采用半封闭一步热解方法,以三聚氰胺为前驱物制备g-C₃N₄,然后以圆筒状硅藻土(DE)为载体,合成DE/g-C₃N₄复合材料。并选取天然鳞片石墨为基本原料,运用Hummers法合成了氧化石墨烯(GO),在一定量的DE/g-C₃N₄粉末中加入不同质量分数的GO,得到DE/g-C₃N₄/GO三元复合光催化材料。通过SEM、BET、EDS、XRD、FT-IR对样品的晶体结构、形貌等进行表征,研究复合材料对罗丹明B溶液的光催化降解性能。结果表明,当GO的烯掺量为5%时,DE/g-C₃N₄/GO在可见光下,120min时,对RhB的降解率为93.74%,分别比DE/g-C₃N₄和g-C₃N₄提高了15.05%和31.03%。

In this paper,a semi-closed one-step pyrolysis method was used to prepare g-C₃N₄ with melamine as the precursor,and then cylindrical diatomaceous earth (DE) was used as a carrier to synthesize diatomaceous earth/g-C₃N₄ composite materials.After that,with natural flake graphite as the basic raw material,graphene oxide (GO)was synthesized by Hummers method.Finally,different mass fractions of GO were added to a certain amount of diatomaceous earth/g-C₃N₄ powder to obtain DE/g-C₃N₄/GO ternary composite photocatalytic material.The crystal structure and morphology of the samples were characterized by SEM,BET,EDS,XRD and IR,and the photocatalytic degradation performance of the composite material on rhodamine B solution was studied.The results showed that when the content of GO was 5%,the degradation rate of DE/g-C₃N₄/GO to Rhodamine B was 93.74% under visible light at 120 minutes,which was 15.05% and 31.03% higher than that of DE/g-C₃N₄ and g-C₃N₄,respectively.