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A new composite by coupling chalcopyrite (CuFeS 2 ) with silver phosphate (Ag 3 PO 4 ) (CuFeS 2 /Ag 3 PO 4 ) was proposed by using a cyclic microwave heating method. The prepared composites were characterized by scanning and transmission electron microscopy and X-ray diffraction, Fourier-transform infrared, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. Under optimum conditions and 2.5 W irradiation (wavelength length &gt; 420 nm, power density = 0.38 Wcm -2 ), 96% of rhodamine B (RhB) was degraded by CuFeS 2 /Ag 3 PO 4 within a 1 min photo-Fenton reaction, better than the performance of Ag 3 PO 4 (25% degradation within 10 min), CuFeS 2 (87.7% degradation within 1 min), and mechanically mixed CuFeS 2 /Ag 3 PO 4 catalyst. RhB degradation mainly depended on the amount of hydroxyl radicals generated from the Fenton reaction. The degradation mechanism of CuFeS 2 /Ag 3 PO 4 from the photo-Fenton reaction was deduced using a free radical trapping experiment, the chemical reaction of coumarin, and photocurrent and luminescence response. The incorporation of CuFeS 2 in Ag 3 PO 4 enhanced the charge separation of Ag 3 PO 4 and reduced Ag 3 PO 4 photocorrosion as the photogenerated electrons on Ag 3 PO 4 were transferred to regenerate Cu 2+ /Fe 3+ ions produced from the Fenton reaction to Cu + /Fe 2+ ions, thus simultaneously maintaining the CuFeS 2 intact. This demonstrates the synergistic effect on material stability. However, hydroxyl radicals were produced by both the photogenerated holes of Ag 3 PO 4 and the Fenton reaction of CuFeS 2 as another synergistic effect in catalysis. Notably, the degradation performance and the reusability of CuFeS 2 /Ag 3 PO 4 were promoted. The practical applications of this new material were demonstrated from the effective performance of CuFeS 2 /Ag 3 PO 4 composites in degrading various dyestuffs (90-98.9% degradation within 10 min) and dyes in environmental water samples (tap water, river water, pond water, seawater, treated wastewater) through enhanced the Fenton reaction under sunlight irradiation.

Microwave-Assisted Synthesis of Chalcopyrite/Silver Phosphate Composites with Enhanced Degradation of Rhodamine B under Photo-Fenton Process