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以二氰二胺、巴比妥酸、Fe(NO3)3·9H2O和Zn(NO3)2·6H2O为原料,用水作溶剂,采用焙烧的方法合成了C3N4/Zn O/Fe2O3复合光催化剂;通过光致发光光谱对其进行了表征。用对苯二甲酸作为探针分子,结合荧光技术研究了C3N4/Zn O/Fe2O3复合光催化剂表面的羟基自由基形成。以甲基橙为光催化反应的模型化合物,评价了C3N4/Zn O/Fe2O3复合光催化剂的紫外光催化活性。结果表明:C3N4与Zn O/Fe2O3质量比率对C3N4/Zn O/Fe2O3复合光催化剂的光催化活性有重要的影响;当C3N4,Zn O和Fe2O3质量比率为10∶1.2∶12.9时所制得的C3N4/Zn O/Fe2O3复合催化剂的紫外光催化活性最好。羟基自由基生成速率的变化趋势与C3N4/Zn O/Fe2O3复合催化剂的光催化活性的变化趋势相吻合。C3N4/Zn O/Fe2O3复合光催化剂的光致发光光谱强度与它的光催化活性之间也有良好的对应关系。
In this paper, C3N4 / Zn O / Fe2O3 composite photocatalysts were synthesized by calcination using dicyandiamide, barbituric acid, Fe (NO3) 3 · 9H2O and Zn (NO3) 2 · 6H2O as raw materials. Photoluminescence spectra were characterized. The formation of hydroxyl radicals on the surface of C3N4 / Zn O / Fe2O3 composite photocatalyst was studied by using terephthalic acid as probe molecule and fluorescence technique. The photocatalytic activity of C3N4 / Zn O / Fe2O3 composite photocatalysts was evaluated using methyl orange as a photocatalyst. The results show that the mass ratio of C3N4 to Zn O / Fe2O3 has an important influence on the photocatalytic activity of C3N4 / Zn O / Fe2O3 composite photocatalyst. When the mass ratio of C3N4, Zn O and Fe2O3 is 10:1.2:12.9, The photocatalytic activity of C3N4 / Zn O / Fe2O3 composite photocatalyst is the best. The changing tendency of hydroxyl radical generation rate coincides with the change tendency of photocatalytic activity of C3N4 / Zn O / Fe2O3 composite catalyst. There is also a good correspondence between the photoluminescence intensity of C3N4 / Zn O / Fe2O3 composite photocatalyst and its photocatalytic activity.