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CoS2–CuS nanocomposites were synthesized through a simple ultrasound-assisted sol–gel technology facilely. The preparation of CoS2–CuS on cellulose fiber was carried out successfully. The microstructure, surface morphology and the optical properties of the as-synthesized catalyst samples had been considered with the XRD, SEM, UV–Vis spectra and photoluminescence. The chemical states of samples were...