MnFe2O4 decorated reduced graphene oxide heterostructures: Nanophotocatalyst for methylene blue dye degradation

By B. Mandal, J. Panda, P. Paul, R. Sarkar, B. Tudu. 2020

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Abstract The photocatalytic degradation of methylene blue dye (MB) has been investigated using bare manganese ferrite (MnFe2O4) nanoparticles and MnFe2O4 nanoparticles-decorated reduced graphene oxide heterostructures (MnFe2O4/rGO) under ultra-violet irradiation. The MnFe2O4 nanoparticles prepared using a facile co-precipitation method showed single-phase cubic spinel structure and superparamagnetic property. The MnFe2O4/rGO heterostructures showed the formation of sphere-like MnFe2O4 nanoparticles well-attached on rGO nanosheets with reduced agglomeration. The photocatalysis study shows that MnFe2O4/rGO had higher photocatalytic activity compared to bare MnFe2O4 nanoparticles. MB degraded by 84% in presence of MnFe2O4 after UV irradiation of 290 min, while 97% of it degraded in merely 60 min in case of MnFe2O4/rGO heterostructures. This is further confirmed by the well-fitted Langmuir-Hinshelwood Kinetics equation. This improvement in the photocatalytic activity of the heterostructure is attributed mainly to the retardation of the recombination process of photo-generated charge carriers. Hydroxyl radicals play the crucial role in the MnFe2O4-graphene system for MB photodegradation. Thus, MnFe2O4 nanoparticles-decorated reduced graphene oxide heterostructures can act as potential photocatalyst for degradation of hazardous organic dyes present in water.

Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/5ea8c491b2a5ae2f28d517b114fdab7994143107