Fe-C填料作电芬顿阴极体系降解苯酚机理研究OA

Phenol-containing wastewater is difficult to degrade,easily accumulates,and poses serious risks to humans and ecosystems.The Fe-C fillers were used as the cathode in an electro-Fenton system to degrade phenol in wastewater in this study.The electro-Fenton process promotes the reduction of iron at the Fe-C cathode surface,thereby enhancing the generation conditions for active substances in micro-electrolysis and significantly improving phenol degradation efficiency.The Fe-C filler cathode can transfer electrons to O2 to generate H2 O2 in situ.Concurrently,the direct current promotes the micro-electrolysis reaction,enhancing the corrosion of Fe0 within the Fe-C fillers.Furthermore,O2 acquires electrons at the carbon cathode of the fillers,generating H2 O2 via the·O-2 pathway.Additionally,the Fe-C cathode reduces Fe3+,sustaining a stable concentration of Fe2+in the system.The active substances quenching experiments confirmed that·OH is the dominant active substances responsible for phenol degradation in this system.Characterization of the Fe-C filler before and after reaction revealed that the Fe-C filler cathode effectively reduces surface iron oxides,mitigating passivation layer formation.In the electro-Fenton system utilizing Fe-C filler as the cathode,the phenol and COD removal rates reached 77.26%and 69.25%,respectively.This represents a significant enhancement compared to both stand-alone Fe-C micro-electrolysis and electro-Fenton systems.Additionally,the Fe-C filler cathode exhibits advantages of low energy consumption and excellent cycling stability.