Effect of functional cathodes on carbamazepine removal in the photocatalytic fuel cell
Photocatalytic fuel cell(PFC)has the great potential for simultaneous refractory organic pollutants degradation and energy recovery.The cathode may affect the electricity production and anode photocatalytic performance of this system.In this study,TiO2/g-C3N4/CQDs film electrode(TCNC)was used as the photoanode of the PFC,and the effect of different functional cathodes on the removal of carbamazepine(CBZ)was investigated.Under the power intensity of 80 mW.cm-2(LED white light),300 min treatment by PFC with carbon-loaded platinum air diffusing cathode(Pt/C)resulted in higher CBZ removal efficiency of 75.2％than that with graphite cathode(PG),Fenton-like air diffusing cathode(GF)and ordinary platinum cathode(Pt).At the same time,TCNC-Pt/C system had higher energy recovery with the Pmax of 1.5 μW·cm-2,which was 3-5 times of the PFC systems with other three cathodes.Furthermore,the effects of initial CBZ concentration,electrolyte type,power intensity,humic acid and current intensity on the removal of CBZ by the TCNC-Pt/C system were investigated.Based on the EPR results,quenching experiments and intermediate product analysis,it was suggested that O2-and OH were the dominated reactive species leading to CBZ degradation in the TCNC-Pt/C system,and the probable degradation pathway of CBZ was identified.This study may provide a data reference for the low-consumption and high-effective removal of CBZ by the PFC system.
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维普
