tudy of Antibiotics Adsorption onto the Binary of Oxide Mixtures System of Goethite and MnO2

Résumé fourni par la source

In the environment, adsorption is important for the movement and fate of organic pollutants. The study investigates the oxide mixture impact (i.e., MnO2 and α-FeOOH) on the adsorption of Flumequine (FLU), with a view to simulating soil heterogeneity. Demonstration of FLU binding to these particle surfaces was achieved using batch sorption experiments, HPLC analyses, and ATR-FTIR spectroscopy. We investigated how synthetic α-FeOOH and MnO2 particle surfaces interact to understand that affects FLU adsorption at different NaCl concentrations. ATR-FTIR results revealed the establishment of a metallo-bonded complex from neutral to acidic pH and a highly H-bonded complex at basic pH. We note strong attraction between FLU and MnO₂ due to the lower zero charge/isoelectric point of this mineral (2.3-2.5) compared to goethite (8.9-9.5). Therefore, the FLU adsorption onto solids is as follows: α-FeOOH + MnO2 > MnO2 > α-FeOOH, with a percentage yield of 42%, 39%, and 36%, respectively, suggesting a slight superiority for the solid mixture.

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