Evaluation of bifunctional applications of CuFe₂O₄ nanoparticles synthesized by a sonochemical method

Morphological, electrochemical, and dye photodegradation studies on CuFe2O4 nanoparticles (NPs) prepared by a probe sonication method are presented. Powder X-ray diffraction (PXRD) analysis indicated an average crystal size of 35-40 nm for the synthesized NPs. Diffuse-reflectance spectroscopy (DRS) and measurement of the band-gap energy indicated semiconductor behaviour. Vibrating sample magnetometry (VSM) studies at 300 K clearly revealed that CuFe2O4 NPs exhibit weak ferromagnetic behaviour. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) have been applied to analyze the electrochemical properties of the NPs. A CuFe2O4 NP electrode showed a greater response in an acidic medium (0.1 M HCl) than in a basic medium (0.1 NaOH). Specific capacitance values of 1.54 and 0.02 F g(-1) were calculated from cyclic voltammograms at the CuFe(2)O(4 )electrode vs. an Ag/AgCl electrode in 0.1 M HCl and 0.1 M NaOH, respectively, at a scan rate of 10 mV/s. The electrode also showed high sensitivity for paracetamol, good cycling stability, and high rate capability. From EIS data, the CuFe2O4 NPs showed pseudocapacitive characteristics. CuFe2O4 NPs have been employed as a photocatalyst for the removal of Methylene blue (MB) and Drimarene yellow (DY) dyes, whereby pH proved to be crucial. Under UV light, the degree of photocatalytic degradation was found to be high for MB (94%) but low for DY (29%).