Activation Of Persulfate With MIL-53（Fe）/Bi₂MoO₆ Photocatalyst For Degradation Of Organic Pollutants

With the rapid development of urbanization and industrialization,dyes,hormones and other endocrine-damaging compounds,pharmaceuticals and personal care products,pesticides and other pollutants have been successively detected in surface water and groundwater.Among them,due to the complex structure and poor biodegradability of dye acid orange 7（AO7）wastewater,conventional water treatment methods are difficult to effectively degrade and endanger human health and the ecological environment.Therefore,it is of great significance to explore an economical,efficient and environmentally friendly water treatment method.In this paper,a composite photocatalyst of MIL-53（Fe）metal organic framework compound bismuth molybdate（Bi₂Mo O₆,BM）was prepared by solvothermal method,and the catalyst was subjected to XRD,SEM,FT-IR,XPS,UV-vis DRS,Characterize PL,understand its crystal form,surface morphology,type of functional group,optical properties and other characteristics.Explore the effect of reaction conditions,inorganic anions and other factors on the degradation of AO7 in the system,and use free radical quenching experiments and electron paramagnetic resonance technology to explore the activation mechanism and deduce the possible degradation pathways of pollutants.the main contents were as follows:（1）BM was synthesized by hydrothermal method,then MIL-53（Fe）/BM composite catalyst was synthesized by solvothermal method,which were characterized by XRD,SEM,FT-IR,XPS,BET,UV-Vis DRS and PL technologies.It was found that BM,MIL-53（Fe）,and MIL-53（Fe）/BM catalysts were successfully synthesized.（2）The initial concentration of AO7 is 10 mg/L,the concentration of PMS is 1 mmol/L,the dosage of 0.1 MIL-53（Fe）/BM is 0.2 g/L,the initial p H is 7.6,and after 60 min of reaction,light/The 0.1MIL-53（Fe）/BM/PMS system can degrade AO7 up to 99%.The capture experiment and EPR detection showed that ¹O₂,h⁺,SO₄^-·,·OH all contribute to the degradation of AO7,of which ¹O₂ is the main active species.The degradation products were detected and the possible degradation pathways of AO7 were proposed.In the light/0.1MIL-53（Fe）/BM/PMS system,Cl^-and CO₃^2-can promote the degradation of AO7 in the system,NO₃^-has no obvious effect,but HA has an inhibitory effect.In addition,the degradation performance of the light/0.1MIL-53（Fe）/BM/PMS system on different pollutants was also studied.The light/0.1 MIL-53（Fe）/BM/PMS system shows the potential to degrade organic pollutants in environmental remediation.（3）After optimizing the reaction conditions for degradation of AO7by the light/0.1 MIL-53（Fe）/BM/PDS system,the light/0.1MIL-53（Fe）/BM/PDS system will degrade AO7 after 60 minutes Up to98%.The capture experiment and EPR detection showed that h⁺,¹O₂,SO₄^-·,·OH all contribute to the degradation of AO7,and h⁺is the main active species.Through the detection of degradation products,the possible degradation pathways of AO7 were proposed.Common Cl^-,CO₃^2-,NO₃^-and HA in water all have inhibitory effects on the degradation of AO7 in the system.Through the degradation of different pollutants,it is found that light/0.1 MIL-53（Fe）/BM activated PDS can degrade a variety of organic pollutants,and it is a method suitable for treating most organic pollutants.