Research On Synthesis, Characterization And Photocatalytic Degradation Of Direct Violet 102 By Sm₂BiTaO₇

Photocatalytic degradation technology is an emerging technology in the field of solar energy utilization,which has got more and more attention of people.Because of its advantages of high efficiency, energy saving and no secondary pollution, it has a broad prospect of application in dealing with unbiodegradable organic matters. and the current photocatalytic technology research focus mainly on the modification of traditional photocatalyst and the new photocatalysts which can absorb the visible light.In this paper, Sm₂BiTaO₇ was synthesized by the traditional high temperature solid phase sintering method, and Sm₂O₃, Bi₂O₃ and Ta₂O₅ was the raw materials.the successfully synthesized catalyst Sm₂BiTaO₇ was characterized by XRD, UV-vis, FTIR, SEM, EDS, TEM, SAED, XPS, BET and Zeta potential.And the test result showed that Sm₂BiTaO₇ was cubic fluorite structure, with a space group of 225 Fm3m, and it had a Sm40 regular tetrahedron and Ta （Bi） O₆ octahedral structure. The Sm₂BiTaO₇ sample was irregular granular, and it had a small specific surface area. The Sm₂BiTaO₇ sample showed a strong optical absorption in the visible light region with a band gap of 2.42 eV.In visible light catalytic degradation experiments, Direct Violet 102 was used as the pollutants, and The effects of synthetic contidion, photocatalyst loading, initial concentration of Direct Violet 102, the pH value and the effect of coexisting ions on the photocatalytic degradation efficiency were studied in detail. In addition, by adding different scavengers which can eliminate relevant active groups, the photocatalytic degradation mechanism of Direct Violet 102 was studied.And the results showed that of O₂ is crucial for the photocatalytic degradation Direct Violet 102 by Sm₂BiTaO₇.