二维石墨相氮化碳纳米片的制备及其光催化性能

Preparation of 2D graphite phase carbon nitride nanosheets and their photocatalytic performance

摘要:

摘要：利用水热反应法，将三聚氰胺悬浊液在200 ℃下反应生成中间产物，然后煅烧中间产物直接制成了二维石墨相氮化碳g-C3N4纳米片（WCN），并与本体g-C3N4(CN)、传统热氧剥离法得到的g-C3N4纳米片（OCN）进行了比较。采用SEM、XRD、FTIR、Raman、AFM、PL仪等对催化剂进行了表征，探讨了催化剂的光电化学性能和光催化性能。结果表明：两种方法均实现了对CN的剥离，WCN和OCN二维纳米片与CN 晶体结构和组成相同，WCN和OCN的比表面积分别是CN的4倍和3倍。光电化学分析显示WCN有更好的载流子的迁移与分离效率，具有较好的光催化活性。在可见光条件下，WCN对亚甲基蓝（MB）的光催化降解率达到82％，分别是OCN和CN的2.4 倍和6.7 倍，光催化降解过程符合一级动力学方程。WCN具有优良的稳定性和可重复利用性能。

Abstract:

Abstract：The hydrothermal reaction method is used to react the melamine suspensionat 200 ℃ to produce an intermediate product.The intermediate product is then calcined to directly produce a two-dimensional Graphite phase carbon nitride g-C3N4 nanosheet (WCN), which is stripped from the bulk g-C3N4 (CN) and the g-C3N4 nanosheets (OCN) obtained by the traditional thermal oxygen method were compared.The catalysts were characterized by SEM, XRD, FTIR,Raman,AFM and PL instruments, and the photoelectrochemical and photocatalytic properties of the catalysts were discussed.The results show that both methods achieve CN peeling.The two-dimensional nanosheets of WCN and OCN have the same crystal structure and composition as CN. The specific surface areas of WCN and OCN are 4 and 3 times that of CN, respectively.Photoelectrochemical analysis shows that WCN has better carrier migration and separation efficiency, and has better photocatalytic activity.Under visible light, the photocatalytic degradation rate of methylene blue (MB) by WCN reached 82 %, which was 2.4 and 6.7 times that of OCN and CN, respectively. The photocatalytic degradation process conforms to the first-order kinetic equation.WCN has excellent stability and reusability.