Degradation Of Ofloxacin By TiO₂ Supported By Hydrotalcite

Ofloxacin is a kind of antibiotic drug that is difficult to degrade.It exists in the water environment and is harmful to the ecosystem and human beings.Therefore,the study on the degradation of ofloxacin is of great importance.The pHotocatalytic degradation of ofloxacin into carbon dioxide and water was carried out by using loose adsorbent hydrotalcite with good pHotocatalytic performance and no secondary pollutants introduced.In addition,with the gradual improvement of drainage standards in China,the pollution caused by antibiotics has gradually attracted attention.This method can be used in the pretreatment,deep treatment and other practical engineering stages,but it is still in the research stage.This experiment provides technical support for the practical application.This experiment to study different kinds of water talc do carrier of ofloxacin degradation and the effect of using scanning electron microscopy（SEM）technology on the microstructure and morpHology of different kinds hydrotalcite were characterized,and respectively under the condition of the ultraviolet and visible light carrier negative effect on the degradation of ofloxacin,best choose the degradation effect of negative carrier:Zn-Al hydrotalcite.In addition,the effects of several variable factors in the process of the degradation of ofloxacin by TiO₂ supported by Zn-Al hydrotalcite were studied,including initial concentration,dosage and pH of ofloxacin,and possible interfering substances in actual water bodies,such as anions,cations and others,to provide references for actual water treatment projects.1.The degradation effect of various kinds of hydrotalcite as carriers on ofloxacin was Zn-Al>Zn-Fe>Mg-Fe>Mg-Al.The Zn-Al hydrotalcite was used as the carrier.2.The degradation rate of ofloxacin by zn-al hydrotalcite load hydrotalcite gradually slowed down,in line with the quasi-primary kinetic equation:y=-0.01732x-0.9407,the kinetic rate constant was 0.01732,and the half-life was 14.3minutes.The degradation rate was 99.1%.3.The lower the initial concentration,the shorter the degradation time;With the gradual increase of dosage,the degradation rate first increased and then decreased.The optimal dosage concentration was 10g/L,which was greater than 0.2g/L of titanium dioxide.Different acid and base conditions have different degradation efficiency:neutral>alkaline>acidic,the higher the pH value under acidic conditions,the better the degradation effect,the lower the pH value under alkaline conditions,the better the degradation effect.4.K⁺promoted the degradation of ofloxacin,and Al³⁺,Ca²⁺,and Mg²⁺inhibited the degradation of ofloxacin.The degradation intensity:Al³⁺>Ca²⁺=Mg²⁺>Na⁺.Cl^-had no effect on the degradation of ofloxacin,while C₂O₄^2-,CO₃^2-and HCO₃^- inhibited the degradation of ofloxacin.K⁺and I^-promoted the degradation of ofloxacin.