W Element Doped CeO2 as Heterogeneous Electro-Fenton Catalyst for Efficient Treatment of Oily Wastewater

W element-doped CeO2 was designed as heterogeneous Electro-Fenton ( EF) catalyst to purify oily wastewater, and the effect of efficient purification of oily wastewater was realized. In addition, W-CeO2-0. 4 composite was characterized by means of scanning electron microscopy , transmission electron microscopy , X-ray diffraction and X-ray photoelectron spectroscopy. The results showed that W element doped CeO2 with irregular flake morphology has better redox ability and Fenton-like catalytic effect compared with pure CeO2. As heterogeneous EF catalyst, the treatment effect of oily wastewater is better than that of electro-adsorption and physical adsorption obviously. In the further parameter optimization experiment, it was found that the purification capacity of oily wastewater reached 99. 8% , TOC removal rate reached about 90% , COD removal rate reached 76% in 90 min when the voltage was 4 V , pH =3 and W-CeO2-0. 4 was used as catalyst.