Ag₃PO₄ Photocatalyst Composite Modification And Degradation Of Methyl Orange

Semiconductor photocatalysis technology is one of the advanced treatment methods of dye wastewater.Ag₃PO₄is a new photocatalyst with good performance,which can respond to visible light,but Ag₃PO₄has poor stability and is difficult to separate and recover from water.Aiming at the problem of poor stability of Ag₃PO₄,the photocatalyst Ag₃PO₄/GO with higher photocatalytic performance was prepared by composite go;Aiming at the problem that it is difficult to recover the photocatalyst,the photocatalyst Ag₃PO₄/GO/NiFe₂O₄was prepared by compounding NiFe₂O₄.The catalyst has strong magnetism and is easy to recover.This thesis takes methyl orange as the target pollutant,and the specific research contents are as follows:The photocatalyst Ag₃PO₄/GO was prepared and its properties were investigated.The results of XRD,SEM and UV Vis showed that the crystallinity of Ag₃PO₄/GO nanoparticles was good and had strong visible light response ability;The results of methyl orange degradation test showed that the photocatalytic activity of Ag₃PO₄/GO was significantly better than that of Ag₃PO₄,and the optimal loading of go was 1.0%;The results of cyclic degradation test show that Ag₃PO₄/GO has strong stability.The results show that the performance of Ag₃PO₄/GO composite photocatalyst is significantly better than that of single Ag₃PO₄photocatalyst.The effect of reaction conditions on the degradation of methyl orange by photocatalyst Ag₃PO₄/GO was investigated and the mechanism was studied.The results of single factor test showed that the reaction conditions of high dosage,acidic p H,high temperature and low pollutant concentration of photocatalyst were conducive to the photocatalytic degradation of methyl orange by Ag₃PO₄/GO.The results of active substance capture test show that the contribution of active substances in the reaction is h⁺>·O₂^->·OH,and it is inferred that the mechanism of photocatalytic degradation of methyl orange by Ag₃PO₄/GO is that go improves the photocatalytic performance of Ag₃PO₄by rapidly transferring photogenerated electrons.The photocatalyst Ag₃PO₄/GO/NiFe₂O₄was prepared and its properties were investigated.The results of XRD,SEM and UV Vis showed that the crystallinity of Ag₃PO₄/GO/NiFe₂O₄nanoparticles was good and had strong visible light response ability;The results of methyl orange degradation test showed that Ag₃PO₄/GO/NiFe₂O₄had better photocatalytic activity;The results of cyclic degradation test show that Ag₃PO₄/GO/NiFe₂O₄has strong stability,magnetic separation performance and convenient recovery.The results show that the photocatalytic performance of Ag₃PO₄/GO/NiFe₂O₄composite photocatalyst is better than that of Ag₃PO₄and Ag₃PO₄/GO.The effect of reaction conditions on the degradation of methyl orange by photocatalyst Ag₃PO₄/GO/NiFe₂O₄was investigated and the mechanism was studied.The results of single factor test showed that the reaction conditions of high dosage,acidic p H,high temperature and low pollutant concentration of photocatalyst were conducive to the photocatalytic degradation of methyl orange by Ag₃PO₄/GO/NiFe₂O₄.The results of active substance capture test show that the contribution of active substances in the reaction is h⁺>·O₂^->·OH,and it is inferred that the mechanism of photocatalytic degradation of methyl orange by Ag₃PO₄/GO/NiFe₂O₄is that a Z-type heterojunction is formed between NiFe₂O₄and Ag₃PO₄to improve the photocatalytic performance of Ag₃PO₄.Photocatalysts Ag₃PO₄/GO and Ag₃PO₄/GO/NiFe₂O₄have good degradation effect on methyl orange and have high application value in the removal of trace pollutants.The combination of go and NiFe₂O₄can enhance the stability and light absorption of Ag₃PO₄.At the same time,Ag₃PO₄/GO/NiFe₂O₄has high magnetic separation performance,which is more conducive to recovery and reuse.