Degradation Of Ciprofloxacin Hydrochloride By Electro-fenton System Based On Fh/CNTs Modified Graphite Felt Cathode

In this paper,ferrihydrite is prepared,mixed with carbon nanotubes,and then loaded on a graphite felt to make an electro-Fenton reaction cathode material.The efficient and green degradation method of floxacin provides some theoretical support for the electro-Fenton reaction in the field of degrading antibiotics.The main research results of this paper are as follows:（1）The Fh/CNTs catalyst was prepared and supported on graphite felt,and the degradation rate of the electro-Fenton system loaded with different kinds of catalysts was compared.The effects of degradation rate of the electro-Fenton system,from high to low,are ordered as follows:Fh/CNTs>CNTs>Fh.（2）The effects of six influencing factors of catalyst Fh:CNTs,initial p H of reaction,catalyst loading,electrolyte concentration,initial voltage and Nafion addition on the degradation rate of ciprofloxacin hydrochloride after 90 minutes were studied by single-factor control experiments..The 90-minute hydrochloric acid cycle was determined when Fh:CNTs=3:2,initial reaction p H=3,catalyst loading was 100mg,electrolyte Na₂SO₄concentration was 0.03 M,initial voltage was-1.0 V,and Nafion dosage was 1.0 m L.The degradation rate of profloxacin was the highest,reaching 86%.（3）In order to study the reusability of the cathode material,six repeated degradation experiments were carried out on the Fh/CNTs supported graphite felt,under the condition of p H=3,the graphite felt loaded with 100mg Fh:CNTs=3:2degraded 20mg/L ciprofloxacin hydrochloride for 6 repeated experiments,each degradation was 90 minutes,after 6 times degradation experiments,the degradation rate of the cathode material only decreased by 9.8%,and the reusability is strong.（4）The adsorption performance of the prepared cathode material under non-energized conditions was experimentally studied.The results showed that the removal rate of ciprofloxacin hydrochloride under the adsorption effect was only 17%in 90 minutes,indicating that the cathode material was under the electro-Fenton system.The adsorption of ciprofloxacin only plays a minor auxiliary role in the removal of pollutants,and mainly relies on the Fenton reaction to generate·OH to degrade ciprofloxacin hydrochloride.（5）The response surface analysis of the six factors affecting the degradation rate of ciprofloxacin hydrochloride investigated in the experiment was carried out.First,three significant influencing factors were screened out by using the Plackett-Burman experimental design,which were Fh:CNTs,initial p H and p H of the reaction.The amount of Nafion added.Then,using Box-Behnken response surface analysis,the response regression model of the degradation rate is obtained as follows（Y represents the degradation rate,A is Fh:CNTs,B is the initial p H of the reaction,and C is the amount of Nafion added）:Y=80.67-1.66A+0.83B+2.71C+1.5AB-0.17AC+0.35BC-14.09A~2-4.18B~2-4.8C~2 And obtained the optimal reaction conditions of Fh/CNTs electro-Fenton degradation of ciprofloxacin hydrochloride:Fh:CNTs=1.472,initial reaction p H=3.101,Nafion addition amount=1.072m L,the predicted degradation rate reached the maximum,which was 81.148%.In order to verify the accuracy of the model prediction,the experiment was carried out by simulating the optimal control conditions in the laboratory,and the degradation rate of ciprofloxacin hydrochloride in 90 minutes was 82.17%.