine@carbon nanotube composite from radioactive nuclear waste

“…Firstly, CNT-PEI was prepared according to a previous study. 25 Next, 0.4 g of Ca(NO 3 ) 2 , 0.2 g of CNT-PEI, and 0.2 g of Arg were added into a beaker and dissolved in 25 mL of distilled water under ultrasound at room temperature. This solution was marked as no.…”

“…In addition, since CNT-adsorbents were first applied to adsorb U by Schierz in 2009, 22 research on the use of CNTs as adsorbents has emerged endlessly. 9,23–25…”

Polyethyleneimine-functionalized β-cyclodextrin porous polymers for enhanced elimination of U(vi) from wastewater

“…The removal rate (R r , %) and the equilibrium absorption quantity (q e , mg g À1 ) were calculated using the following equation. 28,33,34 R r ð%Þ ¼…”

“…26 It is well known that there are a large number of amine and imine groups that can be complexed with heavy metals, and the N-containing groups have a better selective adsorption ability for nuclides. [27][28][29] Many researchers have developed uranium adsorption materials functionalized with polyethyleneimine (PEI). Zhou et al investigated a kind of chitosan/a-MnO 2 composite foam functionalized with PEI and its maximum adsorption quantity for U(VI) was 301.9 mg g À1 .…”

“…26 It is well known that there are a large number of amine and imine groups that can be complexed with heavy metals, and the N -containing groups have a better selective adsorption ability for nuclides. 27–29…”