Treatment Of Organic Wastewater By Electro-Fenton System Based On Carbon Nano-catalyst

In this paper,high efficient heterogeneous cathode materials were prepared and electro Fenton system was used to degrade rhodamine B and ciprofloxacin hydrochloride.The p H range of electro-Fenton method was expanded,and the degradation rate of pollutants and the stability of cathode materials were improved,which provided theoretical support for the application of electro-Fenton system in the degradation of pollutants.The main research results are as follows.Acidified carbon nanotube catalyst with enhanced adsorption capacity was prepared by strong acid acidification method.The results showed that the optimal conditions for rhodamine B degradation were acidification for 30 min,p H=3,Fe²⁺dosage of 6 mmol·L^-1and stable voltage of-0.6 v.the degradation efficiencies respectively at 52.2%,85.5%,93.7%and 94.0%were obtained in 5 min,10 min,20min and 60 min.The electro Fenton system reached the maximum degradation efficiency in 15 min,and the higher degradation efficiency was obtained in a shorter time,which was beneficial to improve the reduction of residence time in practical application.Fe OCl/CNTs cathode materials were prepared by calcination impregnation method,and the degradation of ciprofloxacin hydrochloride wastewater by electro-Fenton system was studied（150°C、200°C、250°C、300°C）The electrochemical properties of the cathode materials and the degradation efficiency of ciprofloxacin hydrochloride were investigated under the following conditions:p H,Nafion dosage,Fe OCl/CNTs Catalyst Loading.The results showed that the optimum calcination temperature for ciprofloxacin hydrochloride degradation was 250℃.Under the conditions of p H 3,loading 7.5 mg Fe OCl/CNTs,Nafion addition 0.75 m L and voltage-0.6 V,the degradation efficiency of 81.0%was obtained in 60 min.In the study of the stability of cathode materials,the results show that:after five times of stability test of strong acid acidified carbon nanotubes and Fe OCl/CNTs cathode materials,the degradation effect of pollutants has no obvious change,indicating that the two cathode materials have good stability,and the electrochemical characterization of the two catalysts shows that they have good oxidation-reduction performance.It provides a certain theoretical support and basis for the application of Electro-Fenton process in wastewater,which is of great significance.