g-C_3N_4的制备及其对不同染料光催化降解性能研究

Simple synthesis of g-C_3N_4 catalyst for the photocatalytic degradation of different dyes

通过热聚合尿素的方法制备石墨相氮化碳(g-C_3N_4),用于对罗丹明B(RhB)、甲基橙(MO)、甲基红(MR)、亚甲基蓝(MB)、酸性红(AR)、刚果红(CR)等染料光催化降解。发现Rh B、MB两种染料基本降解完全,MO和AR的降解率在80%以上,CR和MR的降解效果较差,分别为68.3%和65.5%。与催化剂纳米二氧化钛P25比较,降解MO、MR、AR三种染料时,P25的催化效果要好于g-C_3N_4;对于Rh B、CR两种染料,P25和g-C_3N_4的降解效果相差不大,而对MB的降解,g-C_3N_4要好于P25。

Graphitic carbon nitride was synthesized by direct thermopolymerization of cheap urea. The structure,morphology,specific surface area and the light absorption of g-C3N4 was characterized. The activities of the g-C3N4 catalyst were tested in the photocatalytic degradation of Rhodamine B,methyl orange,methyl red,methylene blue,acid red and Congo red under UV light. It found that RhB,MB completely two kinds of basic degradation the degradation efficiency of MO and AR was over 80%,the CR and MR was 68. 3% and65. 5%,respectively. The photocatalytic activity of g-C3N4 has been investigated and compared with nanometer titanium dioxide P25. The results indicated that P25 exhibited higher photocatalytic activity than gC3N4 when degraded MO,MR,AR,the activity of two photocatalysts was similar when degraded RhB and CR,for MB,g-C3N4 exhibited better than P25.