Selective adsorption of uranium(VI) from aqueous solutions using the ion-imprinted magnetic chitosan resins

Zhou, Limin; Shang, Chaoqun; Liu, Zhongfan; Huang, Guolin; Adesina, Adesoji A.

doi:10.1016/j.jcis.2011.09.069

Cited by 212 publications

(79 citation statements)

References 32 publications

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“…The observed lower adsorption of uranyl ions in the acidic pH range was because the H 3 O + ions present in the solution competed with the UO 2 2+ ions for complexation by the fabricated adsorption sites within the polymeric matrix of the sorbent (Zhou et al, 2012). There was a high rate of extraction of U(VI) from aqueous solution as sample pH was increased.…”

Section: +mentioning

confidence: 98%

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Synthesis of bulk ion-imprinted polymers (IIPs) embedded with oleic acid coated Fe3O4 for selective extraction of hexavalent uranium

Tavengwa¹,

Cukrowska²,

Chimuka³

2014

WSA

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A selective and reliable method for the extraction of trace quantities of U(VI) by the use of a magnetic U(VI) ion-imprinted polymer (IIP) was developed. In this study, oleic acid (OA) coated magnetite nano-particles were incorporated into the cross-linked polymeric matrix of the selective sorbent, in order to gain the physical advantages of separating the polymers. Many physico-chemical factors influence the adsorption process; uranyl ion uptake ability based on these parameters was investigated. The optimum parameters obtained were sample pH 4, 50 mg of the magnetic polymer, a contact time of 45 min and an initial U(VI) concentration of 2 mg·ℓ , respectively. The adsorption behaviour of U(VI) in the presence of other competing metal ions onto the cross-linked magnetic polymers was also examined in binary mixtures and the order of selectivity was found to be U(VI) > Pb(VI) > Ni(II). The resulting magnetic nano-composite polymers were found to be stable up to the sixth cycle of use and reuse. The Freundlich adsorption model was used for the mathematical description of the adsorption equilibrium and the adsorption kinetic data fitted the pseudo-first-order model with R 2 > 0.92.

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Section: +mentioning

confidence: 98%

“…by magnetic sorbents (Wang at al., 2011;Zhou et al, 2012;Tavengwa et al, 2014). This study is focused on the synthesis of magnetic ion-imprinted polymers selective to hexavalent uranium, and the application of these to aqueous samples.…”

mentioning

confidence: 99%

Synthesis of bulk ion-imprinted polymers (IIPs) embedded with oleic acid coated Fe3O4 for selective extraction of hexavalent uranium

Tavengwa¹,

Cukrowska²,

Chimuka³

2014

WSA

View full text Add to dashboard Cite

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“…From the studies on the adsorption kinetics and thermodynamics of Au(III) ions, it was found that the adsorption process obeyed the pseudo-second-order kinetic model [12]. Magnetic chitosan composites were used as sorbents for removal of radioactive species from aqueous medium [14,38,101]. Magnetic chitosan composite particles exhibited high adsorption capacity for both UO 2 (II) (666.67 mg/g) and Th(IV) (312.50 mg/g) and the authors conclude that the OH and -NH 2 groups were involved in this process [38].…”

Section: Removal Of Metal Ionsmentioning

confidence: 99%

Bionanocomposites for Magnetic Removal of Water Pollutants

Sousa

Daniel‐da‐Silva

Silva

et al. 2015

Advanced Structured Materials

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Magnetic separation in water remediation processes is of great interest in current environmental technologies. An important aspect in this field has been the development of efficient sorbents for water purification units, namely by exploiting other functionalities that might originate more sustainable technologies. This chapter describes the state-of-art on the chemical preparation of magnetic sorbents comprising inorganic particles and biopolymer matrices. Fundamental aspects related to nanoparticle synthesis of iron oxides and nanomagnetism will be first addressed. The use of these particles in biopolymers matrices such as polysaccharides will be then reviewed as an innovative strategy aiming at production of eco-friendly sorbents for magnetic separation.

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“…The sorption of U(VI) onto nanofiber adsorbents was examined by placing 50 mg of each adsorbent in 50 mL (30 mg/L) metal ion solution at nanoparticle content of 5 wt%, pH of 4.5 and 25°C for 5 h. Sorption capacity and selectivity coefficient of adsorbents were used to compare adsorbents and select the best adsorbent for U(VI) sorption. The sorption capacity and selectivity coefficient were calculated according to [29]:…”

Section: Selective Sorption Studiesmentioning

confidence: 99%

Selective sorption of U(VI) from aqueous solutions using a novel aminated Fe3O4@SiO2/PVA nanofiber adsorbent prepared by electrospinning method

Mirzabe

Keshtkar

2014

J Radioanal Nucl Chem

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A novel electrospun Fe 3 O 4 @SiO 2 @APTES/ PVA nanofiber adsorbent for U(VI) sorption was synthesized and characterized by FTIR, SEM, BET and TG analyses. The effects of pH, nanoparticles content, adsorbent dose, contact time, initial U(VI) concentration, temperature and co-existing ions were studied in batch experiments. The sorption affinity of metal ions onto adsorbent was U. The kinetic and isotherm data were accurately described by the doubleexponential and Langmuir model, with a maximum sorption capacity of 68.96 mg/g with a pH of 5. Thermodynamic parameters were evaluated to understand the nature of sorption process. The reusability of adsorbent was determined after five sorption-desorption cycles.

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Selective adsorption of uranium(VI) from aqueous solutions using the ion-imprinted magnetic chitosan resins

Cited by 212 publications

References 32 publications

Synthesis of bulk ion-imprinted polymers (IIPs) embedded with oleic acid coated Fe<sub>3</sub>O<sub>4</sub> for selective extraction of hexavalent uranium

Synthesis of bulk ion-imprinted polymers (IIPs) embedded with oleic acid coated Fe<sub>3</sub>O<sub>4</sub> for selective extraction of hexavalent uranium

Bionanocomposites for Magnetic Removal of Water Pollutants

Selective sorption of U(VI) from aqueous solutions using a novel aminated Fe3O4@SiO2/PVA nanofiber adsorbent prepared by electrospinning method

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