电子受体H2O2和O2对TiO2光催化甘油氧化反应中活性氧物种1O2和OH•的影响

摘要

在室温条件下研究了电子受体H2O2和O2对TiO2光催化甘油氧化反应中的活性氧物种、甘油转化率和产物分布的影响。当在紫外光辐射和TiO2的体系中不存在电子受体时,只产生HO•自由基。而当在此体系中有电子受体存在时,则产生了HO•自由基和1O2,但它们的浓度不同,这取决于电子受体的浓度。以H2O2为电子受体时甘油转化率的提高大于以O2为电子受体时。甘油转化生成有价值产物的类型则与体系中的活性氧物种浓度有关。%The effect of the electron acceptors H2O2 and O2 on the type of generated reactive oxygen species (ROS), and glycerol conversion and product distribution in the TiO2‐catalyzed photocatalytic oxida‐tion of glycerol was studied at ambient conditions. In the absence of an electron acceptor, only HO·radicals were generated by irradiated UV light and TiO2. However, in the presence of the two elec‐tron acceptors, both HO·radical and 1O2 were produced by irradiated UV light and TiO2 in different concentrations that depended on the concentration of the electron acceptor. The use of H2O2 as an electron acceptor enhanced glycerol conversion more than O2. The type of generated value‐added compounds depended on the concentration of the generated ROS.