Study On Photocatalytic-fenton Synergistic Treatment Of Organic Pollutants With Two-Dimensional Nanostructures

The rapid development of industry has brought economic benefits,but produced a large amount of organic wastewater,which has the characteristics of stable structure,complex composition,high toxicity and difficult degradation.These severely restrict the human living environment and damage the health of animals.It is urgent to develop new and efficient processes to realize advanced treatment.Photocatalytic oxidation and Fenton reaction,as one of the effective technologies for wastewater treatment,have the characteristics of strong oxidation ability,and have huge application prospects in the deep degradation.The Fe-doped two-dimensional layered BiOCl oxygen vacancy（OVs）photocatalyst was prepared by one-step solvothermal method.XRD,XPS and ESR analysis showed the samples information.The oxygen vacancies in the BiOCl improve the effective utilization of light,extend the absorption band edge by 20 nm,promote the separation efficiency of photogenerated carriers,double the photocurrent intensity,and reduce the resistance of electron transfer.Conducive to the activation of H₂O₂ to produce more·OH.By introducing light and H₂O₂ to construct a photocatalytic-Fenton synergistic degradation system,with phenol as the pollutant,the performance and mechanism of photocatalytic-Fenton synergistic degradation of pollutants were studied.After 12 minutes of ultraviolet light irradiation,the degradation of 40 ppm phenol is as high as 100%,and the degradation efficiency is still as high as 80%after 4 cycles,and it has good stable performance.Bi₂₄O₃₁Cl₁₀/Fe₂O₃ composite heterojunction photocatalyst with visible light response was synthesized by hydrothermal method and calcination method.The matching energy level structure greatly promoted the separation efficiency of photogenerated electrons and holes,which was beneficial to the change of high and low valence states of Fe ions and realized the synergy between photocatalysis and Fenton reaction.Experiments show that the degradation rate of organic matter by photocatalysis-Fenton is obviously improved,which is 3.5 times and 10.2 times higher than that Fenton and photocatalysis,respectively.When Fe₂O₃ loading is 10%and H₂O₂ adding amount is 19.5 m M,the synergistic degradation efficiency of phenol after visible light irradiation for 75 min is 95%.Figure 42;Table 2;Reference 98...