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首页> 外文期刊>Theoretical and Experimental Chemistry >Ba2SnO4-A NEW PHOTOCATALYST FOR THE REDUCTION OF CHROMATE IONS
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Ba2SnO4-A NEW PHOTOCATALYST FOR THE REDUCTION OF CHROMATE IONS

机译：Ba2SnO4-一种新型的还原铬离子的光催化剂

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摘要

The photoelectrochemical properties of perovskite Ba2SnO4 were studied for the first time. This material has direct optical transitions with energy 3.18 eVdue to electron transfer O~2~2p → Sn~(4+)5s. The Mott-Schottky plots obtained in acidic media (pH≈ 2.5) indicate that this material has n-type conductivity and electron density 1.14-10~(17) cm~(-3). The conduction band potential of Ba2SnO4 (-0.86 V_(sce)) is located in a more negative region than the reduction potential ofHCrO4~-, which permits reduction of this anion to Cr~(3+) upon the action of UV light. The photoreduction is described in the framework of the Langmuir-Hinshelwood model by a pseudo-first-order kinetic equation. Irradiation of reaction mixtures by sunlight for ~2 h leads to the conversion of 73% (50ppm) chromate anions with 0.13% quantum yield.
机译：首次研究了钙钛矿Ba2SnO4的光电化学性质。由于电子转移O〜2〜2p→Sn〜（4+）5s，该材料具有直接的光跃迁，能量为3.18 eV。在酸性介质（pH≈2.5）下得到的Mott-Schottky图表明该材料具有n型电导率，电子密度为1.14-10〜（17）cm〜（-3）。 Ba2SnO4的导带电势（-0.86 V_（sce））比HCrO4〜-的还原电势位于更负的区域，这使得该阴离子在紫外线的作用下还原为Cr〜（3+）。在伪朗一级动力学方程中，在Langmuir-Hinshelwood模型的框架中描述了光还原。阳光下将反应混合物辐照〜2 h导致转化率为73％（50ppm）的铬酸根阴离子，量子产率为0.13％。

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