Study On The Influence Of PH And DO In Photocatalytic Fuel Cell Degrading Ofloxacin

Antibiotic pollution,in the environment of water,is getting more and more attention,and photocatalytic fuel cell with degradation of pollutants but also energy recovery is seen as an efficient,energy-saving water treatment technology.Ofloxacin?OFX?,which is high detection rate and severe pollution in water environment,was selected as targeted contaminant,by photocatalytic fuel cell?UVA-LED/TiO₂ NTs PFC?to study the influence of pH and dissolved oxygen?DO?concentration in the process.Single-chamber UVA-LED/TiO₂ NTs PFC obeyed pseudo first-order reaction kinetics for the degradation of ofloxacin.The degradation rate under different pH conditions was pH 7>pH 3>pH11;The experiments of free radical scavengers show that the superoxide radical has a certain role in different pH conditions,the contribution of hydroxyl radicals at pH 3 is greater than pH 7 and 11 and the contribution of holes at pH 7 is greater than pH 3 and11;The degradation efficiency of ofloxacin in a single-chamber UVA-LED/TiO2 NTs PFC slightly decreased in the absence of DO compared to DO sufficient conditions,the photocatalytic degradation of ofloxacin by double-chamber UVA-LED/TiO₂ NTs photocatalytic fuel cell in different dissolved oxygen concentrations show that photoelectron can directly react with ofloxacin molecules.The degradation pathways of ofloxacin were established by LC/MS analysis of intermediate products with different pH and DO concentrations.It was found that hydroxylation,demethylation,piperazine oxidation,decarboxylation and defluorination occurred under different experimental conditions.Defluorination reaction,however,has been inhibited at pH 3 and 7 conditions,and defluorination reaction have occurred in other experimental conditions.