Thermogravimetric study of uranium phosphates

Schaekers, J. M.

doi:10.1007/bf01911559

Cited by 9 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The selection of phosphorusoxygen compounds to provide a binding site for uranium is based on the affinity uranium has for phosphate-type anions and resins that use phosphorus ligands. Phosphates of various types form very stable complexes with uranium and have been implicated in the removal of uranium from aqueous solutions (7,(20)(21)(22)(23)(24)(25). Many of these compounds are very stable and exhibit very limited water solubility (26).…”

Section: Discussionmentioning

confidence: 99%

Granulated Activated Carbon Modified with Hydrophobic Silica Aerogel-Potential Composite Materials for the Removal of Uranium from Aqueous Solutions

Coleman

Coronado

Maxwell

et al. 2003

Environ. Sci. Technol.

View full text Add to dashboard Cite

Aqueous solutions of 100 parts per billion (ppb) uranium at pH 7 were treated with granulated activated carbon (GAC) that had been modified with various formulations of hydrophobic aerogels. The composite materials were found to be superior in removing uranium from a stock solution compared to GAC alone evaluated by a modified ASTM D 3860-98 method for batch testing. The testing results were evaluated using a Freundlich adsorption model. The best performing material has parameters of n = 287 and Kf = 1169 compared to n = 1.00, and Kf = 20 for GAC alone. The composite materials were formed by mixing (CH3O)4Si with the hydrophobic sol-gel precursor, (CH3O)3SiCH2CH2CF3 and with specified modifiers, such as H3PO4, Ca(NO3)2, and (C2H5O)3SiCH2CH2P(O)(OC2H5)2, elation catalysts, and GAC in a supercritical reactor system. After gelation, supercritical extraction, and sieving, the composites were tested. Characterization by FTIR and 31P NMR indicate the formation of phosphate in the case of the H3PO4 and Ca(NO3)2 composites and phosphonic acid related compounds in the phosphonate composite. These composite materials have potential application in the clean up of groundwater at DOE and other facilities.

show abstract

Section: Discussionmentioning

confidence: 99%

Granulated Activated Carbon Modified with Hydrophobic Silica Aerogel-Potential Composite Materials for the Removal of Uranium from Aqueous Solutions

Coleman

Coronado

Maxwell

et al. 2003

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Numerous studies of (UO ) (PO ) (H O) have investigated its chemical composition (16, 17, 19}21), powder Xray di!raction characteristics (17, 20}22), di!erential thermal and thermogravimetric behavior (17,20,21,23), infrared spectra (17,20,21), Raman spectra (20), and crystal morphology (20). Satisfactory crystals for a single-crystal study have apparently not been previously obtained, and the structure has never been reported.…”

Section: Introductionmentioning

confidence: 96%

The Crystal Structure of Triuranyl Diphosphate Tetrahydrate

Locock

Burns

2002

Journal of Solid State Chemistry

View full text Add to dashboard Cite

Über Ammonium‐Uranyl‐Vanadat und die Produkte seiner thermischen Zersetzung

Botto

Baran

1976

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

Hydratisiertes Ammonium‐Uranyl‐Vanadat wurde röntgenographisch und schwingungsspektroskopisch untersucht. Die Auswertung des Pulverdiagramms erwies, daß die Substanz mit dem Mineral Carnotit strukturell verwandt ist. Auch die IR‐ und Raman‐Spektren bestätigten diese Verwandschaft. Die thermische Zersetzung von NH4UO2VO4 · nH2O wurde erneut untersucht. Das dabei gebildete Uranyldivanadat, (UO2)2V2O7, wurde eingehend charakterisiert und das Verhalten bei Temperaturen bis zu 1200°C untersucht.

show abstract

Thermogravimetric study of uranium phosphates

Cited by 9 publications

References 9 publications

Granulated Activated Carbon Modified with Hydrophobic Silica Aerogel-Potential Composite Materials for the Removal of Uranium from Aqueous Solutions

Granulated Activated Carbon Modified with Hydrophobic Silica Aerogel-Potential Composite Materials for the Removal of Uranium from Aqueous Solutions

The Crystal Structure of Triuranyl Diphosphate Tetrahydrate

Über Ammonium‐Uranyl‐Vanadat und die Produkte seiner thermischen Zersetzung

Contact Info

Product

Resources

About