Supported Granular Activated Carbon Catalyzed Oxidative Degradation Of Tetracycline Hydrochloride By Sodium Persulfate

All the tetracyclines in the environment are harm to animals,plants,microorganisms and so on.It was hard to remove them on the ordinary process of water treatment in water plants.If it existed in drinking water,it could lead to some drug-fast performances on humans,then affect clinical treatment,and even cause allergy symptoms.Therefore,the research on how to remove that kind of antibiotics effectively is always needed.This paper combined with transition metal activation persulfate advanced oxidation processes and the characteristics of loaded activated carbon,Based on the experimental.The loaded activated carbon materials by using filtration method,and measured its shapes and sizes,surface morphology,chemical composition by scanning electron microscope(SEM),X-ray powder diffraction(XRD).Then started the experiment which the three main materials activated sodium persulfate degraded tetracycline hydrochloride.The article analyzed the experiments dynamic model and other various single factors influence on the experiment.The results are as follows:SEM results showed that there were some small and shape particles on the surface of Fe-GAC and Fe/Ni-GAC and Fe/Co-GAC;XRD results showed that there were metal ions and their compounds loaded on the surface.The above said that GAC has increased the number and specific surface area and active site,but reduced the amount of precipitation of metal iron and the secondary pollution.Compared the effect of materials activated PS and degraded TC with it adsorption alone,the former greatly shorten the reaction time and almost completely removed TC.The Fe-GAC and Fe/Ni-GAC and Fe/Co-GAC experimental process fitted to first order kinetic model.Among them Fe/Co-GAC had the shortest reaction time,the fastest reaction rate,the largest TC degradation rate.Other factors which affected on the three degradation systems had the same rule.Three kinds of system degraded TC reaction rate and TC degradation rate with TC initial concentration were negatively related with TC initial concentration.The reaction rate and degradation rate increased with the increased concentration of PS(the best ratio TC: PS=1:10)and temperature.The mineralization rate was positive correlation with temperature.Fe/Co-GAC under the influence on the three factors had obvious advantages.Fe-GAC,Fe/Ni-GAC and Fe/Co-GAC activated PS degraded TC best pH at 5,7,or 5 respectively.Clcould be restrained reaction.After adding TBA and ETOH quenching agent in the threesystem,it showed that SO4-· play a vital role on oxidation in the system and there were loaded HO· on the materials surface.Several times added PS increase TC degradation rate also showed the same role of SO4-·.At the same situation always Fe/Co-GAC>Fe-GAC>Fe/Ni-GAC.The mineralization rate rule always Fe/Co-GAC>Fe/Ni-GAC>Fe-GAC.So,Fe/Co-GAC is the one of the best,the TC removed rate to 92.42%.