| LI Xiao-le.Influence of the Ionic Liquid on the Performance of Lead Dioxide Electrode[J],49(10):176-181 |
| Influence of the Ionic Liquid on the Performance of Lead Dioxide Electrode |
| Received:October 12, 2019 Revised:October 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.10.019 |
| KeyWord:lead dioxide electrode ionic liquid catalytic activity electro-catalysis accelerated life p-nitrophenol |
| Author | Institution |
| LI Xiao-le |
Department of Metallurgical and Chemical Engineering, Jiyuan Vocational and Technical College, Jiyuan , China |
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| Abstract: |
| The work aims to improve the service life of lead dioxide electrode, and its electrocatalytic activity and selectivity for the phenolic wastewater. [BMIM]PF6 and [Emim]BF4 ionic liquid was added into Pb(NO3)2 solution and PbO2 electrode with SnO2 and Sb2O3 interlayer was prepared via electro-deposition. The influence of ionization product of different ionic liquids on the electrode performance was investigated by scanning electron miscroscopy (SEM), X-ray diffraction (XRD), accelerated life test, anodic linear polarization curves, cyclic voltammetry and electro-oxidative degradation experiment. The performance of F- modified PbO2 electrode was used for comparison. The PbO2 electrode modified by ionic liquid had high crystal grain crystallinity, changed crystal plane orientation, uniform crystalline size, smooth and compact surface with many edges and corners, and increased effective surface area and active points. [BMIM]PF6 modified PbO2 electrode was better than [Emim]BF4 modified PbO2 electrode. The accelerated life and stability period of [BMIM]PF6 modified PbO2 and F- modified PbO2 were 168.8 and 162.6 h and 101.2 and 69.8 h, respectively. The oxygen evolution potential was 1.71 V and 1.59 V, respectively. Cyclic voltammograms showed the potential of oxidation peak of [BMIM]PF6 modified PbO2 was smaller and its current of oxidation peak was larger than F- modified PbO2. Under identical conditions, the removal ratio of p-nitrophenol using [BMIM]PF6 modified PbO2 electrode and F- modified PbO2 was 95.7% and 87.1%, respectively and the removal percentage of organic carbon was 85.2% and 61.5%, and the cell voltage was 3.26 and 3.47 V, respectively. The crystallinity, homogeneity and compactness of PbO2 electrode modified by ionic liquid [BMIM]PF6 and [Emim]BF4 are enhanced, and the active points of electrode are increased, and due to the different ionized ion sizes of the two ionic liquids, the spatial resistance of the electrodeposited grains is different, which make the former better than the latter, and the difference of crystal morphology and microstructure makes the catalytic activity of PbO2 modified by [BMIM]PF6 for phenolic wastewater electrooxidation, selectivity and longevity significantly increase. |
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