Visible light-responsive photocatalytic nanoparticle dispersion liquid, method for producing same, and member having photocatalytic thin film on surface

摘要

It is possible to obtain a visible light-responsive photocatalytic nanoparticle dispersion liquid containing copper-containing titanium oxide nanoparticles by subjecting an aqueous peroxotitanic acid solution containing a copper compound to hydrothermal reaction for crystallizing the aqueous solution by means of heat under high pressure. The visible light-responsive photocatalytic nanoparticle dispersion liquid thus obtained exhibits excellent dispersion stability of titanium oxide nanoparticles within a water-based dispersion medium even when left in a cold and dark indoor area for a long period of time, expresses photocatalytic activity even in visible light (400 to 800 nm) alone, and can easily create a photocatalytic thin film which is extremely transparent and exhibits excellent durability, and in which the state of copper coordination when exposed to heat or ultraviolet rays is stable and cannot be easily modified.

主权项

1. A visible-light-responsive photocatalytic fine particle dispersion comprising two types of titanium oxide fine particles dispersed in an aqueous dispersing medium, the two types being (i) titanium oxide fine particles containing a peroxotitanium component, a tin component, and a transition metal component for enhancing visible light response, and (ii) titanium oxide fine particles containing a peroxotitanium component and a copper component,
wherein in the titanium oxide fine particles (i), the transition metal of the transition metal component for enhancing visible light response is selected from among vanadium, molybdenum, and chromium.