Optimisation of multifunctional CuCoFe2O4 for degradation of acid orange 7

Abstract

Textile industry-derived synthetic dyes, such as acid orange 7 (AO7), pose a significant challenge to wastewater treatment due to their resistance to conventional biological degradation methods. In this research, copper-doped cobalt ferrite (CuCoFe2O4, CCF) was synthesised using co-precipitation and hydrothermal methods to evaluate its potential to function as a catalyst for peroxymonosulfate (PMS)-based AO7 degradation. Various hydrothermal conditions and stoichiometric ratios of Fe:Cu were explored to identify optimal parameters, with 130℃ for 20 hours and a 5:1 ratio yielding the highest degradation efficiency. Characterisation via Field Emission Scanning Electron Microscope and Energy Dispersive X-ray confirmed the formation of CCF.

Degradation tests revealed that light exposure enhances the reaction rate by approximately 33%. Coagulant functionality tests demonstrated CCF’s ability to reduce turbidity upon addition, hinting at its potential as a coagulant. Reusability tests showed a significant performance decline upon reuse.

The results suggest that Cu doping improves catalytic performance, thereby warranting exploration for the degradation of other pollutants. Furthermore, the multifunctionality of CCF suggests broader utility beyond its role as a PMS catalyst.