Study On Degration Of Sulfonamide Antibiotic Wastewater By Fe/MOF Photocatalytic Coupling Persulate

In recent years,with the vigorous development of animal husbandry and pharmaceutical industry,the demand for antibiotics has greatly increased,and the discharged antibiotic wastewater has seriously polluted the water body.Antibiotics in water are difficult to be degraded by microorganisms and even lead to micro-antibiotic wastewater has become an important issue affecting the sustainable development of human healthy and economy in today’s society.A new technology coupling photocatalytic technology with advanced oxidation of activated persulfate was studied.The synthesis method of Fe-UiO-66 material was explored by two-step solvothermal method,and the effect of synthesis conditions on the properties of the material was investigated.The successful synthesis of Fe-UiO-66 was verified by XRD,FT-IR,SEM and TEM.Specific surface area and pore size（BET）,solid ultraviolet（UV-vis）,electrochemical impedance spectroscopy（EIS）,and Mott-Schottky curves were used to verify the photocatalytic performance of the synthesized materials.Fe-UiO-66 was used to catalyze the degradation of sulfonamide antibiotics.The catalytic degradation effects of sulfonamide antibiotics in different systems were investigated,and the effects of different conditions such as Fe-UiO-66 catalyst dosage,PS oxidant dosage,initial substrate concentration and p H on the degradation rate were investigated.The kinetics and degradation mechanism of sulfonamide antibiotics degradation by Fe-UiO-66/PS were analyzed,and the stability of the material was evaluated.The results that when the preparation time was 24h,the doping ratio of Fe was Fe:UiO=1:2,and the preparation temperature of the material was 24h,the degradation efficiency of sulfanilamide on methoxypyrimidine was the best.Combining photocatalytic technology with persulfate advanced oxidation technology,the degradation efficiency of Fe-UiO-66 was 89.9%within 300min under sunlight.Fe doping can effectively improve the catalytic activity and reaction efficiency of UiO-66.This good photocatalytic performance is mainly due to the introduction of Fe,which leads to the expansion of UiO-66 to the solar range.The photocatalytic degradation process of sulfanilamide to methoxypyrimidine by Fe-UiO-66/PS/Light conformed to the quasi-first-order kinetics,and the correlation coefficient could reach above 0.90.The quenching experiment confirmed that compared with·OH and h⁺,·SO₄^2-and·O₂^-radicals played a major role.The stability of Fe-UIO-66catalyst was analyzed.Through 5 repeated tests,it was found that the fifth removal rate of sulfanilamide by Fe-UiO-66/PS/Light catalyst was above 88%.The low concentration of Fe²⁺leaching after five repeated tests was verified by atomic absorption,and the excellent reliability and stability of Fe-UiO-66/PS/Light catalyst were proved.It is proved that Fe-MOF materialhas great potential in removing antibiotic pollutants in wastewater.