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首页> 外文期刊>Journal of Materials Research >Thermostability and photocatalytic performance of BiOCl_(0.5)Br_(0.5) composite microspheres
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Thermostability and photocatalytic performance of BiOCl_(0.5)Br_(0.5) composite microspheres

机译：BiOCl_（0.5）Br_（0.5）复合微球的热稳定性和光催化性能

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摘要

Novel 1-1.5 μm BiOCl_(0.5)Br_(0.5) composite microspheres were prepared by coprecipitation method, then calcined at different temperatures. The BiOCl_(0.5)Br_(0.5) samples before and after calcination were characterized by powder x-ray diffraction, thermogravimetric analysis, N_2-physical adsorption, scanning electron microscopy, Fourier transformed infrared spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of Rhodamine B under visible light irradiation. The results showed that the thermostability of BiOClo.5Br0.5 composite microspheres is lower than BiOCl and higher than BiOBr. Heat treatment at low 500 ℃ could obviously improve the crystallinity of BiOCl_(0.5)Br_(0.5) microspheres, resulting in a significant increase in activity. BiOCl_(0.5)Br_(0.5) microspheres calcined at 450 ℃ displayed the highest activity and stability. At elevated temperature calcination (600-800 ℃), phase transition occurred over BiOCl_(0.5)Br_(0.5). Br element was gradually lost and new phase of Bi_(24)O_(31)Br_(10) appeared. High temperature calcination did not change the morphology of BiOCl_(0.5)Br_(0.5), but the surface area and surface OH groups decreased, which resulted in a large decrease in activity.
机译：采用共沉淀法制备了新型的1-1.5μmBiOCl_（0.5）Br_（0.5）复合微球，然后在不同温度下煅烧。通过粉末X射线衍射，热重分析，N_2物理吸附，扫描电子显微镜，傅立叶变换红外光谱和UV-Vis漫反射光谱对BiOCl_（0.5）Br_（0.5）样品的煅烧前后进行了表征。通过在可见光照射下若丹明B的光催化降解来评估样品的光催化活性。结果表明，BiOClo.5Br0.5复合微球的热稳定性低于BiOCl，高于BiOBr。在500℃的低温下进行热处理可以明显改善BiOCl_（0.5）Br_（0.5）微球的结晶度，从而显着提高活性。在450℃下煅烧的BiOCl_（0.5）Br_（0.5）微球表现出最高的活性和稳定性。在高温煅烧（600-800℃）下，BiOCl_（0.5）Br_（0.5）发生相变。 Br元素逐渐消失，Bi_（24）O_（31）Br_（10）的新相出现。高温煅烧并没有改变BiOCl_（0.5）Br_（0.5）的形貌，但表面积和表面OH基团减少，导致活性大大降低。

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  • 来源
    《Journal of Materials Research》 |2015年第20期|3125-3133|共9页
  • 作者

    Wen Fang; Changlin Yu; Jiade Li; Wanqin Zhou; Lihua Zhu;

  • 作者单位

    School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, People's Republic of China;

    School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, People's Republic of China;

    School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, People's Republic of China and State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, Fujian, People's Republic of China;

    School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, People's Republic of China;

    School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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