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

doi:10.7503/cjcu20190598

Abstract

Abstract:

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.

Key words: Electro-Fenton, Catalytic degradation, Oily sewage, Wastewater treatment, Heterogeneous

CLC Number:

O647

TrendMD:

LIU Yigang,ZHAO Peng,HAN Yugui,SONG Xin,HAN Zhipeng,XIE Liangbo,LI Zhuang,JIA Xiaoqing,LI Yi. W Element Doped CeO₂ as Heterogeneous Electro-Fenton Catalyst for Efficient Treatment of Oily Wastewater ^†[J]. Chem. J. Chinese Universities, 2020, 41(3): 498.

Figures/Tables 6

Fig.1 SEM image of W-CeO2-0.4(A), TEM images of W-CeO2-0.4(B, C) and XRD patterns of CeO2 with different W doping ratios(D)

Fig.2 XPS survey spectra of W-CeO2-0.4(A) and XPS spectra of Ce3d(B), W4f(C), O1s(D) of W-CeO2-0.4

Fig.3 Comparison of different treatment methods(A), different catalysts(B), different voltage(C) and effect of different pH(D) on treatment of oily wastewater The optimal experimental conditions: c(Na2SO4)=50 mmol/L, pH = 3, voltage=4 V, catalyst dose=10 mg. In addition to the factors discussed, each group of experiments was conducted under the optimal conditions.

Fig.4 Changes in water quality of oily wastewater during physical adsorption(A), electro-adsorption(B) and heterogeneous EF(C)

Fig.5 Viscosity(A), storage modulus changes(B) in the degradation process, comparison of TOC remo-val rate(C) and COD removal rate(D) in degradation process under different treatment methods

Fig.6 Comparison of residual TOC(A) and COD(B) in degradation process under different treatment methods

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

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