EFFECT OF Nd 3+ ON STRUCTURE AND PHOTOCATALYTIC ACTIVITY OF NANOSIZED Nd-TiO2 OWDERS SYNTHESIZED BY HYDROTHERMAL AND HYDROLYSIS METHODS
Nd-doped TiO2 and TiO2 without Nd 3+ powders were prepared by hydrothermal and hydrolyzing TiOSO4 solution with the presence of urea. Characterizations of the these products were determined by XRD, UV-VIS, TEM and BET methods. The results showed that the addition of Nd 3+ ion caused an improvement of crystality, a decrease of the particle size, an increase of the surface area, and it prevented phase transition from anatase to rutile and enhanced the photo-adsorption under visible light of TiO2. The sample Nd-TiO2 with molar ratio Nd/TiO2 was 25 × 10-3 % in both the two methods were of single anatase phase, small particle size (~ 7 nm in hydrothemal and ~ 31 nm in hydrolysis) and the yield of photo-degradtion
methylene blue aquous solution 1,4 times higher than the sample without doping. The Nd-TiO2 sample prepared by hydrothermal method had the photo-degradtion yield better than the sample prepared by hydrolysis method with 98,48 % during 1,5 h irradiation for the hydrothermal method and 95,84 % during 2 h irradiation for the hydrolysis.