Study On The Photocatalysis-Fenton-Like Coupling For Advanced Treatment Of Organic Pollutants

Organic pollutants are difficult to degrade under natural conditions,directly or indirectly endangering human health.As a kind of advanced oxidation technology,photocatalysis has a strong oxidation ability,but faces the problem of easy recombination of photogenerated electrons（e^-）and holes（h⁺）.Fenton oxidation utilizes the hydroxyl radicals（·OH）generated by the redox process to degrade organic pollutants,but the catalytic efficiency is limited by the single active site and the slow reduction process.Photocatalysis combined with Fenton oxidation can synergistically generate more active species,thereby improving the degradation efficiency of organic pollutants.At present,the key to improving the photocatalytic-Fenton synergistic system is to develop efficient catalysts.Cu/CuFe₂O₄-OVs catalysts with Cu⁰ and surface oxygen vacancies（OVs）were prepared by in situ reduction of CuFe₂O₄-OVs by ascorbic acid（Vc）,and the photocatalysis-Fenton-like coupled catalysis was successfully constructed by adding H₂O₂.Cu⁰ can not only accelerate the Fenton-like reaction,but also accelerate the improvement of the photocatalytic efficiency,and also act as a transfer channel for the two-electron center to accelerate the generation of·OH.Oxygen vacancies not only induce Cu/CuFe₂O₄-OVs to form two-electron centers,but also act as activated H₂O₂ reaction sites,and the system can promote the degradation activity.The experimental results show that it has a good stability and can degrade 92.72%of 100 ppm phenol in 18 min.The degradation efficiency constant was 8165times that of pure photocatalysis and 4.35 times that of Fenton oxidation.Based on the two-electron center of CuFe₂O₄-OVs and the selective degradation of different pollutants,Cu₂（OH）₃Cl was compounded with CuFe₂O₄-OVs.The CuFe₂O₄-OVs/Cu₂（OH）₃Cl photocatalytic-Fenton-like synergistic degradation system was formed by adding H₂O₂ to degrade the mixed pollutants of phenol and methylene blue（MB）.Theσ-Cu-ligand complex formed by Cu（Ⅱ）and phenol is easily attacked by H₂O₂,resulting in electron transfer from phenol to Cu（Ⅱ）to produce active site Cu（Ⅰ）.The experimental results show that the composite catalyst has a degradation efficiency of 100%for phenol and 93.00%for MB in 90 min.Figure 45;Table 2;Reference 98...