|
1
|
Electrolytic removal of volatile organic compounds: Keys to understand the process. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116259] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
|
2
|
Escalona-Durán F, Muñoz-Morales M, Souza FL, Sáez C, Cañizares P, Martínez-Huitle CA, Rodrigo MA. Cobalt mediated electro-scrubbers for the degradation of gaseous perchloroethylene. CHEMOSPHERE 2021; 279:130525. [PMID: 33866102 DOI: 10.1016/j.chemosphere.2021.130525] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 04/03/2021] [Accepted: 04/05/2021] [Indexed: 06/12/2023]
Abstract
This work focuses on the treatment of gaseous perchloroethylene (PCE) using electro-scrubbing with diamond electrodes and cobalt mediators. PCE was obtained by direct desorption from an aqueous solution containing 150 mg L-1, trying to a real pollution case. The electro-scrubber consisted of a packed absorption column connected with an undivided electrochemical cell. Diamond anodes supported on two different substrates (tantalum and silicon) were used and the results indicated that Ta/BDD was more successful in the production of Co (III) species and in the degradation of PCE. Three experimental systems were studied for comparison purposes: absorbent free of Co (III) precursors, absorbent containing Co (III) precursors, and absorbent containing Co (III) precursors undergoing previous electrolysis to the electro-scrubbing to facilitate the accumulation of oxidants. The most successful option was the last, confirming the important role of mediated electrochemical processes in the degradation of PCE. Trichloroacetic acid (TCA) and carbon tetrachloride (CCl4) were found as the primary reaction products and ethyl chloroacetate esters were also identified. A comprehensive mechanism of the processes happening inside electro-scrubber is proposed.
Collapse
Affiliation(s)
- F Escalona-Durán
- Institute of Chemistry, Environmental and Applied Electrochemical Laboratory, Federal University of Rio Grande Do Norte, Lagoa Nova, CEP 59078-970, Natal, RN, Brazil
| | - M Muñoz-Morales
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla La Mancha, Campus Universitario S/n, 13071, Ciudad Real, Spain
| | - F L Souza
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla La Mancha, Campus Universitario S/n, 13071, Ciudad Real, Spain
| | - C Sáez
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla La Mancha, Campus Universitario S/n, 13071, Ciudad Real, Spain
| | - P Cañizares
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla La Mancha, Campus Universitario S/n, 13071, Ciudad Real, Spain
| | - C A Martínez-Huitle
- Institute of Chemistry, Environmental and Applied Electrochemical Laboratory, Federal University of Rio Grande Do Norte, Lagoa Nova, CEP 59078-970, Natal, RN, Brazil
| | - M A Rodrigo
- Department of Chemical Engineering, Faculty of Chemical Sciences & Technologies, University of Castilla La Mancha, Campus Universitario S/n, 13071, Ciudad Real, Spain.
| |
Collapse
|
|
3
|
Continuous electro-scrubbers for the removal of perchloroethylene: Keys for selection. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115267] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|