高比表面积氮化碳纳米片的制备及光催化性能

Preparation and Photocatalytic Performance of g-C_3N_4 Nanosheets with High Specific Surface Area

以双氰胺为前驱体、氯化铵为气相模板制备了具有高比表面积的g-C_3N_4纳米片,通过XRD、SEM、TEM、FTIR、BET、XPS对其形貌、晶型结构、带隙结构进行了表征,并评价了室温下g-C_3N_4纳米片对可见光降解高浓度罗丹明B水溶液的光催化活性。结果表明,氯化铵的添加对g-C_3N_4纳米片的形貌、比表面积、晶型结构、带隙结构和光催化活性影响显著,g-C_3N_4纳米片的光催化活性得到明显提高,其光催化速率常数为39.16×10^(-3 )min^(-1),为块体g-C_3N_4的2倍多。

Using dicyandiamide as a precursor,and ammonium chloride as a gas-phase template,we prepared g-C_3N_4nanosheets with high specific surface area.Moreover,we characterized the morphology,crystal structure,and band structure of g-C_3N_（4 ）nanosheets by XRD,SEM,TEM,FTIR,BET,and XPS,and evaluated the photocatalytic activity of g-C_3N_4nanosheets by degradation of concentrated RhB aqueous solution under visiblelight at ambient temperature.The results show that the addition of ammonium chloride has an obvious effect on the morphology,specific surface area,crystal structure,band structure,and photocatalytic activity of g-C_3N_4nanosheets.The photocatalytic activity of g-C_3N_（4 ）nanosheets obviously increases,and the photocatalytic rate constant is 39.16×10^（-3 ）min^（-1）,which is twice more than that of bulk g-C_3N_4.