摘要
光催化技术可直接利用太阳光实现有机污染物的深度降解,传统光催化剂二氧化钛存在可见光转换效率低,光生电子-空穴对容易复合等缺点。采用简单的化学法制备了二维纳米片层石墨相氮化碳(g-C_3N_4)包覆二氧化钛纳米粒子复合光催化剂(g-C_3N_4/TiO_2),利用XRD、UV-Vis、SEM、PL等手段对光催化剂的结构性能进行了表征,并考察了复合材料在紫外、可见光下降解亚甲基蓝(MB)、苯酚及双酚A的性能。研究结果表明:二维纳米片层g-C_3N_4的引入可以实现复合材料对可见光的吸收利用,并且可以极大地提高光生电子空穴在界面处的分离效率。在紫外光照射20 min后,5%g-C_3N_4/TiO_2复合物对染料亚甲基蓝(MB)的降解率高达90%,并且在重复使用5次之后仍具有较高的光催化性能。
The photocatalytic technology can directly utilize the sunlight to realize the deep degradation of organic pollutants.The conventional photocatalyst TiO2 has the disadvantages of low visible light conversion efficiency and easy recombination of photogenerated electron-hole pairs.In this paper,a two-dimensional nano-sheet g-C3N4 coated TiO2 nanoparticle composite photocatalyst(designated g-C3N4/TiO2)was prepared by simple chemical method.The structure and performance of the composite were characterized by XRD,UV-Vis,SEM,and PL.Meanwhile,the properties of the composites degrading methylene blue(MB),phenol and bisphenol A under ultraviolet and visible light irradiation were investigated.The results showed that the introduction of two-dimensional nano-sheet g-C3N4 not only could realize the absorption and utilization of visible light,but also greatly improve the separation efficiency of photogenerated electron holes at the interface.After the UV irradiation for 20 min,the degradation rate of dye MB by 5%g-C3N4/TiO2 composite was as high as 90%,and it still had high photocatalytic performance after repeated use for five times.
作者
安伟佳
徐子怡
邵化旭
刘磊
苗叶凡
An Weijia;Xu Ziyi;Shao Huaxu;Liu Lei;Miao Yefan(College of Chemical Engineering,North China University of Science and Technology,Tangshan 063009,China)
出处
《无机盐工业》
CAS
CSCD
北大核心
2019年第4期81-85,共5页
Inorganic Chemicals Industry
基金
河北省自然科学基金青年基金(B2018209356)
华北理工大学生创新创业训练计划项目(X2016039)
