Morphology and band structure regulation of graphitic carbon nitride microspheres by solvothermal temperature to boost photocatalytic activity
Tóm tắt
Graphitic carbon nitride (g-C3N4) microspheres (CNMS) were fabricated via a solvothermal method by using supramolecular complexes of dicyandiamide and cyanuric chloride as precursors. The effect of solvothermal temperature on the morphology, band structure, and activity was systematically investigated. Structural characterization results indicate that the samples prepared at 180 °C (CNMS-180) and 200 °C (CNMS-200) possess spherical morphology, while irregular bulk particles were obtained at 160 °C (CN-160). In addition, the band gap increased as the solvothermal temperature decreased from 200 to 160 °C. In comparison with CN-160 and CNMS-200, the valence band of CNMS-180 was more positive and thus gives higher photo-oxidation capability. Accordingly, CNMS-180 exhibits higher photocatalytic degradation efficiency on Rhodamine B, stronger photocurrent response, and lower charge transfer resistance. Additionally, CNMS-180 exhibits excellent stability after four runs. This work might provide a guidance for the regulation of morphology and band structure of g-C3N4-based materials prepared at low temperatures.
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