Abstract
Abstract NixCo1-x Fe2O4 (x=0.5%) catalyst was prepared by sol-gel method and Ag-CoFe2O4 (0.5%) catalyst was prepared by photo-reduction method. These catalysts were characterized by various analytical techniques. UV-Visible spectra of NixCo1-x Fe2O4 and Ag-CoFe2O4 samples show wide absorption in the visible region. PL spectra of NixCo1-x Fe2O4 show higher emission than the Ag-CoFe2O4 sample. This indicates that Ag-CoFe2O4 catalyst possesses lower recombination rate. Cyclic voltametry (CV) of Ag-CoFe2O4 electrode observed enhanced oxidation and reduction peak. Langmuir adsorption isotherm model was calculated by using Langmuir equation and in which the Ag-CoFe2O4 sample shows higher adsorption than NixCo1-x Fe2O4. Langmuir adsorption model best fits the Ag-CoFe2O4 sample towards fast red (FR) dye degradation. This indicates Ag-CoFe2O4 sample generates more number of adsorption sites than NixCo1-x Fe2O4. Ag-CoFe2O4 catalyst exhibits higher photocatalytic activity than the NixCo1-x Fe2O4 catalyst could be due to the well known phenomena of surface plasmon resonance (SPR) which allows more electrons to be available on the surface of Ag-CoFe2O4 catalyst, and these electrons react with atmospheric oxygen to generate additional number of super-oxides radical
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