Degradation of Orange IV Solution by a Fenton-Like Process Using ${\mathsf{Fe}}^{\mathsf{3}\mathrm{+}}\mathrm{/}\mathsf{PVDF}\text{-}\mathsf{PMMA}$ Catalytic Membrane

A new kind of ${\mathrm{Fe}}^{3+}/\mathrm{polyvinylidene}$ fluoride membrane (PVDF)-polymethyl methacrylate (PMMA) asymmetric catalytic membrane was prepared by the phase inversion method and used as a heterogeneous Fenton-like catalyst to degrade Orange IV in the presence of ${\mathrm{H}}_2{\mathrm{O}}_2$. The effect of pH, initial concentration of ${\mathrm{H}}_2{\mathrm{O}}_2$ and Orange IV, reaction temperature and catalyst dosage, and the stability of catalyst on the degradation of Orange IV were investigated. The results show that the ${\mathrm{Fe}}^{3+}/\mathrm{PVDF}\text{-}\mathrm{PMMA}$ catalytic membrane can effectively decolorize Orange IV in the pH range of 3.1–5.2. The ${\mathrm{Fe}}^{3+}/\mathrm{PVDF}\text{-}\mathrm{PMMA}$ catalytic membrane’s retention rate decreased with the increase of concentration of Orange IV. The reaction rate constant is proportional to the initial concentrations of Orange IV. The ${\mathrm{Fe}}^{3+}/\mathrm{PVDF}\text{-}\mathrm{PMMA}$ catalytic membrane exhibits low iron leaching and good structural stability after five recycle times. The integrated process of membrane separation and heterogeneous Fenton-like catalytic oxidation was confirmed to be an effective process for degradation of Orange IV in wastewater.