The Impact of Ferrous and Ferric Ions on Degradation of Antihypertensive Drug Dihydralazine in Iron-Based Flocculation and Coagulation Methods for Waste Water Treatment
2024
Korać Jačić, Jelena | Bartolić, Dragana | Milenković, Milica R.
Dihydralazine (dHZ) and hydralazine are hydrazine derivatives used as drugs in the treatment of hypertension. These drugs and their metabolites can be long-term pollutants in domestic and pharmaceutical industry waste water due to their high water solubility, low price and frequent use in the treatment of chronic disease. There are many methods for waste water treatment and some of them, such as flocculation, coagulation and advanced oxidation processes, involve the use of iron salts. In this study we investigated the effect of pH on dHZ degradation in the presence of ferrous and ferric ions in aqueous solutions using UV-Vis spectroscopy. It was found that in acidic solution dHZ forms stable complex with ferrous ions. The presence of ferric ions in acidic and neutral aqueous solutions of dHZ led to its degradation, which is faster at lower pH. EPR spectroscopy measurements showed that degradation of dHZ induced by ferric ions proceeds with the formation of OH• and carbon centered dHZ radical.
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Editeur University of Belgrade, Technical faculty in Bor (Serbia)
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