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

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 charac...

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Bibliographic Details
Published in:	Beilstein journal of nanotechnology Vol. 15; no. 1; pp. 475 - 489
Main Authors:	Anh, Vo Chau Ngoc, Nhi, Le Thi Thanh, Dung, Le Thi Kim, Hoa, Dang Thi Ngoc, Son, Nguyen Truong, Uyen, Nguyen Thi Thao, Thu, Nguyen Ngoc Uyen, Son, Le Van Thanh, Hieu, Le Trung, Tuyen, Tran Ngoc, Quang Khieu, Dinh
Format:	Journal Article
Language:	English
Published:	Germany Beilstein-Institut 29-04-2024
Subjects:	cobalt ferrite Full Research Paper graphene quantum dots methylene blue Nanoscience Nanotechnology cobalt ferrite methylene blue graphene quantum dots
Online Access:	Get full text
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2190-4286 2190-4286
DOI:	10.3762/bjnano.15.43