aufe3o4构建的非均相fenton体系处理难降解有机物的分析word格式论文.docxVIP

AbstractThe Fenton system belonging to AOPs is catching more attention and being widely applied by virtue of many advantages as high reaction rate,completely oxidation and easy accessibility.However,traditional Fenton system is facing barriers in practical application dealing with organic pollutant,such as production of iron sludge which is in huge amount and difficult to remove, extravagant consumption of oxidant and waste of catalyst.Therefore,a new type of Fenton system inheriting the advantages of traditional Fenton technology and avoiding the defaults mentioned above is in urgent need.Hence in this research a new kind of gold loaded ferroferric oxide catalyst in nanoscale was prepared and applied in heterogen eous Fenton system deteriorating organic contaminat in order to study its tre atment effect,reaction discipline and its reaction mechanism.In this research gold loaded ferroferric oxide catalyst Au-Fe3O4 was synthetized co-precipitatedly.Results of XRD,BET and VSM tests gave information on phase composition,average surface area and mean pore size,declaring a sound ferromagnetic property which make catalyst recycle easily achieved by an applied magnetic field. Catalysts with different ratios of gold were tested respectively for their catalytic activity and Au(1.0wt%)/Fe3O4 was selected as the most effective catalyst.To inspect the catalytic activity for deterioration of non -biodegradable organic pollutants,this catalyst was implemented in heterogeneous Fenton system. P- Nitrophenol(PNP), was chosen to be the target substrate.A series of tests was proceeded,results of which indicated that the existence of gold could significantly enhance the heterogeneous Fenton process concerning about more than 90% PNP degradation in 30min and better than 65% TOC removal in 90min. After that the effects of several reaction conditions on catalytic efficiency were studied by corresponding experiments one after another.Experimental results demonstrated that lower pH benefits