Study On The Adsorption And Degradation Of Antibiotics By Modified MIL-101

Antibiotics abuse and inappropriate treatment caused the phenomenon that a certain amount of antibiotics can be detected in many rivers.It posed a threat to human health so that degrading antibiotics process need efficient and inexpensive environmental protection material.As a kind of efficient and inexpensive photo catalyst,Ti O₂ was widely used to study.Ti O₂ has a response for only UV light.There is about 5%UV light in solar light,which can activate TiO ₂ to generate a number of radicals.However,Ti O₂ is difficult to recycle.MOFs materials have high surface area and pore diameter to absorb antibiotics.MIL-101?Fe?/Ti O₂ composite can degrade antibiotics during absorption process.To recycle the catalyst,the MIL-101?Fe?/Ti O₂ composite was calcined to have magnetism.In this paper,MIL-101?Fe?and MIL-101?Fe?/Ti O₂ composite were prepared using hydrothermal method.Magnetic materials were prepared during calcination process.XRD,EDS and FT-IR indicated MIL-101?Fe?and MIL-101?Fe?/Ti O₂ were synthesized successfully.SEM,TEM and BET,however,shown pore volume and surface area of magnetic materials became smaller.The surface of the materials became rough and surface area became smaller after incoming Ti O₂.The TC degradation efficiency,using Fe-based MOFs catalysts to activate persulfate,suggested materials with Ti O₂ introduced have higher degradation efficiency.The degradation efficiency of using MIL-101?Fe?/Ti O₂ composite was better than mixture of MIL-101?Fe?and Ti O₂.The optimal molar ratio of MIL-101?Fe?/Ti O₂was Fe Cl₃·6H₂O:TiO₂=1:1.The better degradation efficiency of TC need lower concentration of TC or stronger intensity of light.XPS indicated Fe state of MIL-101?Fe?/Ti O₂ was Fe³⁺and Ti³⁺was existed.Ti O₂ can react with Fe³⁺to generate Fe²⁺and radicals.Fe²⁺can activate persulfate to form radical to degrade TC,which process is quite fast.The degradation efficiency of TC can reach 90.15%in 5 min,using 1 g L^-11 catalyst and persulfate to degrade 20mg L^-11 TC.The electron-hole of calcined MOFs materials can separate easily to generate more radicals so that it can reach better degradation efficiency.The higher degradation efficiency need lower TC concentration or more catalyst dose.VSM showed magnetic MIL-101?Fe?/Ti O₂ have superparamagnetic property so that it can be separated from TC solution easily.Magnetic MIL-101?Fe?/Ti O₂ can be desorbed by the way of water-ethanol-ultrasound.After 5^thh run,the degradation efficiency was similar with initial one.The material remained good crystalline and stability.The structure was not been damaged.