WEI Yuan ¹, CHEN Xiaoge ², ZHANG Hongsong ³
（1.School of Materials and Chemistry Engineering, Henan Institute of Engineering, Zhengzhou 451191, Henan, China; 2. School of
Civil Engineering, Henan Institute of Engineering, Zhengzhou 451913, Henan, China; 3. School of Mechanical Engineering, Henan
Institute of Engineering, Zhengzhou 451191, Henan, China)

Abstract: The La₂LaTa₇ powders was synthesized successfully by solid state reaction method using La₂O₃ and Ta₂O₅ as reactants. The phasestructure,micromophology and element composition were analyzed by X-ray diffraction (XRD), electronic scanning microscope (SEM) and EDS patterns, respectively. Its average particle-size and specific surface area were investigated by laser particle-size analyzer and surface area analyzer, respectively. Its photocatalytic activity was evaluated by the degradation of of methylene blue under simulated solar irradiation over La₂LaTaO₇ powders. Results show that the pure La₂LaTaO₇ powder with single webrite structure was synthesized successfully, and the synthesized powder has a certain some agglomeration. Its average particle-size and specific surface area are 24 μm and 0.463 m²/g,respectively. After irradiation for 150 min, the photocatalytic degradation-rate of methylene blue under simulated solar irradiation over La₂LaTaO₇ powder is about 68 %, which may b attributed to its little specific surface area.

Key words: A₂B1³⁺B₂⁵⁺O₇ oxide; powder; photocatalytic activity