Textile wastewater (TWW) has become a significant source of surface water contamination as it contains various types of pollutants. In addition, dye waste is of major concern owing to their toxic and carcinogenic nature. Different technologies have been applied for the treatment of dyes, but they were unable to completely degrade the dye and end up releasing toxic by-products that lead to secondary pollution. Lately, potassium peroxymosulfate (PMS) is widely advocated as an oxidiser to be use in the degradation of dyes in advanced oxidation processes (AOPs) because of rapid of formation of sulphate radicals that are more reactive than hydroxyl radicals. have been one of the most spoken of subjects in the degradation of dyes; potassium peroxymonosulfate (PMS) is widely used as oxidizer in the AOPs used because of rapid formation of HO● radicals. However, PMS take longer to degrade the dye, thus the need to couple the process with nanoparticles to increase conversion rate. Cobalt oxide were found to be the most efficient activator for PMS. Since it has been found to be difficult to remove the cobalt oxide NPs from solution after degradation, immobilization of the NPs on a membrane support has been shown to be the most effective solution. Moreover, the addition of catalysts to the casting solution has an effect on the membrane performance in terms of permeability. Methylene blue (MB) dye was used as the model pollutant. The effect of different concentrations of cobalt oxide NPs immobilised on a polyethersulfone ultrafiltration membrane were studied. Higher MB degradation efficiencies of up to 96% over a period of 360min were achieved with the highest concentration of cobalt oxide NPs. Furthermore, a decrease in the flux of ± 40% was observed with an increase in nanoparticle size. It was then inferred that the nanocomposite membrane could be incorporated into the textile industry wastewater treatment process with the end goal of reuse and reduce freshwater usage.