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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >A new photocatalyst of LuFeO3 for the dye degradation
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A new photocatalyst of LuFeO3 for the dye degradation

机译：新型的LuFeO3光催化剂用于染料降解

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A polyacrylamide gel route was introduced to synthesize LuFeO3 particles, where the effects of calcination temperature, calcination time and chelating agent on the products were investigated. By varying the experimental conditions, several LuFeO3 samples with sphere-, ellipsoid- and worm-like morphologies and average particle sizes of 200-270 nm were prepared. The photocatalytic activity of LuFeO3 samples was evaluated by degrading rhodamine B (RhB) under simulated-sunlight irradiation, revealing that they exhibit a pronounced photocatalytic activity. The effects of p-benzoquinone (BQ), ethanol and oxalic acid (OA) on the photocatalytic efficiency were investigated. It is observed that BQ has almost no effect on the photocatalytic degradation of RhB, ethanol exhibits a substantial suppression of RhB degradation, while OA significantly enhances the photocatalytic efficiency. Hydroxyl ((OH)-O-center dot) radicals were examined by fluorimetry using terephthalic acid as a probe molecule, and are found to be produced over the simulated-sunlight irradiated LuFeO3 particles. The addition of ethanol leads to a quenching of (OH)-O-center dot radicals, whereas the yield of (OH)-O-center dot radicals is highly increased on addition of OA. Based on the experimental results, (OH)-O-center dot radicals are suggested to be the dominant active species responsible for the dye degradation, while superoxide (O-center dot(2)-) radicals play a negligible role in the photocatalysis.
机译：引入聚丙烯酰胺凝胶法合成LuFeO3颗粒，研究了煅烧温度，煅烧时间和螯合剂对产物的影响。通过改变实验条件，制备了具有球形，椭圆形和蠕虫状形态且平均粒径为200-270 nm的LuFeO3样品。通过在模拟阳光照射下降解若丹明B（RhB）评估LuFeO3样品的光催化活性，表明它们表现出显着的光催化活性。研究了对苯醌（BQ），乙醇和草酸（OA）对光催化效率的影响。观察到BQ对RhB的光催化降解几乎没有影响，乙醇显示出对RhB降解的显着抑制，而OA则显着提高了光催化效率。使用对苯二甲酸作为探针分子，通过荧光法检查了羟基（（OH）-O-中心点）自由基，发现该自由基是在模拟阳光照射下的LuFeO3颗粒上产生的。乙醇的添加导致（OH）-O-中心点自由基的猝灭，而（OH）-O-中心点自由基的产率随着OA的增加而大大增加。根据实验结果，建议（OH）-O-中心点自由基是负责染料降解的主要活性物质，而超氧化物（O-中心dot（2）-）自由基在光催化中的作用可忽略不计。

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