Assessing the viability of electro-absorption and photoelectro-absorption for the treatment of gaseous perchloroethylene
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ADVANCED OXIDATION/REDUCTION TECHNOLOGIES: AN PERSPECTIVE FROM IBEROAMERICAN COUNTRIES
Assessing the viability of electro-absorption and photoelectro-absorption for the treatment of gaseous perchloroethylene Martín Muñoz-Morales 1 & Montse Castañeda-Juárez 2 & Fernanda Lourdes Souza 3 & Cristina Saez 1 & Pablo Cañizares 1 & Verónica Martínez-Miranda 2 & Ivonne Linares-Hernández 2 & Manuel Andrés Rodrigo 1 Received: 2 March 2020 / Accepted: 10 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This work focuses on the development of electro-absorption and photoelectro-absorption technologies to treat gases produced by a synthetic waste containing the highly volatile perchloroethylene (PCE). To do this, a packed absorption column coupled with a UV lamp and an undivided electrooxidation cell was used. Firstly, it was confirmed that the absorption in a packed column is a viable method to achieve retention of PCE into an absorbent-electrolyte liquid. It was observed that PCE does not only absorb but it was also transformed into phosgene and other by-products. Later, it was confirmed that the electro-absorption process influenced the PCE degradation, favoring the transformation of phosgene into final products. Opposite to what is expected, carbon dioxide is not the main product obtained, but carbon tetrachloride and trichloroacetic acid. Both species are also hazardous but their higher solubility in water opens possibilities for a successful and more environmental-friendly removal. The coupling with UVirradiation has a negative impact on the degradation of phosgene. Finally, a reaction mechanism was proposed for the degradation of PCE based on the experimental observations. Results were not as expected during the planning of the experimental work but it is important to take in mind that PCE decomposition occurs in wet conditions, regardless of the applied technology, and this work is a first approach to try to solve the treatment problems associated to PCE gaseous waste flows in a realistic way. Keywords VOCs removal . Perchloroethylene . Electro-absorption . UV irradiation Highlights • Absorption into electrolytes can help to retain PCE from gas effluents. • Phosgene is produced by wet decomposition of PCE. • Electro-absorption favors transformation of phosgene into CCl4 and TCA. • Almost no mineralization of gaseous streams was attained. • UV-irradiation does not have a significant influence. • Reaction pathways with main liquid and gaseous by-products were proposed. Martín Muñoz-Morales and Montse Castañeda-Juárez contributed equally to this work. Responsible Editor: Sami Rtimi * Fernanda Lourdes Souza [email protected]
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Instituto Interamericano de Tecnología y Ciencias del Agua, Universidad Autónoma del Estado de México, Km.14.5, carretera Toluca-Atlacomulco, C.P. 50200 San Cayetano, Toluca, Estado de México, Mexico
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Institute of Chemistry of São Carlos, University of São Paulo, P.O. Box 780, São Carlos, SP 13560-970, Brazil
* Manuel Andrés Rodrigo [email protected]
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