吡啶环改性石墨相氮化碳光催化还原Cr(VI)的研究

以三聚氰胺和吡啶二羧酸为原料,通过水热合成有机大分子前驱体,设计了吡啶环改性的石墨相氮化碳(x% Py-CN).利用TEM、XRD、XPS、FT-IR、EIS等手段对所得x% Py-CN催化剂进行表征分析.以水中Cr (VI)为目标污染物,考察了x% Py-CN催化剂的光催化还原性能.结果表明,在模拟太阳光照射下,10% Py-CN具有最佳的光催化性能,光照3h对15mg/L Cr (VI)光催化还原率达85%.x% Py-CN催化剂光催化活性提升的原因在于,吡啶环的修饰有效提高了光生电子空穴对的分离效率.此外,重复循环实验表明该催化剂具有良好的稳定性和循环利用能力,具有良好的应用前景.

Photocatalytic reduction of Cr(VI) by pyridine doped graphitic carbon nitride

In this paper, melamine and pyridine dicarboxylic acid were used to synthesis organic macromolecule precursors by hydrothermal synthesis, and graphitic carbon nitride (x% py-CN) modified with pyridine was designed. The x% py-CN catalysts were characterized by TEM, XRD, XPS, FT-IR and EIS. The photocatalytic reduction performance of x% py-CN catalyst was investigated by using Cr(VI) as the target pollutant. The results showed that 10% Py-CN had the best photocatalytic performance under simulated sunlight, and the photocatalytic reduction rate of 15mg/L Cr(VI) reached 85% under 3h irradiation. The improvement of the photocatalytic activity of catalysts was attributed to the fact that the modification of pyridine could effectively improve the separation efficiency of photogenerated electron hole pairs. In addition, the repeated cycle experiment showed that the catalyst has good stability and recycling ability, and had a good application prospect.