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La and F co-doped Bi2MoO6 architectures with enhanced photocatalytic performance via synergistic effect

机译：LA和F共掺杂Bi2Moo6架构，通过协同效应增强光催化性能

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摘要

Novel La and F co-doped Bi2MoO6 architectures were first successfully synthesized via a facile solvothermal process, and characterized using XRD, SEM, TEM/HR-TEM, XPS, EDS, UV-Vis DRS and PL spectra. The enhanced photocatalytic activities of La and F co-doped Bi2MoO6 architectures were evaluated by the photodegradation of rhodamine B (RhB) under visible-light irradiation. The results demonstrated that the F-1.0 at% La-Bi2MoO6 photocatalyst exhibits significantly enhanced photocatalytic activity, which is 6.54 times higher than that of pure Bi2MoO6. The cause can be attributed to the co-incorporation of La and F into Bi2MoO6 broadening the absorption in the visible-light region and thereby leading to the formation of new energy levels on top of the valence band of F-La-Bi2MoO6, and on the other hand, the synergistic effect of F and La, in which F doping led to the increase of absorptivity of F-Bi2MoO6 and acted as an n-type impurity to supply a hole carrier. The doped La3+ ions act in a key role to capture and transfer/release the photogenerated electrons for conversion from O-2 to center dot O-2(-) to delay the recombination of the photogenerated electrons and holes, greatly suppressing the recombination of photogenerated electron-hole pairs and thus significantly improving photocatalytic activity in RhB photodegradation. The radical capture experiment confirmed that h(+) and center dot O-2(-) were the main active species and were responsible for RhB photodegradation. Moreover, on the basis of the PL spectra, active species trapping detection and photocurrent response experiments, the mechanism of the enhanced photocatalytic activity for F-La-Bi2MoO6 was proposed.
机译：首先通过容易的溶剂热处理成功地合成新型LA和F共掺杂BI2MOO6架构，并使用XRD，SEM，TEM / HR-TEM，XPS，EDS，UV-VIS和PL光谱来表征。通过在可见光照射下的罗丹明B（RHB）的光降解来评估LA和F共掺杂BI2MOO6架构的增强的光催化活性。结果证明，％La-Bi2Moo6光催化剂的F-1.0表现出显着增强的光催化活性，比纯Bi2moo6高6.54倍。原因可以归因于La和F的共同掺入Bi2moo6扩展可见光区域中的吸收，从而导致在F-la-Bi2moo6的价带顶部形成新的能量水平，以及另一方面，F和LA的协同效应，其中F掺杂导致F-Bi2Moo6的吸收性的增加，并用作提供孔载体的n型杂质。掺杂的La3 +离子在捕获和转移/释放光生电子中以从O-2转换为中心点O-2（ - ）以延迟光生电子和孔的重组，大大抑制光生的重组电子 - 孔对，从而显着改善RHB光降解中的光催化活性。自由基捕获实验证实H（+）和中心点O-2（ - ）是主要活性物质，并负责rHB光降解。此外，基于PL光谱，有源物质捕获检测和光电流响应实验，提出了F-LA-BI2MOO6的增强光催化活性的机理。

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  • 来源
    《RSC Advances》 |2016年第75期|共9页
  • 作者

    Wang Danjun; Shen Huidong; Guo Li; Wang Chan; Fu Feng; Liang Yucang;

  • 作者单位

    Yanan Univ Coll Chem &

    Chem Engn Shaanxi Key Lab Chem React Engn Yanan 716000 Peoples R China;

    Yanan Univ Coll Chem &

    Chem Engn Shaanxi Key Lab Chem React Engn Yanan 716000 Peoples R China;

    Yanan Univ Coll Chem &

    Chem Engn Shaanxi Key Lab Chem React Engn Yanan 716000 Peoples R China;

    Yanan Univ Coll Chem &

    Chem Engn Shaanxi Key Lab Chem React Engn Yanan 716000 Peoples R China;

    Yanan Univ Coll Chem &

    Chem Engn Shaanxi Key Lab Chem React Engn Yanan 716000 Peoples R China;

    Univ Tubingen Inst Anorgan Chem Morgenstelle 18 D-72076 Tubingen Germany;

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  • 中图分类 化学;
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