Besides, the developed ZnO@N-doped C is considered a promising photocatalyst to degrade the dye residual after adsorption. Both FLU and MeB dyes were UV photodegraded in the presence of ZnO@N-doped C. Using ZnO@N-doped C (200 mg/L), the concentration of MeB (50 mg/L) decreased to < 0.1% after adsorption and degradation. The concentration of FLU decreased to < 7% after adsorption and degradation. Reducing the catalyst load resulted in a relative decrease in the degradation capacity. The reactivity of ZnO@N-doped C towards MeB adsorption insignificantly decreased alongside four cycles but strongly decreased towards FLU adsorption.