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A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure optical property and photocatalytic activity

机译:一种新型的Bi基可见光敏感型光催化剂BiLa1.4Ca0.6O4.2:晶体结构光学性质和光催化活性

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摘要

A new compound of BiLa1.4Ca0.6O4.2 is synthesized through solid state reaction, where the Ca substitutes, in part, the La site in a stable BiLa2O4.5 phase. The structure of the BiLa1.4Ca0.6O4.2 crystallizes in space group R3mH with a hexagonal lattice constants of a = 3.893(1) Å, c = 9.891(1) Å. Its optical absorption edge is about 2.05 eV, which just spans the visible light region. The photocatalytic activity of the BiLa1.4Ca0.6O4.2 powder to degradation of RhB under visible light irradiation is measured and improved more than 7 times by annealing in nitrogen ambient, indicating that annealing in nitrogen can effectively improve the photocatalytic activity by producing oxygen vacancy. Although the absolute photocatalytic activity obtained is low, there is great potential for enhancing the activity such as nanoscaling, doping, and coupling with other compounds.
机译:通过固相反应合成了一种新的BiLa1.4Ca0.6O4.2化合物,其中Ca在稳定的BiLa2O4.5相中部分取代了La位点。 BiLa1.4Ca0.6O4.2的结构在空间群R3mH中以a = 3.893(1)Å,c = 9.891(1)a的六方晶格常数结晶。它的光吸收边缘约为2.05 eV,仅跨越可见光区域。通过在氮气环境中进行退火,测定了BiLa1.4Ca0.6O4.2粉末对可见光辐照下RhB降解的光催化活性,并将其提高了7倍以上,这表明在氮气中进行退火可以通过产生氧空位来有效提高光催化活性。 。尽管获得的绝对光催化活性低,但是具有增强活性的巨大潜力,例如纳米尺度,掺杂和与其他化合物的偶联。

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