What is it about?
V2O5 is significantly soluble in water so the use of this oxide or mixed oxides systems based on V2O5, in photocatalytic processes in water, may release vanadium species in the aqueous medium, generating a certain amount of additional contamination. The present paper is devoted to study the physical-chemical properties of V2O5-TiO2 composition and its use in photocatalytic processes in aqueous media. The focus is on the possibility of V2O5 dissolution and influence of this phenomenon on the photocatalysis. The photocatalytic activities of these mixed pigments have been investigated on the discoloration of a dye (Methyl Orange) in aqueous medium under two selected chemical (pH) and photochemical illumination (UV and UV-vis) conditions.
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Why is it important?
Vanadium is toxic specie to man and animal; however vanadium oxides are widely used in industry as important rare additives, and it has been investigated the vanadium leaching from a spent industrial V2O5/TiO2 catalyst by sulfuric acid at atmospheric pressure. Thus, recovery of vanadium from various sources and environmental water is important, not only to the environment but also to the industry.
Perspectives
The observations found in this work raise issues in the field of photocatalytic processes when using V2O5 based materials, from which V2O5 (depending of the method of preparation and of its thermal stability) may be released and dissolved, wholly or partly, in the aqueous reaction medium systems, generating species of vanadium which are toxic. The question of the significant solubility of V2O5 in water, and the added pollution generated in this medium by toxic vanadium species, can be directed to its recovery by controlled photocatalytic processes, as described in this paper by using TiO2.
JOSÉ ANTONIO NAVIO
Universidad de Sevilla
Read the Original
This page is a summary of: Titania-Vanadia Mixed Oxides: Thermal Stability and Photo-assisted Recovery of V(V) Released From the Use of this System, in Water, Current Catalysis, May 2017, Bentham Science Publishers,
DOI: 10.2174/2211544706666170110110604.
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