光催化
异质结
光降解
材料科学
石墨烯
化学工程
扫描电子显微镜
热液循环
透射电子显微镜
光致发光
纳米技术
可见光谱
催化作用
光电子学
复合材料
化学
有机化学
工程类
作者
Yanhui Ao,Liya Xu,Peifang Wang,Chao Wang,Jun Hou,Jin Qian,Yang Li
标识
DOI:10.1016/j.apsusc.2015.07.027
摘要
In this paper, graphene (GR) and titania co-modified flower-like Bi2O2CO3 multi-heterojunction composite photocatalysts were prepared by a simple and feasible two step hydrothermal process. The prepared samples were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectrometry (DRS), photoluminescence (PL), N2 adsorption–desorption isotherm, and photo-induced current. The photocatalytic activity was investigated by the degradation of MO under UV light irradiation. The as prepared multi-heterojunction GR/Bi2O2CO3/TiO2 composites exhibited much higher photocatalytic activity than pure Bi2O2CO3, TiO2 and GR–Bi2O2CO3. The higher performance of GR/Bi2O2CO3/TiO2 can be ascribed to the formation of multi-heterojunctions, which promote the effective separation of photo-induced electron–hole pairs. Moreover, the higher photocatalytic activity can also be ascribed to the high surface area of GR and TiO2, which offers more active sites for the photodegradation reaction. Furthermore, the photocatalytic activity of GR/Bi2O2CO3/TiO2 remained without striking decrease after five cycles, which indicates the excellent stability of GR/Bi2O2CO3/TiO2 composites. This work would pave a way to the design of high efficient multi-heterojunction photocatalysts.
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