Separation and Recovery of Uranium from Wastewater Using Sorbent Functionalized with Hydroxamic Acid
TL;DR: In this article, a poly-acryl hydroxamic acid (PHOA) was used as an extractant for the recovery of uranium from nuclear waste solution, and various parameters such as sorbent solubility in different medium, effect of various cations on UVI sorption, desorption performance of different eluents with respect to U(VI) sorption has been investigated in detail.
Abstract: A newly developed hydroxamic acids functionalized acrylic based solid phase sorbent, named as poly-acryl hydroxamic acid (PHOA) is used as an extractant for the recovery of uranium from nuclear waste solution. Various parameters such as sorbent solubility in different medium, effect of various cations on U(VI) sorption, desorption performance of different eluents with respect to U(VI) sorption has been investigated in detail. U(VI) sorption behaviors of the sorbent were studied in different concentration of competitive ions such as Mg2+, Fe3+, and NO3− and it was found that the sorbent was capable of removing the U(VI) efficiently in the presence of high concentration of these ions.
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TL;DR: An overview of the versatile polymer materials containing different functional groups at the main or side chain to remove hazardous inorganic species can be found in this paper, where water-insoluble, nanocomposite and water-soluble polymers are used in adsorption and ion exchange processes.
Abstract: This paper is an overview of the versatile polymer materials containing different functional groups at the main or side chain to remove hazardous inorganic species. These materials include water-insoluble, nanocomposite and water-soluble polymers. Water-insoluble polymers and nanocomposites are used in adsorption and ion exchange processes, whereas water-soluble polymers are employed with ultrafiltration membranes in the liquid-phase polymer-based retention technique. © 2015 Society of Chemical Industry
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TL;DR: In this article, the effects of crosslinkers on the adsorption properties of poly(hydroxamic acid), (PHA) hydrogels in aqueous solutions of some phenazine dyes such as Neutral Red, Safranin T, and Janus Green have been investigated.
Abstract: Swelling and adsorption properties of poly(hydroxamic acid), (PHA) hydrogels in aqueous solutions of some phenazine dyes such as Neutral Red, Safranin T, and Janus Green have been investigated. PHA hydrogels containing N,N′ methylenebisacrylamide or ethyleneglycoldimethacrylate were used in experiments on swelling, diffusion and adsorption of the dyes. The equilibrium swelling (Seq) values of PHA hydrogels in aqueous solutions of the phenazine dyes were calculated as 2.16–33.25 g g−1. Swelling kinetic parameters such as initial swelling rate, swelling rate constant, and maximum swelling were found. Dye diffusion into hydrogels was found to be non-Fickian in character. Diffusion coefficients are ranged 1.32 × 10−6 cm2 s−1 − 44.70 × 10−6 cm2 s−1. Adsorption of the phenazine dyes onto PHA hydrogels was studied by batch technique. PHA hydrogels in the phenazine dye solutions showed the dark coloration. The data was found that Freundlich isotherm model fits. According the Freundlich constants, the adsorption isotherms are of S-type in Giles classification. All swelling and binding parameters for PHA-EGDMA were found to be higher than those for PHA-NNMBA. The type of crosslinker influenced the swelling, binding, and sorption more than the type of dye. Finally, it can be said that PHA hydrogels may be used a sorbent for removal of dyes. POLYM. ENG. SCI., 2017. © 2017 Society of Plastics Engineers
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TL;DR: By ion exchange undesirable ions are replaced by others which don't contribute to contamination of the environment by means various modern types of ion exchangers.
1,400 citations
TL;DR: The developed solid phase extraction method was successively utilized for the determination of traces thorium(IV) and uranium(VI) in environmental samples by ICP-MS.
162 citations
TL;DR: In this article, a radiation-induced grafting of acrylonitrile (AN), acrylic acid (AA), and the mixture of AN/AA onto PE film, and subsequent amidoximation of cyano groups of poly-AN graft chains was demonstrated.
141 citations
TL;DR: It is concluded that bifunctional resins could be used effectively to treatwater contaminated with ClO4- and traces of U(VI), and dilute acid washes could minimize hazardous wastes by separating sorbed U( VI) from ClO 4- prior to the regeneration of the spent resin loaded withClO4-.
Abstract: This study investigated the sorption affinity and capacity of six strong-base anion-exchange (SBA) resins for both uranium [U(VI)] and perchlorate (ClO4-) in simulated groundwater containing varying concentrations of sulfate (SO42-). Additionally, desorption of U(VI) from spent resins was studied to separate U(VI) from resins with sorbed ClO4- for waste segregation and minimization. Results indicate that all SBA resins investigated in this study strongly sorb U(VI). The gel-type polyacrylic resin (Purolite A850) showed the highest sorption affinity and capacity for U(VI) but was the least effective in sorbing ClO4-. The presence of SO42- had little impact on the sorption of U(VI) but significantly affected the sorption of ClO4-, particularly on monofunctional SBA resins. A dilute acid wash was found to be effective in desorbing U(VI) but ineffective in desorbing ClO4- from bifunctional resins (Purolite A530E and WBR109). A single wash removed ∼75% of sorbed U(VI) but only ∼0.1% of sorbed ClO4- from the bi...
114 citations
TL;DR: Ion imprinted polymer (IIP) material of mesoporous nature was prepared in two steps: (i) by forming binary/ternary complexes of uranyl imprint ion with a suitable nonvinylated uranophile, formamidoxime and/or vinylated ligand, 4-vinyl pyridine (VP) and (ii) by thermally copolymerizing them with 2-hydroxy ethyl methacrylate (HEMA) as the functional monomer and ethylene glycol dimethacrylated (EGDMA)
100 citations