Adsorption And Degradation Of Norfloxacin By UiO-66-NH₂ And Its Composites

In this paper,two kinds of Zr-MOFs?UiO-66-NH₂ and UiO-66?were synthesized by a simple hydrothermal synthesis method and the adsorption properties of two materials to NOR were studied.Then,the Co₃O₄/UiO-66-NH₂ was synthesized by water bath heating and calcining methods.Meanwhile,the degradation of NOR by peroxymonosulfate was studied,which provided a new research idea for the method of deep removal of antibiotics in water.This thesis mainly includes the following two aspects:1.Since the inventions of antibiotics,humans have used more and more antibiotics,and a large number of antibiotics have been released into the natural ecosystem.Howerver,the traditional adsorbent has poor antibiotic removal effect,low adsorption capacity and is difficult to regenerate.Therefore,we used metal organic matrix as the adsorbent of antibiotics and we successfully synthesized highly stable Zr-based MOFs?UiO-66-NH₂ and UiO-66?and studied the adsorption behaviors of norfloxacin?NOR?in water.The results characterized by SEM,TEM,XRD and TG showed UiO-66-NH₂ had good chemical stability before and after adsorption.The adsorption capacities in UiO-66-NH₂ approached as high as 222.5 mg/g for NOR,which were much higher than those of many other reported adsorbents.Moreover,the equilibrium time?6 hours?was less than many adsorbents which have been reported in the previous literature.The ionic strength influence experiments showed that the NaCl and CaCl₂ aqueous solutions could improve the NOR removal efficiency.The presence of humic acid could hardly affect the adsorption amounts.In addition,UiO-66-NH₂ had good regeneration efficiency,which possessed certain application prospects to remove norfloxacin from sewage.Ultimately,a variety of credible adsorption mechanisms were also proposed.The obtained results will aid us to comprehend the surface interaction between organic micropollutants and UiO-66-NH₂ and prefigure the promising potentials of UiO-66-NH₂ as a novel adsorbent for the efficient removal of NOR from aqueous solution.2.In this paper,Co₃O₄ nanoparticles were prepared and successfully compounded with UiO-66-NH₂,and the morphology and structure of the material were disscussion.We found that Co₃O₄ nanoparticles can be evenly distributed on octahedron UiO-66-NH₂.The experimental results show that Co₃O₄/UiO-66-NH₂ composite has better degradation efficiency than Co₃O₄ nanoparticles,and the leaching concentration of cobalt ions is smaller,indicating that the composite material has better stability than Co₃O₄ alone.The experimental results show that under the conditions of 1.0mm PMS and 0.2g/L catalyst at neutral pH,about 90%of NOR can be degraded within 30 min.In addition,the mechanism of PMS activation by Co₃O₄/UiO-66-NH₂ composites was studied through the free radical identification by quenching experiments and EPR technology.In addition,the Co₃O₄/UiO-66-NH₂ composite material has good regeneration efficiency,which has a certain application prospect for the removal of NOR from drinking water,and this work will also provide a potential contribution to the removal of NOR from the environment.