New MMO coatings for electro-refinery applications: Promoting the production of carboxylates

被引：2

作者：

Castro, Raira S.S. ^{[1
,2
,4
]}

Santos, Géssica O.S. ^{[3
]}

Lanza, Marcos R.V. ^{[3
]}

Salaza-Banda, Giancarlo R. ^{[1
,2
]}

Eguiluz, Katlin I.B. ^{[1
,2
]}

Rodrigo, Manuel A. ^{[4
]}

Sáez, Cristina ^{[4
]}

机构：

[1] Electrochemistry and Nanotechnology Laboratory, Institute of Technology and Research (ITP), SE, Aracaju

[2] Graduate Program in Process Engineering (PEP), Universidade Tiradentes, SE, Aracaju

[3] University of São Paulo, São Carlos

[4] Chemical Engineering Department, University of Castilla-La Mancha, Ciudad Real

来源：

Chemosphere | 2024年 / 363卷

基金：

巴西圣保罗研究基金会;

关键词：

Added value products; Carboxylates; Electrochemical oxidation; Mixed metal oxide anodes; Organic electrorefinery;

D O I：

10.1016/j.chemosphere.2024.142941

中图分类号：

学科分类号：

摘要：

Within the new circular economy paradigm, this work evaluates the performance of tailored mixed metal oxides (MMO) anodes, based on ruthenium and antimony, for their application into an electrochemically-assisted organic refinery process. This process is designed to transform pollutants into value-added products with minimal mineralization. Oxidation of synthetic wastes consisting of phenol solutions was used to validate the electrochemical conversion of phenolic wastes into carboxylates, which are then considered as bricks to be used for electrosynthesis or to produce fuels. The MMO anodes were manufactured using two synthesis routes (Pechini method and ionic liquid method), each followed by one of three different heating treatments: furnace, microwave, and CO2 laser. The selection of the optimal electrode for the organic electrorefinery was based on a combination of physical and electrochemical properties, degradation performance of phenol to carboxylates, and long-term stability, looking for a truly sustainable solution. Results indicate that anodes synthesized by the ionic liquid (IL) method, regardless of the heating treatment, demonstrated superior performance, with larger active areas (with furnace 82 mC cm−2, microwave 97 mC cm−2, and laser 127 mC cm−2) and higher phenol degradation rates, resulting in a greater generation of carboxylates during electrolysis, yielding primarily oxalate and achieving up to 40% conversion with furnace heating. However, laser-treated anodes exhibited greater stability than furnace-made ones, attributed to the formation of an insulating TiO2 layer. Although the electrode with the longest service life did not show the best catalytic properties for minimizing mineralization, the observed variations in coatings with identical chemical compositions highlight the importance of this research. This study positions itself at the forefront of developing more efficient and sustainable electrochemical technologies for organic waste treatment. © 2024 The Authors

引用

共 33 条

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