石墨相氮化碳的制备条件优化用以提高其在可见光下的光催化活性

通过染料的光降解实验和敏感性数学分析探讨了石墨相氮化碳(g-C₃N₄)的制备条件与其稳定性和光催化活性之间的联系. 结果表明,相比于焙烧时间,焙烧温度的改变更为显著地影响了g-C₃N₄ 的光催化活性. 制备条件优化之后的g-C₃N₄在可见光照射下催化降解罗丹明B(RhB)的活性比未优化时提高了约100倍,归因于材料比表面积的增大和表面光生电子-空穴迁移速度的增强.

Photocatalytic Activity Improvement of g-C3N4 under Visible Light by Optimizing Preparation Conditions

Graphite-like C₃N₄ (g-C₃N₄) is ané cient visible-light-driven photocatalyst which is com-monly used in pollutant degradation. The photoreactivity of g-C₃N₄ depends on the prepa-ration conditions to a large extent. In this work, we linked the preparation conditions of g-C₃N₄ to its stability and photocatalytic activity through dye photodegradation experi-ments and sensitivity mathematical analyses. The sensitivity mathematical analyses show that the effect of calcination temperature is more significant than calcination time on the photoreactivity of g-C₃N₄. The photocatalytic activity of optimized g-C₃N₄ in rhodamine B (RhB) degradation under visible light was 100 times higher than that of non-optimized one. The enhanced performance can be attributed to the increased specific surface area of g-C₃N₄ and the increased migration velocity of photogenerated electron-hole pairs on the surface. This work deepens the understanding of the relation between preparation conditions and the charateristics of g-C₃N₄, and provides an extremely simple method for significantly improving the photoreactivity of g-C₃N₄.