Uranyl ion complexation of 2,2′-dihydroxyazobenzene enhanced on a backbone of poly(ethylenimine)

Noh, Young-Suk; Lee, Kwanpyo; Suh, Junghun

doi:10.1002/(sici)1099-0518(19991101)37:21<3936::aid-pola9>3.0.co;2-6

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…The ligand-exchange/decomplexation of [UO 2 (CO 3 ) 3 ] 4− may be the rate determining step as this anionic U(VI) species has high stability constant under prevailing seawater conditions. , Since decomplexation of [UO 2 (CO 3 ) 3 ] 4− can be catalyzed by H + -ions, the presence of acidic comonomer like AA and MAA were found to enhance the sorption kinetics of U(VI) in the AO-sorbent from seawater. − Contrary to decomplexation of [UO 2 (CO 3 ) 3 ] 4− , eq seems to suggest that the complexation of UO 2 2+ with the fixed-sites in hydrogels may be retarded in the presence of H + ions. It was reported that the microenvironment around the complexation sites governs the U(VI) sorption process from seawater. − Therefore, the AO gels with different acidic groups (−SO 3 H, −COOH, −P(O)(OH) 2 ) and strong basic group (−N + −(CH 3 ) 3 ) were prepared to study the possibility of enhancing overall kinetics involved in the sorption of U(VI) from seawater. The U(VI)-uptake efficiency of different hydrogels, measured by equilibrating hydrogels with well-stirred seawater spiked with 1−5 ppm of 233 U, are given in Table .…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that the microenvironment around the complexation sites governs the U(VI) sorption process from seawater. [30][31][32][33] Therefore, the AO gels with different acidic groups (-SO 3 H, -COOH, -P(dO)(OH) 2 ) and strong basic group (-N + -(CH 3 ) 3 ) were prepared to study the possibility of enhancing overall kinetics involved in the sorption of U(VI) from seawater. The U(VI)-uptake efficiency of different hydrogels, measured by equilibrating hydrogels with well-stirred seawater spiked with 1-5 ppm of 233 U, are given in Table 1.…”

Section: +mentioning

confidence: 99%

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Adsorptive Preconcentration of Uranium in Hydrogels from Seawater and Aqueous Solutions

Das

Pandey

Vasudevan

et al. 2009

Ind. Eng. Chem. Res.

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Cross-linked hydrogels containing poly(ethylene glycol methacrylate phosphate) (EGMP), poly(2-acrylamido-2-methyl-1-propane sulfonate) (AMPS), poly(acrylamidoxime) (AO), and AO along with different acidic (acrylic acid (AA), methacrylic acid (MAA), AMPS, and EGMP) and basic (3-(acrylamido propyl) trimethylammonium chloride (APTAC)) comonomers were prepared by UV-initiated bulk polymerization. These hydrogels were characterized in terms of their chemical structure and U(VI)-uptake behavior from aqueous and seawater samples. Except AMPS hydrogel, all these hydrogels were found to sorb U(VI) quantitatively (≈90%) from the seawater. The U(VI)-sorption kinetics in EGMP and AO+MAA (60:40) hydrogels were found to be faster than other hydrogels under seawater conditions. The presence of a strong acid (−SO3H) comonomer with AO retards the overall kinetics involve in the U(VI) sorption from seawater. It was also observed that the U(VI) sorption kinetics was highly dependent on the composition of the acidic and AO groups in the hydrogel. The uptake of U(VI) from acidic solution in AO+MAA hydrogel was found to be dependent on the acidity of the feed solution, and there was no uptake of U(VI) in this hydrogel from solution containing 1 mol L−1 HNO3. Contrary to this, EGMP hydrogel could sorb the U(VI) from solution containing high concentration of HNO3. This indicated that EGMP hydrogel can also be used for U(VI) preconcentration from the nuclear waste. U(VI) complexed in EGMP hydrogel and AO+MAA could be desorbed by their equilibration with 0.5 mol L−1 Na2CO3 and 1 mol L−1 HCl/HNO3, respectively. The mechanism of sorption of U(VI) in the hydrogels was studied to understand the factors that control the U(VI) sorption from seawater.

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Section: Resultsmentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Adsorptive Preconcentration of Uranium in Hydrogels from Seawater and Aqueous Solutions

Das

Pandey

Vasudevan

et al. 2009

Ind. Eng. Chem. Res.

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“…38 This work followed previous studies by the same group where DHAB was attached to a chloromethylated cross-linked poly(St) support, 36 chloromethylated poly(St-co-DVB), 37 and pure PEI. 152 In the former references, the chloromethyl group could also be converted to a quaternary ammonium function by treating with various tertiary amines. 36,37 In this work, spectrophotometric titration experiments revealed 1:1 complexes of various metals, including uranium, with PEI-bound DHAB (Figure 31).…”

Section: Chemical Reviewsmentioning

confidence: 99%

Materials for the Recovery of Uranium from Seawater

et al. 2017

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More than 1000× uranium exists in the oceans than exists in terrestrial ores. With nuclear power generation expected to increase over the coming decades, access to this unconventional reserve is a matter of energy security. With origins in the mid-1950s, materials have been developed for the selective recovery of seawater uranium for more than six decades, with a renewed interest in particular since 2010. This review comprehensively surveys materials developed from 2000-2016 for recovery of seawater uranium, in particular including recent developments in inorganic materials; polymer adsorbents and related research pertaining to amidoxime; and nanostructured materials such as metal-organic frameworks, porous-organic polymers, and mesoporous carbons. Challenges of performing reliable and reproducible uranium adsorption studies are also discussed, as well as the standardization of parameters necessary to ensure valid comparisons between different adsorbents.

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Uranyl ions uptake on poly(AAc/AAm)-cl-N,N-MBAAm hydrogel

Raj

Chauhan

2009

Polym. Bull.

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Uranyl ion complexation of 2,2′-dihydroxyazobenzene enhanced on a backbone of poly(ethylenimine)

Cited by 5 publications

References 18 publications

Adsorptive Preconcentration of Uranium in Hydrogels from Seawater and Aqueous Solutions

Adsorptive Preconcentration of Uranium in Hydrogels from Seawater and Aqueous Solutions

Materials for the Recovery of Uranium from Seawater

Uranyl ions uptake on poly(AAc/AAm)-cl-N,N-MBAAm hydrogel

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