Tratamento de águas contaminadas com glifosato mediante adsorção e eletrólise acopladas
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2023-06-23
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Universidade Federal de Goiás
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Glyphosate is a wide-spectrum herbicide extensively used in Brazil and worldwide. Its presence in surface and ground water has alerted to the need for alternative removal treatments, since it is a refractory pollutant to conventional water and wastewater treatments. Among the alternative treatments, electrochemical advanced oxidation processes emerge as an option. Nevertheless, these processes are often limited by mass transportation, owing to the low concentration of the target molecules found in hydric bodies. This makes necessary the addition of pre-concentration stages for the ulterior electrochemical treatment. The present work brings a possible alternative by the combination of a previous pollutant accumulation process by active carbon adsorption, followed by the electrochemical regeneration of the pollutant adsorbed to, again, reinitiate a new cycle. In the study of glyphosate adsorption onto activated carbon, the effects of pH and ionic strength were investigated. In the electrochemical regeneration, the effect of current density and the reuse of the adsorbent for multiple treatment cycles were evaluated. Results indicated satisfactory pollutant retention capacity by the adsorbent, especially under acid pH and absence of electrolytes (36 mg g-1). Furthermore, the electrochemical regeneration demonstrated the ability to achieve total mineralization of the pollutant in anodic oxidation on boron-doped diamond electrode and maintenance of 89%, on average, of the specific surface area of the adsorbent after five adsorption/regeneration cycles.
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PEREIRA, É. M. Tratamento de águas contaminadas com glifosato mediante adsorção e eletrólise acopladas. 2023. 82 f. Dissertação (Mestrado em Engenharia Química) - Instituto de Química, Universidade Federal de Goiás, Goiânia, 2023.