The aim of the present work was the preparation of photoactive composites of g-C3N4/MMT type. In this work, g-C3N4/MMT photocatalysts were prepared by thermal polycondensation of the mechanical mixture of melamine and MMT at different temperatures (450, 550, 600, 620, 650, and 700°C). Using wide range of analytical methods (X-ray diffraction, infrared spectroscopy, diffuse reflectance spectroscopy, and photoluminescence) a significant differences in crystalline structure, morphology, and optical properties between the prepared composites were found. Furthermore, composites prepared at 550-650 °C were tested for the photocatalytic decomposition of N2O. Photocatalytic experiments showed very similar activity of all samples synthesized at 550-650°C. The best photoactivity was exhibited by the sample prepared at the highest temperature (620°C and 650°C). The N2O conversion in presence of sample prepared at 620°C and 650°C was 45 % after 20 hours of UVA irradiation.Keywords: melamine, g–C3N4, montmorillonite, composites, photocatalytic activity
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