Оксид висмута молибдена (Bi2MoO6)

Description

Molybdenum bismuth oxide Bi2MoO6 (bismuth molybdate) is a complex oxide with a layered Aurivillius structure, a visible light photocatalytic semiconductor. CAS 13565-96-3, EC number 236-955-7.

Basic Attributes

• CAS No.: 13565-96-3
• Chemical formula: Bi, Mo, O (Bi2MoO6)
• Molecular weight: 609.9
• Exact weight: 611.83600
• EU number: 236-955-7
• PSA Specifications: 241
• XLogP3: -0.61200

Physico-chemical characteristics

• Density: 9.320
• Melting point: 936 °C

Synonyms

Molybdic acid (H6MoO6), bismuth salt (3+); bismuth(VI) molybdate (Bi2MoO6); bismuth molybdate (Bi2MoO6); additional CAS numbers 12400-18-9, 39455-87-3, 2416676-41-8.

Substance class and mechanism of action

Bi2MoO6 belongs to the family of layered Aurivillius oxides with a band gap of 2.5-2.8 eV, which provides efficient absorption of visible light, in contrast to the classical TiO2 photocatalyst, which operates only under ultraviolet light. The non-centrosymmetric crystal structure gives the material piezoelectric properties, due to which mechanical deformation enhances the separation of photogenerated charges - this is the basis for the piezophotocatalytic effect of the material.

Scope of application

The main application is photocatalysis under visible light for wastewater treatment: decomposition of tetracycline and other organic pollutants, degradation of phenol with concomitant hydrogen evolution when combined with direct Z-scheme catalysts, decomposition of formaldehyde (including with platinum nanoadditives) at room temperature, photoreduction of CO2 into fuel products. The practical application of the material is limited by the narrow range of light absorption and the rapid recombination of photogenerated electron-hole pairs, to overcome which the material is combined with other semiconductors in composite photocatalysts.

Storage

Store in a dry place in a tightly closed container, avoid dust formation when working with powder. Bismuth molybdate is synthesized by the hydrothermal method or the solid-phase reaction of bismuth and molybdenum oxides; the choice of synthesis method directly determines the morphology of particles - from nanorods and nanoplates to hierarchical structures - and, accordingly, the photocatalytic activity of the final material. The PSA 241 index, one of the highest among the bismuth compounds considered in this catalog, reflects the large number of oxygen atoms in the coordination environment of molybdenum and bismuth, which determines the developed surface and increased photocatalytic activity of nanostructured forms of the material. The density of the material, 9.320, is one of the highest among the bismuth oxides considered in this catalogue, which is taken into account when calculating reactor loading and powder dosing in technological processes for preparing photocatalyst suspensions. The thermal stability of the compound (melting point 936 °C) allows the material to be used in high-temperature sintering processes for ceramic composite photocatalysts.