Enhanced visible light photocatalytic oxidative desulfurization by BiOBr-graphene composite
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摘要: 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H2O2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.Abstract: 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 (H2O2) 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.
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Key words:
- BiOBr-graphene /
- photocatalytic oxidation /
- DBT /
- desulfurization
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Figure 2 SEM images of obtained samples
(a): BiOBr; (b): BRG1; (c): BRG2; (d): BRG3; (e): TEM image of BRG2
Figure 6 Effect of different catalysts on desulfurization performance
V (model oil)=20 mL, m (catalyst)=0.2 g, O/S (mol ratio)=6, t=60 ℃
Figure 7 Effect of different O/S mol ratioon desulfurization performance
V (model oil)=20 mL, m (BRG2)=0.2 g, t=30 ℃, ■: O/S (mol ratio)=5:1, ●: O/S (mol ratio)=6:1, ▲: O/S (mol ratio)=7:1
Figure 8 Effect of different S-compounds on desulfurization performance
V (model oil)=20 mL, m (BRG2)=0.2 g, O/S (mol ratio)=6, t=60 ℃, t=2 h
Figure 9 Illustration of the photocatalytic oxidation of DBT with oxidants and catalyzed by BRG2
Table 1 Effect of reaction temperature on desulfurization performance
Reaction
temperature t/℃Sulfur removal
efficiency η/%40 78.8 50 90.4 60 98.5 70 95.2 V (model oil)=20 mL, m (BRG2)=0.2 g, O/S (mol ratio)=6, t=2 h 
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