Synthesis of Erbium Doped g-C3N4 Catalyst and Its Photocatalytic Degradation Activity under Red Light

Abstract

Abstract: Graphite carbon nitride (g-C₃N₄) has become the hot research material in the field of photocatalysis. In this study, Er-doped g-C₃N₄ was synthesized by methanol-refluxing method using melamine as precursor. The resulting composite photocatalysts were characterized by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), ultraviolet-visible-near infrared reflection spectrophotometer (UV-Vis-NIR Spectrophotometer), infrared spectrum (IR), photoluminescence spectroscopy (PL), N₂-physisorption and confocal laser scanning microscopy (CLMS). Results indicate that the rare-earth metal Er is highly disperse on g-C₃N₄ and it is favor for the introduction of nitrogen vacancies. The addition of Er optimize the energy band structure of g-C₃N₄, enhance the absorption of visible light, improve the electron-hole separation rate, furthermore, it is also found that Er/g-C₃N₄ photocatalyst process strong upconversion ability. The photocatalytic degradation of rhodamine B solution is performed under 660 nm LED red-light irradiation, and the rate constant of the Er/g-C₃N₄ is 2.0 times as high as that of pure g-C₃N₄. It is also found that the superoxide radical is the main active species for catalytic reaction in this system.

Key words: g-C₃N₄, Er doped, methanol-refluxing method, photocatalysis, red light, upconversion, degradation activity

CLC Number:

XU Qili, SHEN Chaofeng, HE Changchun, SHI Wei, ZHANG Hui, YIN Yujie, TIAN Jing, ZHANG Ziyue, CHEN Na, WANG Peng. Synthesis of Erbium Doped g-C₃N₄ Catalyst and Its Photocatalytic Degradation Activity under Red Light[J]. Journal of Synthetic Crystals, 2020, 49(12): 2313-2321.

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Synthesis of Erbium Doped g-C₃N₄ Catalyst and Its Photocatalytic Degradation Activity under Red Light

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