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首页> 外文期刊>Journal of materials science >A promising strategy to fabricate the Cu/BiVO_4 photocatalysts and their enhanced visible-light-driven photocatalytic activities
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A promising strategy to fabricate the Cu/BiVO_4 photocatalysts and their enhanced visible-light-driven photocatalytic activities

机译：一种有前景的制备Cu / BiVO_4光催化剂的策略及其增强的可见光驱动的光催化活性

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摘要

Cu/BiVO_4 photocatalysts with high photore-sponse are successfully synthesized by a one-step microwave hydrothermal method. The phase structure, morphology and optical absorption properties of the as-obtained photocatalysts are well characterized by XRD, SEM, TEM, EDS, DRS, BET and electrochemical analyses, as well as some associated data fitting methods. The results show that the doping of Cu~(2+) doesn't change the phase structure of BiVO_4 (C2/c:c3) but leaves certain effects on their lattice parameters. Furthermore, the DRS spectra reveal a significant red shift from 521 to 550 nm and a decrease band gap values from 2.22 to 2.09 eV, suggesting their improved optical absorption in the long wavelength region. The photocatalytic results show that a greatly promoted carrier separation rate due to the electron transition of Cu~(2+) with the doping ratio of 2 % can help to improve the degradation rate reaching the highest 87 % within 210 min under the visible light. Moreover, the recycling experiment for four entire circles demonstrates that the as-synthesized photocatalyst has a high structural stability in using.
机译：通过一步微波水热法成功合成了具有高光响应的Cu / BiVO_4光催化剂。通过XRD，SEM，TEM，EDS，DRS，BET和电化学分析以及一些相关的数据拟合方法，可以很好地表征所获得的光催化剂的相结构，形态和光吸收特性。结果表明，Cu〜（2+）的掺杂不会改变BiVO_4（C2 / c：c3）的相结构，但对其晶格参数有一定影响。此外，DRS光谱显示了从521 nm到550 nm的明显红移，并且带隙值从2.22 eV减小到2.09 eV，表明它们在长波长区域的光吸收有所改善。光催化结果表明，掺杂量为2％的Cu〜（2+）的电子跃迁引起的载流子分离率大大提高，可以改善可见光下210min内降解率达到最高的87％。此外，对整个四个循环的再循环实验表明，所合成的光催化剂在使用中具有很高的结构稳定性。

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  • 来源
    《Journal of materials science》 |2016年第3期|2394-2403|共10页
  • 作者

    Ping Chen;

  • 作者单位

    School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, 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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  • 正文语种 eng
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