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TiO 2 , and ATiO 3 (A = Fe , Co, Ni ) is an important semiconductor material , the nanocrystals in photocatalysis, electronics , and magnetic fields important application prospects . In this study, the use of homogeneous precipitation synthesis of the corresponding precursor precipitate nanocrystals material obtained after calcination synthesis of nanocrystalline photocatalytic performance test and analysis . Homogeneous precipitation method by controlling the rate of hydrolysis of urea , easily synthesized by homogeneous precipitation . The study found that acidic solution and transition element ions ( Ti 4 < / sup> Fe 3 < / sup> Co 2 < / sup> Ni 2 ) to join, there are varying degrees increased urea hydrolysis rate , shorten the reaction time . Thermogravimetric differential analysis ( TG- DSC ) , X - ray diffraction ( XRD ) , transmission electron microscopy (TEM), and pore size analyzer , UV - visible diffuse reflectance analysis testing means the performance of the product structure , morphology and photocatalytic activity characterized. In this study, homogeneous precipitation Synthesis of precipitation , precipitation in the 800 ° C calcined 6h were prepared Fe 2 TiO 5 < / sub > CoTiO 3 NiTiO 3 and other nanocrystals , as well as a control sample TiO 2 nanocrystals synthesized samples less lattice defects and crystallite size of 100nm . And the pure TiO 2 nanocrystals , the transition elements Fe , Co, Ni doping ATiO 3 ( A = Fe , Co, Ni ) nanocrystals the specific surface area of the sample were decreased . This study tested the catalytic activity of the preparation of the nanocrystalline samples in the UV Degradation of Methylene Blue solution . Although the samples lower photocatalytic activity under ultraviolet light , UV-Vis spectra show the the synthesis of ATiO 3 ( A = Fe , Co , Ni ) nanocrystals samples optical absorption peak occurs redshift , i.e. its light absorption range extended to the visible region , the energy band gap also are reduced .
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