Well-dispersed nano-anatase or bi-crystalline (anatase + brookite) titania powders with a average crystal size below 10 nm have been prepared from aqueous TiOCl2 solution by adjusting pH values of starting solution and adding different additives at low temperatures. Amorphous–anatase transformation of titania could proceed in a liquid–solid reaction at low temperatures, even around room temperature, by catalytic support of H+ ion. The presence of a small amount of SO2− 4ion is also unfavorable to the formation of both rutile and brookite. By carefully adjusting preparation conditions, nano pure anatase with higher surface area, good crystallinity and a very good photocatalytic activity for gas-phase oxidation of benzene was obtained.
Research on Chemical Intermediates – Springer Journals
Published: Jun 1, 2005
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