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首页> 外文期刊>Applied Surface Science >New Bi_2O_3-ZnO composite deposited on glass wool. Effect of the synthesis method on photocatalytic efficiency under visible light
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New Bi_2O_3-ZnO composite deposited on glass wool. Effect of the synthesis method on photocatalytic efficiency under visible light

机译：新的Bi_2O_3-ZnO复合材料沉积在玻璃棉上。 合成方法对可见光下光催化效率的影响

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摘要

In this study, a comparison between two methods of synthesis of Bi2O3-ZnO composite deposited on glass wool (GW) was conducted via the layered double hydroxide (LDH) synthesis route followed by treatment at 450 degrees C. The obtained materials were characterized by TGA, XDR, SEM, BET, XPS and UV-visible DRS. Characterization results showed two structures identified as LDH and (BiO)(2)CO3 with and without GW before heat treatment. Bi2O3-ZnO composite was obtained after treatment at 450 degrees C; however, solvothermal synthesis with GW would appear to be better than that of hydrothermal. Indeed, the material prepared by solvothermal with GW then treated at 450 degrees C has good crystallinity, high specific surface and lowest band gap energy compared to materials synthesized by hydrothermal. Furthermore, this material showed photocatalytic efficiency of 20 min for a total discoloration of the indigo carmine (IC), this was the best time of discoloration obtained compared to other materials and others from the literature. Identification of the responsible species for the photo-discoloration was conducted and the result showed that the species responsible for the dye discoloration was the radical superoxide anion with a small contribution of the e(-)/h(+) pair. It appears that the hydroxyl radical didn't contribute in this discoloration mechanism.
机译：在该研究中，通过层状双氢氧化物（LDH）合成途径进行沉积在玻璃棉（GW）上的两种合成方法的比较，然后在450℃下处理。通过TGA以所得的材料为特征，XDR，SEM，BET，XPS和UV可见DRS。表征结果表明，在热处理之前，具有和不具有GW的LDH和（BIO）（2）CO3的两种结构。在450℃处理后获得Bi2O3-ZnO复合材料;然而，具有GW的溶剂热合成似乎优于水热量。实际上，与通过水热合成的材料相比，在450摄氏度下用溶剂和GW处理的材料具有良好的结晶度，高比表面和最低带隙能量。此外，这种材料显示出20分钟的光催化效率，用于靛蓝胭脂红（IC）的总变色，这是与其他材料与文献中的其他材料相比获得的最佳变色时间。进行了对光变色的负责物种的鉴定，结果表明，负责染料变色的物种是具有E（ - ）/ H（+）对的小贡献的自由基超氧化物阴离子。似乎羟基自由基在这种变色机制中没有贡献。

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