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Z‐scheme 3 D g‐C 3 N 4 /TiO 2−x Heterojunctions with High Photocatalytic Efficiency
Author(s) -
Li Zhenxing,
Ge Kai,
Yang Kai,
Wang Shuang,
Li Xuehan,
He Jiahui,
Fu Congcong,
Ye Jin,
Zhang Yue,
Yang Yongfang
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202003150
Subject(s) - x ray photoelectron spectroscopy , heterojunction , photocatalysis , materials science , nanorod , scanning electron microscope , field emission microscopy , analytical chemistry (journal) , transmission electron microscopy , nanotechnology , chemical engineering , chemistry , diffraction , catalysis , optics , optoelectronics , physics , biochemistry , chromatography , engineering , composite material
The 3D network structure composed of g‐C 3 N 4 nanorods was prepared via treatment of bulk g‐C 3 N 4 with hot HNO 3 followed by adjustment the pH and lyophilization. Then the 3D g‐C 3 N 4 /TiO 2−x heterojunctions with a strong interface was constructed via loading TiO 2−x nanoparticles onto the 3D g‐C 3 N 4 networks under hydrothermal conditions. The structure and morphology of the 3D g‐C 3 N 4 /TiO 2−x heterojunctions was characterized by infrared spectrum (FTIR), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and field emission transmission electron microscope (TEM). The photo‐degradation rate of Doxycycline HCl for 3D g‐C 3 N 4 /TiO 2−x heterojunction is about 4 times of that original bulk‐C 3 N 4 and 2.75 times of 3D g‐C 3 N 4 . The improved photocatalytic efficiency is attributed to 3D g‐C 3 N 4 networks, which provides the more transfer channel to accelerate the electron transportation and the strong heterointerface between g‐C 3 N 4 and TiO 2−x which promotes the separation of the electron‐holes. Besides, more adsorption capacity of the pollutant onto the 3D g‐C 3 N 4 /TiO 2−x also contributed to this high efficiency.