| Berberine is a widely used antibacterial drug with strong anti-oxidative degradation properties,which can interfere with bacterial growth and reproduction,and is also an organic substance in pharmaceutical wastewater.Studies have shown that berberine has a stable structure,poor biodegradability of wastewater and strong microbial toxicity,making it difficult to apply general water treatment methods.Therefore,it is necessary to find an efficient removal method.This study designed a highly efficient TiO2 PECO(Photoelectrocatalytic Oxidation,PECO)and E-Fenton(Electrolytic-Fenton)synergistic catalytic oxidation system to treat berberine.Under the irradiation of electricity and ultraviolet light,the system simultaneously reacted with TiO2 PECO and E-Fenton,and the synergistic effect of the two improved the oxidative degradation efficiency of berberine.In this study,a porous gas diffusion electrode was prepared by impregnation method with nanometer manganese dioxide and graphite powder in a certain proportion and characterized by SEM and CV.The electron transport properties and electrical conductivity of the electrodes were investigated by linear scanning and four-probe methods.The ability of the electrode to produce H2O2 at different current intensities and electrolyte concentrations was investigated.It is mandatory to match the electrode of different materials,and finally the performance of the electrode with the ratio of 5:1 is proved to be the best.An E-Fenton system was constructed by using a gas diffusion electrode as a cathode and Fe as an anode.The effects of various influencing factors on the removal of berberine were investigated and studied.The TiO2 PECO system was constructed by using TiO2/Ti photoelectric anode and graphite felt as cathode.The effects of different factors on the removal of berberine in TiO2 PECO process were investigated.On this basis,the TiO2 PECO and E-Fenton synergistic reaction system was designed and developed to catalyze the oxidation of berberine.The oxidized substances of this system degrading berberine are all formed by the system itself.After the power is turned on,Fe2+is precipitated from the Fe anode,and O2 is reduced to H2O2 on the surface of the cathode.At the same time,TiO2 PECO and E with strong oxidative degradation properties are formed in the system.-Fenton reaction.The results show that the coupling effect inside the synergistic reaction system improves the removal effect of berberine.In the synergistic catalytic oxidation system of TiO2 PECO and E-Fenton,the effects of various influencing factors on the removal of berberine in the synergistic reaction system were studied,and the different operating parameters were optimized.Under the optimal reaction conditions,berberine was applied.The removal rate is up to 95%and the COD removal rate is 85%.Through comparative experiments,it was explored that UV/TiO2,UV/E-Fenton and UV/TiO2/E-Fenton systems have significant synergistic effects when they exist simultaneously.The catalytic performance of the electrode is stable,repeated 10 times,and the removal rate of berberine remains above 93%.Through the test,the experimental data of feasible operation was obtained,which provided theoretical basis and technical support for the practical application of electrochemical advanced oxidation technology to treat berberine. |
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