Structure Determination of Uranium Halogenide Phosphates UXPO4·2H2O (X=Cl, Br) from Powder Diffraction Data

Bénard-Rocherullé, Patricia; Louër, M.; Louër, D.; Dacheux, Nicolas; Brandel, V.; Genet, M.

doi:10.1006/jssc.1997.7466

Cited by 19 publications

(14 citation statements)

References 16 publications

(10 reference statements)

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“…The uranium coordination sphere is defined by a square antiprismatic environment and is typical of the uranium oxidation state +4. The bond length distance between the uranium center and the apical oxygen atoms of the phosphate groups (U–O PO4 ) are in the range from 2.24(2) to 2.26(3) Å and are close to the U–O PO4 bond distance observed on the tetravalent uranium phosphate, such as U 2 (PO 4 )(P 3 O 10 ) or UXPO 4 ·2H 2 O (X = Br or Cl). The U–O water distances are longer [2.50–2.55(3) Å].…”

Section: Results and Discussionsupporting

confidence: 56%

Structure and Solution Speciation of U^IV Linked Phosphomolybdate (Mo^V) Clusters

et al. 2015

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Crystals of [NaU(Mo6P4O31H7)2]·5Na·(H2O)n (NaUMo6) have been synthesized by slow evaporation of an aqueous mixture containing uranyl nitrate, sodium molybdate, phosphoric acid, and sodium dithionate. Single crystal diffraction of NaUMo6 reveals the assembly of {Mo6P4} clusters linked into one-dimensional chains with alternating Na(+) and U(4+) cations. To our knowledge, NaUMo6 is a unique example of Mo(5+) based polyoxometalate associated with actinides. With the use of similar synthesis conditions but without uranium in the aqueous solution, [Na(Mo6P4O31H10)2]·5Na·(H2PO4)·(H2O)n (NaMo6) is obtained. NaMo6 is a sandwich type cluster which is built on the assemblage of two {Mo6P4} units linked by one sodium cation. Using small-angle X-ray scattering techniques and aqueous electrolyte based dissolution strategies, we can accurately observe chains of [UNa(Mo6P4O31H7)2]n(5n), where n = 7 is the dominant soluble specie. Likewise, the dimeric form of [Na(Mo6P4O31H10)2](5-) dominates the aqueous solution, revealing the structural units observed in the crystal structure are also stable in solution, under appropriate dissolution conditions.

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Section: Results and Discussionsupporting

confidence: 56%

Structure and Solution Speciation of U^IV Linked Phosphomolybdate (Mo^V) Clusters

et al. 2015

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“…It should be noted that in addition to the anhydrous UFPO 4 reported here there exist two additional U(IV) halide phosphates (UClPO 4 , and UBrPO 4 ) both dihydrates . These materials exist as sheet-type structures with the U(IV)–phosphate bridges forming two-dimensional rings.…”

Section: Resultsmentioning

confidence: 61%

Retention of a Paramagnetic Ground State at Low Temperatures in a Family of Structurally Related U^IV Phosphates

2018

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A new uranium fluoride phosphate, UFPO, was synthesized via a mild hydrothermal route and characterized optically, thermally, and magnetically. Two thermal transformation products, UO(PO) and UUO(PO), were discovered to be structurally related, and were subsequently synthesized for bulk property measurements. All three materials failed to follow Curie-Weiss behavior at low temperatures, attributed to the nearly ubiquitous singlet ground state of U(IV), transitioning into a Curie-Weiss paramagnetic regime at high temperatures. Neutron diffraction experiments were performed on UFPO and UUO(PO) in order to characterize this unusual magnetic behavior.

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“…Uranium(VI), the thermodynamically stable valence of U, is the major U contamination in the soil and ground waters. Choosing a suitable content and morphology of adsorbent, which retains high specific area and strong interaction with U(VI), is considered as the significant key for improving adsorption capacity and stability of the adsorbent [27–32]. Most recently, phosphate based adsorbents [22, 33–39], especially, inorganic phosphate, such as ZrP 2 O 7 , Zr 2 O(PO 4 ) 2 , Th 4 (PO 4 >P 2 O 7 [38, 39], LaPO 4 [37] have been reported for U(VI) adsorption, since the strong chelation or complexation between phosphates and U(VI), along with phosphates’ excellent shielding effect on radioactive ions and extremely low solubility [22, 37–40].…”

Section: Introductionmentioning

confidence: 99%

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

Xiao

et al. 2019

Journal of Hazardous Materials

104

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In this study, the ultra-thin iron phosphate Fe7(PO4)6 nanosheets (FP1) with fine-controlled morphology, has been designed as a new two-dimensional (2D) material for uranium adsorption. Due to its unique high accessible 2D structure, atom-dispersed phosphate/iron anchor groups and high specific surface area (27.77 m2·g−1), FP1 shows an extreme-high U(VI) adsorption capacity (704.23 mg·g−1 at 298 K, pH = 5.0 ± 0.1), which is about 27 times of conventional 3D Fe7(PO4)6 (24.51 mg·g−1-sample FP2) and higher than most 2D absorbent materials, showing a great value in the treatment of radioactive wastewater. According to the adsorption results, the sorption between U(VI) and FP1 is spontaneous and endothermic, and can be conformed to single molecular layer adsorption. Based on the analyses of FESEM, EDS, Mapping, FT-IR and XRD after adsorption, the possibile adsorption mechanism can be described as a Monolayer Surface Complexation and Stacking mode (MSCS-Mode). Additionally, the research not only provide a novel preparing method for 2D phosphate materials but also pave a new pathway to study other two-dimensional adsorption materials.

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Structure Determination of Uranium Halogenide Phosphates UXPO4·2H2O (X=Cl, Br) from Powder Diffraction Data

Cited by 19 publications

References 16 publications

Structure and Solution Speciation of U^IV Linked Phosphomolybdate (Mo^V) Clusters

Structure and Solution Speciation of U^IV Linked Phosphomolybdate (Mo^V) Clusters

Retention of a Paramagnetic Ground State at Low Temperatures in a Family of Structurally Related U^IV Phosphates

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

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Structure Determination of Uranium Halogenide Phosphates UXPO4·2H2O (X=Cl, Br) from Powder Diffraction Data

Cited by 19 publications

References 16 publications

Structure and Solution Speciation of UIV Linked Phosphomolybdate (MoV) Clusters

Structure and Solution Speciation of UIV Linked Phosphomolybdate (MoV) Clusters

Retention of a Paramagnetic Ground State at Low Temperatures in a Family of Structurally Related UIV Phosphates

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

Contact Info

Product

Resources

About

Structure and Solution Speciation of U^IV Linked Phosphomolybdate (Mo^V) Clusters

Structure and Solution Speciation of U^IV Linked Phosphomolybdate (Mo^V) Clusters

Retention of a Paramagnetic Ground State at Low Temperatures in a Family of Structurally Related U^IV Phosphates