Photocatalytic degradation of methylene blue under visible light by cobalt ferrite nanoparticles/graphene quantum dots.

Autor:	Anh VCN; University of Pharmacy and Medicine, Hue University, Vietnam.; University of Sciences, Hue University, Vietnam., Nhi LTT; Center for Advanced Chemistry, Institute of Research & Development, Duy Tan University, Vietnam.; Faculty of Natural Sciences, Duy Tan University, Vietnam., Dung LTK; University of Pharmacy and Medicine, Hue University, Vietnam., Hoa DTN; University of Pharmacy and Medicine, Hue University, Vietnam., Son NT; University of Pharmacy and Medicine, Hue University, Vietnam., Uyen NTT; University of Sciences, Hue University, Vietnam., Thu NNU; University of Sciences, Hue University, Vietnam., Son LVT; University of Education and Science, The University of Danang, Vietnam., Hieu LT; University of Sciences, Hue University, Vietnam., Tuyen TN; University of Sciences, Hue University, Vietnam., Quang Khieu D; University of Sciences, Hue University, Vietnam.
Jazyk:	angličtina
Zdroj:	Beilstein journal of nanotechnology [Beilstein J Nanotechnol] 2024 Apr 29; Vol. 15, pp. 475-489. Date of Electronic Publication: 2024 Apr 29 (Print Publication: 2024).
DOI:	10.3762/bjnano.15.43
Abstrakt:	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 °C in a 24 h thermal hydrolysis process. The obtained materials were characterised by using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible diffuse reflectance spectroscopy, Fourier-transform infrared spectroscopy, photoluminescence spectroscopy, vibrating-sample magnetometry, and nitrogen adsorption/desorption isotherms. Cobalt ferrite crystals of around 8-10 nm and graphene quantum dots formed directly at 200 °C. 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%. The CF/GQDs are considered as an efficient photocatalyst for MB degradation and other dyes. Competing Interests: The authors have no relevant financial or non-financial interests to disclose. (Copyright © 2024, Anh et al.)
Databáze:	MEDLINE
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