关键词: 光催化, 　四氧化三钴, 　四环素, 　异质结, 　石墨氮化碳

Abstract: The use of solar photocatalytic degradation of pollutants is one of the most promising technologies to solve water
pollution problems and achieve solar energy conversion. By changing the amount of g⁃C₃N₄ added, g⁃C₃N₄4/Co3O4 catalysts with
different g⁃C₃N₄ mass fractions are prepared based on the calcination method with cobalt nitrate hexahydrate (Co（NO₃)₂•6H₂O) and
urea (NH₄CNO) as raw materials. The samples are analyzed and characterized using X⁃ray diffraction（XRD）, X⁃ray photoelectron
spectroscopy（XPS）and ultraviolet visible absorption spectroscopy（UV vis DRS）. To speculate on the active species of the
catalyst, capture agent experiments are conducted on it. The results indicate that the synergistic effect between g⁃C₃N₄ and Co₃O₄
can improve the transfer and separation efficiency of charge carriers at the interface between the two phases. Under visible light,
the degradation effect of 10% g⁃C₃N₄/Co₃O₄ is the best, with a degradation rate of 66.5%, which is higher than the degradation
effect of single Co₃O₄（degradation rate of 35.9%）. The active species of the catalyst are mainly superoxide radicals（•O₂^—）and
holes（h+）. After compounding with g⁃C₃N₄, the drawbacks of Co3O4 electron hole pair, such as too fast recombination and a
deficient energy level structure, are improved, providing ideas for the degradation of organic pollutants in the future.

Key words: Photocatalysis, Cobalt tetroxide, Tetracycline, Heterojunction, Graphite nitride carbon