Removal of UO2 2+ from aqueous solution by plasma functionalized MWCNTs

Adsorption, bioconcentration and transformation of radioactive U(VI) on filamentous fungi <italic>Aspergillus Niger</italic>

“…. 而此时, U(VI)主 要以UO 2 2+ 的形式存在 [32] , 菌丝体和UO [35] , 等离子功能化碳纳米管(75.1 mg/g U(VI), pH 5.6, T=303 K) [34] , 海洋藻类和酵母固定化的硅胶 (56.7 mg/g U(VI), pH 4, T=303 K)…”

The removal of uranium(VI) from aqueous solution by graphene oxide–carbon nanotubes hybrid aerogels

“…For each experiment, 15 mg GO-CNTs aerogels were added into a conical flask containing 25 mL U(VI) solution with designed concentration and pH value under a reciprocating water bath shaker condition. The pH of the solution was adjusted using HClO 4 and NaOH solution and measured by digital pH-meter. The supernatant of the solution was separated after shaking at specified temperature.…”

“…So far, sorption has been considered to be one of the most effective methods for the separation of uranium(VI) from radioactive wastewater because it is highefficient and easily handling [2]. Recent studies show that nanomaterials, especially carbon-based nanocomposites, exhibit better sorption performance in comparison with non-nanomaterials [3][4][5][6][7][8][9][10][11]. However, the high dispersibility of nanomaterials in aqueous solutions makes it difficult to separate sorbents from aqueous phase after sorption, which restricts the real application in large volumes of waters [12][13][14].…”

Linear β-Cyclodextrin Polymer Functionalized Multiwalled Carbon Nanotubes as Nanoadsorbent for Highly Effective Removal of U(VI) from Aqueous Solution Based on Inner-Sphere Surface Complexation

“…The possible risk of the aquatic system being contaminated by uranium is a salient environmental concern because of its severe ramifications for human health. , Accordingly, the removal of uranium from aqueous solutions is of great importance toward environmental control and public health. An adsorption technique has been developed because of its conspicuous advantages of having lower cost, convenient operation, and extensive applicability in the disposal of various pollutants, − and it has been employed for removing uranyl ions in effluent water. − In the past decades, the rapid progress in nanotechnology provides intriguing new opportunities for developing nanomaterials. − Especially, prodigious efforts have been made to discover novel adsorption materials for the removal of uranyl ions in uranium-containing wastewater, such as carbon nanotubes (CNTs)/ multiwalled carbon nanotubes (MWCNTs), − mesoporous carbon, − metal–organic frameworks, − natural/synthetic polymers, − leather waste, tripolyphosphate LDH, titanate nanotubes, graphitic carbon nitride, biomass, and Fe 3 O 4 @PDA@TiO 2 . Among the various adsorbents, CNTs/MWCNTs have attracted considerable interest because of their good stability toward acid–base, excellent mechanical properties, large surface area, and higher thermal/radiation resistance. , However, the inherent hydrophobicity and easy aggregation of CNTs/MWCNTs in aqueous solution might impede their adsorption behaviors and decrease the removal efficiency of pollutants, consequently limiting their wide application in real work .…”

“…An adsorption technique has been developed because of its conspicuous advantages of having lower cost, convenient operation, and extensive applicability in the disposal of various pollutants, − and it has been employed for removing uranyl ions in effluent water. − In the past decades, the rapid progress in nanotechnology provides intriguing new opportunities for developing nanomaterials. − Especially, prodigious efforts have been made to discover novel adsorption materials for the removal of uranyl ions in uranium-containing wastewater, such as carbon nanotubes (CNTs)/ multiwalled carbon nanotubes (MWCNTs), − mesoporous carbon, − metal–organic frameworks, − natural/synthetic polymers, − leather waste, tripolyphosphate LDH, titanate nanotubes, graphitic carbon nitride, biomass, and Fe 3 O 4 @PDA@TiO 2 . Among the various adsorbents, CNTs/MWCNTs have attracted considerable interest because of their good stability toward acid–base, excellent mechanical properties, large surface area, and higher thermal/radiation resistance. , However, the inherent hydrophobicity and easy aggregation of CNTs/MWCNTs in aqueous solution might impede their adsorption behaviors and decrease the removal efficiency of pollutants, consequently limiting their wide application in real work . To overcome this limitation, the modification of CNTs/MWCNTs by grafting various functional groups has been developed to improve their dispersibility and removal capacity. − β-Cyclodextrin (β-CD) is a cyclic oligosaccharide consisting of seven glucopyranose units linked by α-1,4-bonds and possesses a unique structure with a hydrophilic periphery and a hydrophobic interior .…”