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Some of paper sludge ash(PS ash)contains TiO2which is used for pigment. This TiO2 has100~300nm of particle size and shows any little photocatalytic activity. PS ash containing nano sized TiO2 was obtained by three kinds of acid treatment(HCl,HNO3,H2SO4)after alkali hydrothermal reaction of PS ash. XRD analysis and SEM observation showed that crystal structure of TiO2 included in PS ash was anatase type and crystal size was10―14nm. BET surface area of PS ash containing nano sized TiO2was258~288m/g. Gaseous acetaldehyde removal experiment was carried out to evaluate photocatalytic activity of nano sized TiO2 in the PS ash. Nano sized TiO2 obtained by H2SO4 treatment have ability of decomposing acetaldehyde to carbon dioxide under UV irradiation, while untreated PS ash was able to decompose acetaldehyde any little.

Preparation of nano sized TiO2 from Paper Sludge Ash