Positively charged phosphonate-functionalized mesoporous silica for efficient uranium sorption from aqueous solution

Wei, Yanqi; Zhang, Lixia; Shen, Liang; Hua, Daoben

doi:10.1016/j.molliq.2015.04.056

Cited by 55 publications

(18 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nuclear energy is widely considered as a good substitute for fossil fuels because of its unparalleled energy density (about 2.7 million times that of coal in theory) and low emission of CO 2 . 1 The development of nuclear energy leads to a significant increase in the demands for uranium, which will be the basic material of nuclear plants in the future. However, the natural resource of uranium is limited and recycling of uranium from radioactive wastewater is difficult.…”

Section: Introductionmentioning

confidence: 99%

“…Among the various functional groups, phosphate groups (−PO 4 ) have attracted increased attention and play an important role in actinide separation because of their excellent stability, strong irradiation resistance, and high complexation ability with actinide element ions (such as Pu(IV), Am(III), and U(VI)). 1,6−11 Over the past years, various −PO 4 -functionalized adsorbents have been widely applied in U(VI) extraction from solution. 1,8−19 However, −PO 4 -functionalized adsorbents are usually synthesized by chemical modification 1,11−15 and polymerization techniques with appropriate organic reagents.…”

Section: Introductionmentioning

confidence: 99%

“…1,6−11 Over the past years, various −PO 4 -functionalized adsorbents have been widely applied in U(VI) extraction from solution. 1,8−19 However, −PO 4 -functionalized adsorbents are usually synthesized by chemical modification 1,11−15 and polymerization techniques with appropriate organic reagents. 8−10,16−19 To date, the development of a simple and efficient synthesis technique is important for the potential application of −PO 4 -functionalized adsorbents for U(VI) capture.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phosphate-Functionalized Polyethylene with High Adsorption of Uranium(VI)

Shao

Wang

et al. 2017

ACS Omega

View full text Add to dashboard Cite

For uranium extraction from seawater, development of new stable and reusable sorbents with high affinity and good selectivity for U(VI) is required. Herein, a new phosphate-functionalized polyethylene (denoted PO 4 /PE) was synthesized via a simple Ar-jet plasma treatment of PE in concentrated H 3 PO 4 and was employed in U(VI) extraction from seawater. The prepared PO 4 /PE shows superior performance in the extraction of trace U(VI) from seawater. The adsorption process followed the second-order kinetics model and the Langmuir model. The maximum adsorption capacity of PO 4 /PE for U(VI) reaches 173.8 mg/g at pH 8.2 and 298 K. PO 4 /PE can be effectively regenerated by 0.1 mol/L Na 2 CO 3 and reused well even after eight cycles. Experimental results offer a new approach for U(VI) uptake from seawater.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phosphate-Functionalized Polyethylene with High Adsorption of Uranium(VI)

Shao

Wang

et al. 2017

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Aqueous solutions containing uranium(VI) are usually divided into the following categories: acidic waste produced by the PUREX process, 5 and basic solution produced from alkaline leaching of uranium ores 6 and seawater. 13 Various ligands containing N, P, or O elements have been used to complex with uranyl ions, 14 such as phosphonate, 15 carboxylate acid, 16 amidoxime 17 and so on. 11,12 Due to its low operating cost and ease of operation, sorption is the most common strategy.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional polymeric microspheres for efficient uranium sorption from aqueous solution: synergistic interaction of positive charge and amidoxime group

et al. 2015

Self Cite

View full text Add to dashboard Cite

It is of strategic and ecological importance to capture uranium(VI) from aqueous solutions. A novel strategy is reported herein to synthesize bifunctional polymeric microspheres for efficient uranium removal from aqueous solution. Specifically, positively charged microspheres with amidoxime groups were prepared by emulsion polymerization. The high selectivity and fast kinetics for uranium(VI) can be achieved by the microspheres via the synergistic interaction of positive charge and coordinating ligand. The negative uranium tricarbonate complex would be adsorbed to the positively charged microspheres by coulombic interaction without interference of other metal cations, and the coordination may occur with amidoxime groups via ligand exchange. It is calculated that nearly 36% of the adsorbed uranium(VI) is due to coulombic interactions of the positive charge while 64% is due to coordination of amidoxime groups. To the best of our knowledge, this is the first report on colloidal particles with positive charges and ligand groups for uranium(VI) uptake from aqueous solution. † Electronic supplementary information (ESI) available: Experimental details for synthesis of block copolymers and functional microspheres; sorption kinetics and thermodynamics. NMR spectra; SEM images, particle size distributions, zeta potentials for characterizations. See Scheme 1 The schematic for the synthesis of poly(ionic liquid)functionalized microspheres. This journal isFig. 4 The characterization after sorption. (A) The sorption of uranium versus time for the PSt microspheres with (a) PEI 40 , and (b) PAOBI 40 (experimental conditions: 200 mL solution, 5 Â 10 À5 mol L À1 uranyl ion, 88 mg L À1 sorbent, pH 7.00, 298.15 K). (B) The desorption of uranium by EDTA versus time for uranium-PSt microspheres with PAOBI 40 . (C) FT-IR spectra (a) before and (b) after the sorption onto PSt microspheres. (D) Zeta potential of PSt microspheres-uranium complex.This journal is

show abstract

“…Sorption processes represent a feasible alternative as well due to multiple regenerations of the sorbents with strong acids and use of natural abundant materials as apatites, clays and other silica-containing systems which have porosity and functional groups for physical/chemical binding of pollutants in solution [10][11][12]. In order to increase the efficiency of separation, it is necessary to create new types of sorbents, which have a maximum selectivity towards specific elements.…”

mentioning

confidence: 99%

Sorption Properties of a Bentonite Based Material for Removal of Uranium from Alum Shale Leachate

Alvarenga¹,

Hayrapetyan²,

Skipperud³

et al. 2016

JCCE

View full text Add to dashboard Cite

A dynamic sorption experiment was performed for removal of uranium (VI or 6+) from a leachate from an alum shale landfill with a diatomite-bentonite based sorbent in a laboratory scale. Such material was grounded and treated chemically with H 3 PO 4 (phosphoric acid) and thermally for improving its porosity and resistance to water flow. A specific surface area of 209 m 2 ·g -1 was determined by the BET method. A sorption capacity of 30 µg·g -1 and 0.6 µg·g -1 was obtained at a pH of 7.5 and 4 respectively by means of Langmuir and Freundlich isotherm models. The flow rate of 3 mL·min -1 was effective for controlling the pH inside of the column. The sorption mechanism was investigated along with desorption of the element of interest for further process design considerations for a treatment unit on the landfill site.

show abstract

Positively charged phosphonate-functionalized mesoporous silica for efficient uranium sorption from aqueous solution

Cited by 55 publications

References 53 publications

Phosphate-Functionalized Polyethylene with High Adsorption of Uranium(VI)

Phosphate-Functionalized Polyethylene with High Adsorption of Uranium(VI)

Bifunctional polymeric microspheres for efficient uranium sorption from aqueous solution: synergistic interaction of positive charge and amidoxime group

Sorption Properties of a Bentonite Based Material for Removal of Uranium from Alum Shale Leachate

Contact Info

Product

Resources

About