Study on influencing factors and mechanism of degradation of ibuprofen by particle activated carbon three-dimensional electrode ozone system
To solve the problems of low mass transfer efficiency and difficult degradation of organic matter in traditional electrocatalytic ozone(E-O3)process,particle electrode of granular activated carbon(GAC)was introduced into the E-O3 process,and three-dimensional E-O3 system(E-O3-GAC)was established.Ibuprofen(IBP)was selected as the target pollutant to compare the oxidative degradation efficiency of the system.The results show that the oxidation capacity of E-O3-GAC system is significantly better than that of conventional catalytic systems(electrolysis(E),activated carbon adsorption(GAC),ozone oxidation(O3),activated carbon catalysis(O3-GAC),electrocatalytic ozone(E-O3)),and the degradation rate of IBP can reach 96.9%within 40 min reac-tion time.At the same time,the synergistic index(SI)of E-O3-GAC system is 2.97,indicating that the electric field and GAC have good synergistic activation.The optimal operating parameters of E-O3-GAC system are as fol-lows:GAC concentration is 0.5 g/L,current intensity is 300 mA,ozone flow rate is 60 mL/min,and the initial solution is acidic.A series of quenching and characterization experiments showed that in the E-O3-GAC system,GAC and electric field synergistically catalysed O3,significantly increasing the yield of hydroxyl radical(·OH).GAC,as a particle electrode,could effectively reduce O2 to H2O2 in aqueous solution and react with O3 to generate·OH.The applied electric field offered a protective effect for the GAC,thus maintaining the stability of GAC catalytic activity.To sum up,the E-O3-GAC system is efficient and stable.In summary,E-O3-GAC system is an efficient and stable organic wastewater treatment technology,which is expected to play an advantage in the field of organic wastewater treatment.
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