Song Xiaojie, Ye Sisi, Zhou Xin, Gui Wanrui, Yang Can, Yang Zhihong
Faculty of Materials Science and Chemistry, Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences Wuhan 430074 China
RSC Adv. 2021 Jul 16;11(40):24822-24835. doi: 10.1039/d1ra03562b. eCollection 2021 Jul 13.
A novel composite consisting of NiO/NiC/g-CN with excellent photocatalytic properties was successfully synthesized by the simple calcination of layered double metal hydroxide (LDH) and melamine. The color and chemical composition of the as-prepared composites could be tailored by changing the mass ratio of NiAl-LDH and g-CN. For the L4C composite at the ratio of 1 : 1, it showed the desired dark color due to the generated NiC. It also showed high photodegradation efficiency under visible light irradiation, reaching 97.5% toward Rhodamine B and 92.6% toward tetracycline. The high photodegradation efficiency could be mainly attributed to the unique formation of NiC cocatalysts coupled with g-CN and NiO semiconductors, which constructed a Z-scheme system and facilitated the efficient separation of the photogenerated electron-hole pairs. The present findings provide a promising approach for fabricating the new types of composite photocatalysts for pollutant degradation.
通过对层状双金属氢氧化物（LDH）和三聚氰胺进行简单煅烧，成功合成了一种具有优异光催化性能的新型复合材料NiO/NiC/g-CN。通过改变NiAl-LDH与g-CN的质量比，可以调整所制备复合材料的颜色和化学成分。对于比例为1:1的L4C复合材料，由于生成了NiC，呈现出所需的深色。在可见光照射下，它还表现出高光降解效率，对罗丹明B的光降解率达到97.5%，对四环素的光降解率达到92.6%。高光降解效率主要归因于NiC助催化剂与g-CN和NiO半导体独特的形成，构建了一个Z型体系，促进了光生电子-空穴对的有效分离。本研究结果为制备用于污染物降解的新型复合光催化剂提供了一种有前景的方法。
