Journal of New Technology and Materials
Volume 11, Numéro 1, Pages 63-80
2021-06-26
Theoretical Study Of The Degradation Of Amoxicillin By Interaction With The Hydroxyl Radical (.oh)
Authors : Masmoudi Rida . Khettaf Sami . Kahlat Chaimaa . Dibi Ammar . Bouchekioua Saad . Chinar Tahani-achouak .
Abstract
β-Lactam antibiotics are commonly used to avoid disease in humans, and antibiotics that have been excreted in the environment have caused significant concerns. Amoxicillin belongs to the penicillin, which is the most widely, consumed antibiotics that have resistance to conventional biological water treatment methods. The highest functional richness of this molecule makes it very difficult to establish the AMX degradation pathway. A better alternative to removing these toxic and recalcitrant compounds from wastewater effluents and causing their mineralization will be advanced oxidation processes (AOPs). They have emerged as a promising form of technology for pollutant degradation, converting them into safe products like CO2 and H2O. They’re oxidative processes based on the generation of highly oxidizing species like hydroxyl radicals. Our study uses functional density theory (DFT) to clarify the mechanisms of reactions between (OH.) and AMX. This interaction is done either by the abstraction of hydrogen or the addition of the radical hydroxyl on the molecule; the results reveal that the addition of radicals (OH.) that produce intermediates (add) is kinetically and thermodynamically favoured over the intermediate structures (abs) that are resulted from the abstraction of hydrogen. Thus, the Pkcsm server used to follows the toxicity study, which showed that amoxicillin/ion amoxicillin and their by-products. Could disrupt normal liver function and induce liver damage. they're toxic to the aqueous environment, where the AMX/ion AMX and their by-products obtained by the abstraction of an H+ are less toxic to Minnow fish than those obtained by the addition of OH (2.6 log mM),(3.9 log mM), respectively.
Keywords
amoxicillin; Degradation; Toxicity; Mechanism; DFT; Hydroxyl radical; Sonolyse.
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