溴氧化铋/石墨烯可见光下光催化氧化脱硫的研究

摘要

A series of BiOBr-graphene photocatalysts was synthesized using hydrothermal method, and were characterized by X-ray diffraction (XRD), scanning electron microscopy ( SEM), transmission electron microscopy ( TEM), Raman spectroscopy, ultraviolet-visible diffuse reflection spectroscopy ( DRS) and photoluminescence ( PL) emission spectroscopy. The photocatalysts were evaluated for photocatalytic oxidative desulfurization of model oil. The optimal temperature, graphene loading and the amount of hydrogen peroxide ( H2 O2 ) were investigated. The oxidation reactivity of the different sulfur compounds was found to be in the order of DBT>4, 6-DMDBT>BT. Moreover, the mechanism of photocatalytic oxidation of DBT by BiOBr-graphene was proposed based on the present experimental results.%采用水热法制备了BiOBr/石墨光催化剂,并利用X射线衍射( XRD)、扫描电镜( SEM)、透射电镜( TEM)、固体荧光( PL)和紫外-可见漫反射光谱( UV-vis DRS)等方法对其进行表征。以二苯并噻吩的环己烷溶液为模拟油品,考察反应温度、石墨烯负载量和氧化剂H2 O2用量等条件对BiOBr/石墨光催化氧化脱除模拟油中DBT的性能的影响,不同模型化合物的光催化活性为DBT>4,6-DMDBT>BT,根据实验结果提出了BiOBr/石墨光催化剂氧化DBT的机理。