Abstract: Modified Ce-TiO2 micropowder were synthesized by microwave-assisted hydrothermal method with homemade Ce-doped titania nanopowder and were characterized by X-ray diffraction ( XRD ) , scanning electron microscopy ( SEM ) , nitrogen adsorption ( BET ) , and UV-visible ( UV-Vis ) diffuse reflectance spectroscopy .The results show that modified Ce-TiO2 micropowder has high porosity , the average pore diameter is 153.4 nm and the specific surface area is 154.9 m2/g.Ce-doping has little effect on the structure of the micropowder , but it can enlarge the ability of TiO 2 for absorbing visible light , which shiftes absorption edge of TiO 2 reaching the visible region .At the same time Ce-doping effectively inhibits grain growth, hinders the crystal type transform of TiO 2 from anatase to rutile. High-Porosity Ce-TiO2 micropowder meets good visible light catalytic activity in low concentration formaldehyde solution .

Key words: Ce-TiO2;photocatalysis;high porosity;microwave method;formaldehyde