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Enhanced mass transfer and service time of mesh Ti/Sb-SnO2 electrode for electro-catalytic oxidation of phenol

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Abstract

Titanium-based SnO2 with Sb dopant (Ti/Sb-SnO2) was of interest in the field of electro-catalytic oxidation due to its high organic oxidation rates. However, the relatively poor mass transfer performance and short service time limited its practical application. To overcome this problem, Ti/Sb-SnO2 electrode was fabricated on mesh substrate and used as the anode for electrochemical oxidization of phenol. Compared to the anode prepared on planar Ti, the mesh anode with compact and uniform catalyst surface lowered electron transfer resistance and higher Oads content (17.41%), which benefited the generation of hydroxyl radicals (·OH) (increment of 24.5%). In addition, this structure accelerated the fluid perturbation around electrode in microscopic scale as the COMSOL simulation result indicated; the electric potential on mesh anode varied regularly along the undulant terrain of electrode so that the mass transfer coefficient was enhanced by 1.67 times. These structure-dependent characteristics contributed to the superior electro-catalytic performance toward degradation of phenol. Experimental results showed that mesh anode had a higher TOC removal efficiency of 90.6% and mineralization current efficiency of 20.1% at current density of 10 mA cm−2, which was 9.95% and 21.6% higher than the planar anode, and the service lifetime was 1.89 times longer than planar anode. This highly electro-catalytically active and stable Ti/Sb-SnO2 mesh electrode showed a potential application prospect toward electro-catalytic degradation process.

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Acknowledgments

This research was supported by the National Key Research and Development Program (Grant No. 2017YFA0207204) and the International Cooperation Project between China and US (No. 21673061). The research also got the support from the Natural Science Foundation of China (No. 21972036) and from State Key Lab of Urban Water Resource & Environment (2018DX01). The authors also thank to the support from the Innovation Team in Key Areas, Ministry of Science and Technology of China.

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  1. Linlin Huang and Da Li contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China

    Linlin Huang, Junfeng Liu, Lisha Yang, Changchao Dai, Nanqi Ren & Yujie Feng

  2. School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China

    Da Li

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  1. Linlin Huang
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  2. Da Li
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Correspondence to Yujie Feng.

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Huang, L., Li, D., Liu, J. et al. Enhanced mass transfer and service time of mesh Ti/Sb-SnO2 electrode for electro-catalytic oxidation of phenol. Environ Sci Pollut Res 27, 42072–42081 (2020). https://doi.org/10.1007/s11356-020-10070-1

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