Enhanced mass transfer and service time of mesh Ti/Sb-SnO 2 electrode for electro-catalytic oxidation of phenol
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RESEARCH ARTICLE
Enhanced mass transfer and service time of mesh Ti/Sb-SnO2 electrode for electro-catalytic oxidation of phenol Linlin Huang 1 & Da Li 2 & Junfeng Liu 1 & Lisha Yang 1 & Changchao Dai 1 & Nanqi Ren 1 & Yujie Feng 1 Received: 26 April 2020 / Accepted: 8 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
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. Keywords Sb-doped titanium-based SnO2 . Mesh substrate . Hydroxyl radical generation . Electric potential simulation . Mass transfer
Introduction Electro-catalytic oxidation of toxic and refractory organics in wastewater has drawn considerable research attention due to its advantages such as simplicity in operation and structure, high oxidation capability, and environmental compatibility
Linlin Huang and Da Li contributed equally to this work. Responsible Editor: Philipp Gariguess Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10070-1) contains supplementary material, which is available to authorized users. * Yujie Feng [email protected] 1
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
2
School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
(Canizares et al. 2007; Cao et al. 2009; Chen et al. 2014; Feng et al. 2010; Samet et al. 2010; Wei et al. 2011a, b). This degradation process is primarily dependent on the generation of powerful oxygen-bas
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