Preparation And Photocatalytic Activity Of Cobalt Ferrite/Molybdenum Disulfide Composite Nanomaterials

Cobalt ferrite is a spinel ferrimagnetic compound with excellent electromagnetic and ferromagnetic properties.Molybdenum disulfide is a typical layered hexagonal metal sulfide which has attracted attention because of its high specific surface area and excellent light stability.In this thesis,the preparation and properties of cobalt ferrite and molybdenum disulfide composite nanomaterials were studied.The application of cobalt ferrite/molybdenum disulfide composite nanomaterials in the photocatalytic degradation of organic dyes was investigated.The photocatalytic mechanism has been deeply explored and studied.In detail,the specific research content is mainly divided into two parts:1.Photocatalytic properties of CoFe2O4 nanorod/flower-like MoS2 nanosheet nanosheet composite nanomaterials.A novel heterostructural composite consisting of CoFe2O4 nanorod loaded with flower-like MoS2 nanosheets was synthesized by electrospinning combined with a one-step hydrothermal method.The CoFe2O4/MoS2 heterostructures show excellent photocatalytic ability for the degradation of organic dyes under visible light irradiation.The degradation rate of the organic dye Congo Red(CR)reached 94.90%within 60 min,where the initial rate constant is about 12 times higher than that of pure MoS2.Further,good photocatalytic ability for the degradation of anion methyl orange(MO)and cation methylene blue(MB)is also presented.It is worth mentioning that the remarkable magnetic performance of CoFe2O4 in the heterostructures guarantees their easy separation and recycling,ensuring its environmental friendliness and reusability.It is indicated that as-prepared CoFe2O4/MoS2 is an excellent visible light driven photocatalyst.2.Photocatalytic performance of CoFe2O4/MoS2 heterostructures under magnetic field.The CoFe2O4/MoS2 nanomaterials were synthesized by electrospinning combined with hydrothermal method.The photocatalytic properties of the samples magnetized by different strength magnetic fields.The results show that the CoFe2O4/MoS2 nanomaterials exhibit the best photocatalytic degradation magnetized by 1500 Oe magnetic field.The degradation rate of the organic dye Congo Red(CR)is 96.70%,and the degradation rate constant is about 1.03 times higher than that without magnetic field.Also,compared to pure MoS2,the degradation rate constant of magnetized CoFe2O4/MoS2 improves greatly.It is shown that the magnetization of magnetic field can significantly improve the photocatalytic degradation of CoFe2O4/MoS2 nanomaterials.The magnetically enhanced photocatalytic ability of CoFe2O4/MoS2 nanomaterials indicates their potential and promising application in the treatment of industry wastewater.