摘要
本文系统地研究了由不同前驱体(尿素,双氰胺,三聚氰胺)制备的类石墨烯相氮化碳(g-C_3N_4)催化剂的催化效果与其结构和形貌的关系,实验结果表明,g-C_3N_4的聚合方式、聚合程度、质子化程度以及不同前躯体的堆积方式都会对光催化产氢效果产生影响。另外,为了深入探索g-C_3N_4基复合材料的光催化性能,文中将g-C_3N_4与氮掺杂石墨烯量子点(NGQDs)复合,制备了一种新型的非金属催化剂N-GQDs/g-C_3N_4。相比g-C_3N_4,N-GQDs/g-C_3N_4异质结在光催化产氢中表现出了更加优异的效果。最后从机理上解释了N-GQDs/CN-U异质结光催化产氢的原理及N-GQDs在光催化反应中所起的重要作用。
In this work,we reported a systematic study of the relationship between photocatalytic properties of hydrogen evolution and structures and morphologies of g-C_3N_4 prepared by different precursors( urea,melamine and dicyandiamide). The photocatalytic performances of H_2 production were affected by the method and degree of polymerization,the degree of protonation,and the morphology of g-C_3N_4 prepared by different precursors. Furthermore,a novel metal-free N-GQDs/g-C_3N_4 catalyst was designed and synthesized,which shown much better photocatalytic activity for H_2 evolution from water splitting than that of g-C_3N_4 due to the unique and multiple roles of N-GQDs. A mechanism was put forth to explain the roles of N-GQDs and the detailed enhancement of photocatalytic performance of the N-GQDs/g-C_3N_4.
出处
《南昌航空大学学报（自然科学版）》
CAS
2017年第1期28-35,共8页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
江西省研究生创新专项基金(YC2015-S312)
关键词
氮化碳
石墨烯量子点
产氢
非金属
光催化
carbon nitride
graphene quantum dots
hydrogen evolution
metal-free
photocatalysis
