Adsorption/Degradation Of Ofloxacin Antibiotics In Water Environment By Magnetic Nano Material

Antibiotic is a kind of drug for bacteria infection diseases, even microscale of antibiotic in water can lead to the enhancement of resistance of bacteria towards antibiotics. Therefore it is of great importance to ensure that the drug is degradated before discharge.According to the catalytic property as the catalyst of homogeneous Fenton reaction and magnetic characteristics, Fe3O4 nanoparticles and its modificated composite are widely studied. In this paper, Fe3O4 magnetic nanoparticles and composite particles were synthesized by chemical synthesis method and its catalytic oxidation degradation of ofloxacin and adsorption effect were studied.First of all, Fe3O4 magnetic nanoparticles were prepared by co-precipitation without modification, and it’s combined with of several kind of carboxylic acid as the catalyst of heterogeneous Fenton reaction system, and this system was applied for degradation of ofloxacin antibiotic. The effect of carboxylic acid type, concentration, temperature, p H value on the degradation efficiency of the system were investigated. And the mechanism of catalytic oxidation degradation was also discussed. The results show that, the catalytic activity increased with the acidity, the concentration of carboxylic acid, temperature increased. The reaction mechanism is that complex is formed by carboxyl group and surface iron ion, promoting the circle of Fe2+ and Fe3+, producing more hydroxyl radical for oxidation degradation of ofloxacin.Besides,Ce O2/Fe3O4 nanocomposite catalyst was also prepared in this study, effects of Ce compound quantity, reaction temperature, p H value and other factors on the degradation efficiency of the system were investigated, and the mechanism how Ce element improving the catalytic activity of Fe3O4 was studied. The results show that the catalytic activity of Ce O2/Fe3O4, increase with Ce composite volume, temperature and acidity. Ce O2 strengthen the catalytic ability through the Fenton like reaction and the electronic transfer of oxygen vacancies during the catalytic reaction.Finally, to study the effect of different composite system on ofloxacin wastewater treatment, Fe3O4-montmorillonite(Fe3O4/MMT) composite particle was prepared. The composite particle was applied as the adsorbent to remove the ofloxacin in water. Effect of montmorillonite content, temperature, p H value and other factors on the adsorption were studied. And the adsorption mechanism was also discussed in this study. The results show that, the saturated adsorption amount increased with the content of MMT in Fe3O4/MMT composite particles, the increase of temperature. The optimal adsorption value of p H was 4. The adsorption process of adsorption accords with the pseudo second kinetics model.