BiVO4/SBA-15光催化氧化苯乙烯制苯甲醛

为提高BiVO4的光催化活性,通过浸渍法将BiVO4负载于SBA-15介孔分子筛上合成BiVO4SBA-15催化剂,采用X射线衍射(XRD)、N2吸附-脱附等手段对合成催化剂结构进行表征;在400W金卤灯照射下,以BiVO4SBA-15为催化剂进行苯乙烯氧化反应,考察反应条件对氧化性能的影响。结果表明:BiVO4的负载未破坏SBA-15的介孔结构,且均匀分散在其表面;与BiVO4催化剂相比,BiVO4SBA-15的光催化活性有显著提高,在反应温度为70℃、反应时间为2.5h、n(苯乙烯)∶n(丙酮)∶n(过氧化氢)=1∶2∶3.5、m(BiVO4SBA-15)∶m(苯乙烯)=10%的光催化条件下,苯乙烯转化率达到90.31%,苯甲醛选择性达到70.65%。

PHOTOOXIDATION OF STYRENE TO BENZALDEHYDE BY BIVO4/SBA-15 PHOTOCATALYST

In order to improve the photocatalytic activity of BiVO4， BiVO4/SBA-15 photocatalyst was prepared by impregnation method of BiVO4 loaded on SBA-15 mesoporous molecular sieve. The samples were characterized and analyzed by XRD，N2 adsorption-desorption and FT-TR techniques. Under the irradiation of 400 W metal halide lamps, the oxidation of styrene was conducted with BiVO4/ SBA-15 and BiVO4 as catalyst to investigate the influence of reaction conditions on the oxidation performance. The results showed that the load of BiVO4 did not destroy the mesoporous structure of SBA-15 and it uniformly dispersed on the surface and that BiVO4/SBA-15 photocatalytic activity was significantly improved compared with BiVO4. The conversion of styrene and the selectivity of benzaldehyde reached 90.31% and 70.65%, respectively when Styrene:Acetone:Hydrogen peroxide (molar ratio)= 1: 2: 3.5, reaction temperature 70℃ and reaction time 2.5 h.