Coprecipitation of polonium with bismuth phosphate

It was found that Po(IV) coprecipitates to a high degree with bismuth phosphate from weakly acidic solutions. The degree of coprecipitation of Po(II) under the same conditions is substantially lower. Coprecipitation with bismuth phosphate can be utilized for the separation of polonium from inorganic salts present in urine.     

The separation of241Am from bones by coprecipitation with bismuth phosphate

The conditions of²⁴¹Am separation from bone by coprecipitation with BiPO₄ were studied. It was found that by coprecipitation with BiPO₄ ²⁴¹Am can be separated with high yield from different amount of bone. The main condition of the achievement of a high yield is a low Fe/III/ concentration in solution at americium coprecipitation.     

Simultaneous determination of neptunium,plutonium, americium and curium using coprecipitation with bismuth phosphate

Radiochemical studies of the coprecipitation behaviour of neptunium, plutonium, americium and curium with bismuth phosphate were carried out on the basis of the effect of the following variables: kinds of acid, acidity, and amounts of bismuth and coexisting other elements. Simultaneous determination of the actinide elements using the coprecipitation was accomplished by adding 1 mg of bismuth at 0.2M phosphoric acid and by direct measurement of alpha spectrum of the precipitates. The order of the coprecipitation yields of the elements was also discussed by the difference of both the oxidation states and sulfate complex formation.     

Sequential separation of neptunium,plutonium, americium and curium using coprecipitation with bismuth phosphate

The reaction of neptunium, plutonium and americium with oxidizing or reducing agents in phosphoric acid solution has been studied to design a separation procedure of the actinide elements using coprecipitation with bismuth phosphate. In the presence of uranium, successive separation of neptunium, plutonium, americium and curium was accomplished by combining the coprecipitation and redox reaction of the elements. The coprecipitation behaviour of fission products during the course of sequential separation of the actinide elements on bismuth phosphate was also discussed.     

Effect of alumina in multicomponent bismuth phosphate catalyst supported on silica-alumina for propylene ammoxidation reaction

The effect of compositions of silica-alumina support on multicomponent bismuth phosphate catalyst (MBP) was investigated for the propylene ammoxidation. It is appears that small amounts of Al₂O₃ cause retardation of the ammoxidation reaction, which would be due to activation of the selective oxidation pathway. It is understood from such results that the catalytic action of the MBP is essentially different with that of the multicomponent bismuth molybdate catalyst (MBM), which is generally used as propylene ammoxidation catalyst. This revised version was published online in June 2006 with corrections to the Cover Date.     

A new pillared lithium bismuth phosphate,LiBi7.37P3O19, with elliptical channels

The structure of a new lithium bismuth phosphate, LiBi_7.37P₃O₁₉, consists of infinite OBi₄ edge‐sharing tetrahedral chains in the ac plane, which form Bi₂O₂ layers parallel to the b axis. They are sandwiched between PO₄ tetrahedral and Bi polyhedral layers. The PO₄–Bi–PO₄ layers are bridged by columns formed by one Bi polyhedron flanked on each side by LiO₄ tetrahedra. This bridging Bi atom lies on a twofold axis, special position 4e of the C2/c space group. This arrangement creates pillared open elliptical channels parallel to [010].     

Determination of bismuth oxide in and on high-purity bismuth

Bismuth is dissolved in mercury on shaking with ammonium nitrate solution in a nitrogen atmosphere; bismuth oxide is insoluble and so can be separated by flotation and dissolved in nitric acid for spectrophotometric determination as tetraiodobismuthate(III). The method is applied to various bismuth samples containing about 0.01% Bi₂O₃, the relative standard deviation being 7–11%.     

Fabrication of bismuth subcarbonate nanotube arrays from bismuth citrate

Bismuth subcarbonate ((BiO)2CO3) nanotubes with uniform diameters of about 3-5 nm were fabricated from bismuth citrate; these nanotubes exhibit antibacterial properties against Helicobacter pylori (50% inhibition at 10 microg mL(-1)), a bacterium causing peptic ulcers and gastritis.     

Lead bismuth calcium sodium phosphate: Pb4.6Bi0.4Ca2.6Na2.4(PO4)6

The title compound, lead bismuth calcium sodium phosphate, Pb_4.6Bi_0.4Ca_2.6Na_2.4(PO₄)₆ crystallizes in the apatite structure type, with vacancies in sites 2a or 2b that are normally occupied by anions. The fact that the Bi and Pb ions are mainly localized in the 6h sites confirms the electron lone‐pair influence on the apatite structure.     

Self-assembled bismuth nanocrystallites

Using a high-temperature organic solution reduction method, highly crystalline and single domain bismuth nanoparticles have been synthesized and self-assembled.     

Formation of the bismuth thiolate compound layer on bismuth surface

The structure and composition of thiolate multilayers formed at bismuth monocrystal electrodes from solutions of 1-octadecanethiol and 1-decanethiol in ethanol at open circuit potential are characterized by cyclic voltammetry, electrochemical impedance and infrared reflectance spectroscopy, optical microscopy and AFM methods. Analysis of results demonstrates that after holding of Bi(h k l) electrodes during some hours in solution of thiol in ethanol bismuth is covered with a thick porous layer of bismuth thiolate compound. For the verification of formed thiolate layers the new compounds tris(1-octadecylthio)bismuthine and tris(1-decylthio)bismuthine were also synthesised from bismuth(III)oxide and thiol in hexane solution and a similarity of properties with the bismuth thiolate compounds, formed at the bismuth electrode surface, has been demonstrated.     

Potentiometric studies on bismuth ferrocyanide and the determination of bismuth

Summary The reaction between bismuth nitrate and ferrocyanides of alkali metals such as sodium, potassium, lithium and ammonium, has been studied potentiometrically using platinum as an indicator electrode in conjunction with a saturated calomel electrode through KNO₃ bridge. The equivalence point obtained from the maximum value of dE/dV corresponds to the formation and complete precipitation of a compound having molecular formula BiMFe(CN)₆, where M represents an alkali metal. The potentiometric curves are symmetrical on both sides of the end point and the results obtained are very accurate and reproducible. The method of potentiometric titrations, though simple, offers a rapid and accurate means for the determination of bismuth solutions at fairly low concentrations. The effect of addition of ethanol and electrolytes on the course of the reaction has been studied.     

Heat capacity, enthalpy and entropy of bismuth niobate and bismuth tantalate

The heat capacity and the heat content of bismuth niobate BiNbO₄ and bismuth tantalate BiTaO₄ were measured by the relaxation method and Calvet-type heat flux calorimetry. The temperature dependencies of the heat capacities in the form C_pm=128.628+0.03340 T−1991055/T²+136273131/T³ (J K^-1 mol^-1) and 133.594+0.02539 T−2734386/T²+235597393/T³ (J K^-1 mol^-1) were derived for BiNbO₄ and BiTaO₄, respectively, by the least-squares method from the experimental data. Furthermore, the standard molar entropies at 298.15 K S_m(BiNbO₄)=147.86 J K^-1 mol^-1 and S_m(BiTaO₄)=149.11 J K^-1 mol^-1 were assessed from the low temperature heat capacity measurements. To complete a set of thermodynamic data of these mixed oxides an attempt was made to estimate the values of the heat of formation from the constituent binary oxides.     

Synthesis of bismuth complexes from bismuth iodide and ammonium and phosphonium salts

The complexes [Et₂NH₂] ₃ ⁺ [BiCl₆]^3? (I), [NH₄]⁺[BiI₄(C₅H₅N)₂]^?·2C₅H₅N (II), [Ph₃MeP] ₂ ⁺ [BiI₅]^2? (III), [Ph₃MeP] ₂ ⁺ [BiI₅(C₅H₅N)]^2?·C₅H₅N (IV), [Ph₃MeP] ₃ ⁺ [Bi₃I₁₂]^3? (V), [Ph₃(i-Pr)P] ₃ ⁺ [Bi₃I₁₂]^3?·2Me₂C=O (VI), [Ph₃BuP] ₂ ⁺ [Bi₂I₈·₂Me₂C=O]^2? (VII), and [Ph₃BuP] ₂ ⁺ [Bi₂I₈·2Me₂S=O]^2? (VIII) were obtained by reactions of bismuth iodide with ammonium and phosphonium iodides in acetone, pyridine, or dimethyl sulfoxide.     

Potassium barium bismuth oxide

KBa₄Bi₃O crystallizes in the centrosymmetric tetragonal space group I4/mcm. In this compound, bismuth is present as two anionic species, i.e. Bi₂^4? dumbbells [Bi—Bi 3.113 (3) Å] and isolated Bi^3?. Atom Bi1 (Bi^3?) lies inside a bicapped square antiprism (2 × K and 8 × Ba). Atom Bi2, which forms the Bi₂^4? dumbbell, sits inside a bicapped distorted trigonal prism (2 × K and 6 × Ba). O atoms occupy tetra­hedral voids between Ba atoms.