Synthesis and characterization of surface ion-imprinted polymer based on SiO₂-coated graphene oxide for selective adsorption of uranium(vi)

Abstract

A novel surface ion-imprinted polymer based on graphene oxide for the selective adsorption of U(VI) has been synthesized. The resultant adsorbent was characterized by FT-IR, SEM, TGA and Raman spectroscopy. The adsorption behaviors of U(VI) onto the imprinted polymer were investigated as functions of pH, contact time, temperature and initial U(VI) concentration by batch experiments. A fast adsorption kinetics was clearly observed and the selectivity study revealed that the U(VI)-imprinted polymer exhibited excellent selectivity and good affinity to U(VI) in the presence of competitive ions. Meanwhile, the prepared imprinted polymer showed good reusability and stability.

Encapsulation of Silica Nanotubes from Elephant Grass with Graphene Oxide/Reduced Graphene Oxide and Its Application in Remediation of Sulfamethoxazole from Aqueous Media

“…Silica-GO/G hybrid adsorbents have been utilized as chromatographic packing, 25 solid-phase extraction sorbent, 23,26 and in adsorption of uranium in water. 20 Despite its high surface area, silica is not an efficient adsorbent for organic pollutants in aqueous media because of its hydrophilic nature. Silica is attracted to water molecules in solution when used as a sorbent.…”

A novel ion-imprinted amidoxime-functionalized UHMWPE fiber based on radiation-induced crosslinking for selective adsorption of uranium

“…41 When loading with template uranyl ions, with subsequent radiation-induced crosslinking, O]U]O bands appeared at 912 cm À1 , providing evidence of the successful coordination of the AO ligands with uranyl ions. 33 Aer leaching of the uranyl ions, it was obvious that the AO ber and AO-Imp ber presented very similar FTIR spectra, indicating that the identical chemical structure was restored. Furthermore, the absence of the O]U]O bands at 914 cm À1 in the spectra of the AO-Imp bers suggests the complete removal of the template uranyl ions from the adsorbents.…”

“…Ion imprinting technology has emerged as a solution to the problem of low selectivity in uranium extraction. 33,34 The typical procedure of this method is mainly based on the introduction of template particles in the preparation of crosslinked materials by crosslinking reagents followed by elution of the templates, thus endowing the adsorbent material with the ability of selectively identifying and coordinating particles that are similar in spatial size and structure to the template. 35 In recent years, much attention has been paid to the synthesis of uranium ionimprinted adsorbents, such as ion-imprinted mesoporous silica, 36 surface ion-imprinted polymers, 37 imprinted porous aromatic frameworks, 34 and ion-imprinted magnetic microspheres.…”

Two-Dimensional Ion-Imprinted Silica for Selective Uranium Extraction from Low-Level Radioactive Effluents

“…The effect of coexisting ions on sorption was conducted in a multicomponent cationic solution. The concentration of each ion is 5 × 10 –5 mol L –1 (Sr 2+ , Cs + , Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Ba 2+ , Cd 2+ , Al 3+ , Fe 3+ , Nd 3+ , Eu 3+ , La 3+ , Sm 3+ ). ,, In order to avoid Fe 3+ precipitation in the original solution, the pH value of the multi-ion solution was adjusted to 6.0. ICP-MS and AES were used to measure the concentration of uranium in the solution before and after adsorption.…”