Photo-catalytic Ni/Co co-doped TiO2 nanoparticles for glazedCeramic Tiles

Self-cleaning and anti-bacterial activities of the photo-catalyst titanium dioxide make it a superiorcompound for use in the ceramics and glass industry. In order to achieve high self-cleaning efficiency forbuilding products, it is important that Titania is present as anatase phase. Moreover, it is desirable that theparticle sizes are in Nano-range, so that a large enough surface area is available for enhanced catalyticperformance. In the present paper, Cobalt and Nickel co-doped (4%mol Ni and 4%mol Co doped TiO2)and un-doped TiO2 Nano powders have been prepared by sol–gel technique and calcinated at temperaturesranging from 475°C to 1075°C. Ni/Co co-doped TiO2, postponed the anatase to rutile transformation ofTiO2 by about 200C, such that after calcination at 775 C, no rutile was detected for 4 mol% Ni/Co codopedTiO2. A systematic decreasing on crystallite size and increasing on specific surface area of Ni/Coco-doped TiO2 were observed. Photo-catalytic activity of anatase polymorph was measured by thedecomposition rate of methylene blue under sunlight illumination. The results showed enhanced catalysisunder visible light for Ni/Co co-doped TiO2 as compared to pure TiO2. The enhanced performance wasattributed to surface chemistry change associated with a slight shift in the band gap.

کلیدواژه های Photo-catalytic Ni/Co co-doped TiO2 nanoparticles for glazedCeramic Tiles:

Ni/Co co-doped TiO2 ، Anatase ، Optical band gap energy ، Structural properties