Preparation And Properties Of Light-Assisted Fenton Catalytic Films

Dye wastewater is known to have strong color,high organic content,complex and volatile and non-biodegradable matter,it has great harm to the environment.Seeking a cost-effective method to treat dye wastewater has been a problem of the water pollution treatment.Advanced oxidation processes(AOPs)have received increasing attention due to their fast reaction rates and strong oxidation capability,low cost compared with the non-photolytic AOPs.As a classical AOPs,heterogeneous Fenton technology provides a good way to degrade organic pollutants in water.In this paper,glass fiber was used as the carrier to study the preparation and performance of high-efficiency Fenton Catalytic film,The purpose is to solve the problem of iron sludge formed by traditional Fenton technology and broaden the pH range of Fenton reaction.Glass fiber supported Fe₂O₃ film with porous Turing structure was facilely fabricated by dip-coating sol-gel method.The continuous Fe₂O₃ film was assembly of highly dispersive uniform nanoparticles.The dominant exposed surface of the nanoparticles is(001)crystal plane.The porous structure not only a large number of catalytic active sites,but also supplied mass diffusion channels.Turing structure accelerated the mass exchange on the nanoparticles to speed up the catalytic reactions.These features rendered catalyst enhanced catalytic performances for photo-Fenton reaction.Under simulated sunlight conditions,33 mg L^-1 active red solution was completely degraded within 120 minutes with 0.02 g catalyst and 10 mmol L^-1H₂O_2.Catalyst also exhibited wide pH compatibility.The degradation efficiencies was 69.33%at pH 8 over 120 min,respectively.After five cycles of reaction,the decolorization rate remained at 100%,indicated that the catalyst had good reusability.Mechanism studies revealed that the catalyst promoted the decomposition of H₂O₂ to generate strong oxidizing·OH and·O₂^-and oxidized the dye molecules.Glass fiber supported Fe₃O₄ nanoparticle film was solvothermally fabricated as heterogeneous photo-Fenton catalyst,with ferric chloride as the precursor,glass fiber as the carrier,and ethylene glycol as the solvent.Tiny nanoparticles of cubic phase Fe₃O₄ in the film homogeneously coated on glass fiber to form nanoparticulate film with rough surface.Under simulated sunlight conditions,40 mg L^-1 active red solution was completely degraded within 50 minutes with 0.16 g L^-1 catalyst and 3 mmol L^-1H₂O_2.In comparison,only 35.3%of the dye was degraded under the co-existence of catalyst and H₂O₂.The pH compatibility was also greatly extended.Even at pH=8.5,a degradation efficiency of 69.6%was achieved.After six cycles of degradation,the reactive red solution can still be decolorized 100%,indicated that the catalytic film had long-term performance Catalytic.Mechanism studies revealed that the catalyst promoted the decomposition of H₂O₂ to generate strong oxidizing·OH and oxidized the dye molecules.