石墨氮化碳
材料科学
X射线光电子能谱
罗丹明B
光降解
剥脱关节
光催化
傅里叶变换红外光谱
可见光谱
化学工程
结晶度
析氧
光化学
纳米技术
电化学
石墨烯
光电子学
化学
催化作用
工程类
复合材料
生物化学
电极
物理化学
作者
Shifei Kang,Lu Zhang,Chaochuang Yin,Yaguang Li,Lifeng Cui,Yangang Wang
标识
DOI:10.1016/j.apcatb.2017.04.050
摘要
Few-layer graphitic carbon nitride (g-C3N4) nanosheets with holey porous structures were prepared by fast treatment bulk g-C3N4 using environmental-friendly flash frozen exfoliation method within several seconds. The products were characterized by X-ray diffractometry, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy and electrochemical impedance spectroscopy. The foam-like holey ultrathin g-C3N4 nanosheets exhibit high crystallinity, narrower band gap (2.46 eV), more exposed edges and enhanced electron transport ability. N2 adsorption- desorption tests show that the few-layer g-C3N4 has a slightly-enlarged specific surface area of 135.6 m2/g and enriched small mesopores. Compared with bulk g-C3N4, the few-layer holey g-C3N4 showed a significantly enhanced ability of reactive oxygen species generation and 4-fold higher activity for visible-light-driven Rhodamine B photodegradation, which were mainly attributed to the enriched active sites and shorter pathway from the carrier to the reaction sites. These findings provide an inspiration for clean scale-up production of highly-active few-layer g-C3N4 pholocatalysts towards environmental and biological applications.
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