磷和硼共掺杂石墨相氮化碳的制备及其光催化性能研究

Study on Phosphorus and Boron Codoped Graphitic Carbon Nitride and Its Photocatalytic Properties

以磷酸钠为磷源,以氧化硼为硼源,采用元素掺杂法对石墨相氮化碳进行非金属元素共掺杂,以此来提高其对有机污染物的降解效率。分析测试结果表明:2种元素的共同掺杂使石墨相氮化碳在可见光范围内的响应能力增强,从而提高了样品对可见光的利用效率。此外,共掺杂还能够减小样品的能带宽度,抑制光生电子和空穴的复合效应,进而提高样品的光催化活性。两元素共掺杂的样品对罗丹明B具有良好的降解稳定性和循环使用性,其光催化降解速率是纯石墨相氮化碳的59.2倍。

Graphitic carbon nitride was co-doped with non-metallic elements using sodium phosphate as phosphorus source and boron oxide as boron source,so as to improve its degradation efficiency of organic pollutants.The results show that the co-doping of the two elements enhances the response ability of the graphitic carbon nitride in the visible light range,thus improving the utilization efficiency of the sample to the visible light.In addition,co-doping can also reduce the band width of the sample,inhibit the recombination effect of photogenerated electrons and holes,and improve the photocatalytic activity of the sample.The photocatalytic degradation rate of Rhodamine B was 59.2times higher than that of pure graphitic carbon nitride.