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Nanotechnol."],"accepted":{"date-parts":[[2024,3,26]]},"abstract":"<jats:p>A simple approach was developed to synthesize cobalt ferrite nanoparticles\/graphene quantum dots (CF\/GQDs). The material was prepared from a homogeneous mixture of iron nitrate, cobalt nitrate, and starch at 140, 180 and 200 \u00b0C in a 24 h thermal hydrolysis process. The obtained materials were characterised by using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet\u2013visible diffuse reflectance spectroscopy, Fourier-transform infrared spectroscopy, photoluminescence spectroscopy, vibrating-sample magnetometry, and nitrogen adsorption\/desorption isotherms. Cobalt ferrite crystals of around 8\u201310 nm and graphene quantum dots formed directly at 200 \u00b0C. Stacking GQDs sheets onto the CF nanoparticles resulted in CF\/GQDs nanoparticles. The nanocomposite exhibits satisfactory fluorescent and superparamagnetic properties, which are vital for catalytic applications. The CF\/GQDs catalyse significantly the degradation of methylene blue (MB) under visible light. The catalyst can be recycled with an external magnetic field and displays suitable stability. Also, it was reused in three successive experiments with a loss of efficiency of about 5%. 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