An azo dye, acid orange (AO7), and an antibiotic, chloramphenicol (CAP), were selected as target compounds to evaluate the efficiency of zero-valent iron nanoparticles (nZVI) in the removal of contaminants of emerging concern (CECs). Synthesized nZVI were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis before and after the treatment process. The removal of both contaminants increased with of nZVI dosage (0.1125 g/L - 1 g/L), from 41 % up to 93 % for CAP and from 17 % up to 97 % for AO7, after 10 min of reaction. The SEM analysis performed at the end of the treatment revealed that, as result of the oxidation of nZVI, the chain-like structure completely disappeared whereas Fe and O were evenly distributed on the sample surface. At acidic conditions the removal of CAP and AO7 after 10 min of reaction reached 87 % and 84 %, respectively. At alkaline condition 69 % and 46 % of CAP and AO7 removal could be achieved after 80 min of reaction. The treatments with nZVI greatly reduced the toxicity of the starting CAP and AO7 solutions for all Artemia franciscana life stages but further efforts are necessary to achieve nZVI immobilization onto macroscopic supports.

Removal and toxicity effects of chloramphenicol and acid orange solutions using zero-valent iron nanoparticles

Cardito, Alice;Sacco, Olga
;
Vaiano, Vincenzo;Lofrano, Giusy
;
Carotenuto, Maurizio
2025-01-01

Abstract

An azo dye, acid orange (AO7), and an antibiotic, chloramphenicol (CAP), were selected as target compounds to evaluate the efficiency of zero-valent iron nanoparticles (nZVI) in the removal of contaminants of emerging concern (CECs). Synthesized nZVI were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis before and after the treatment process. The removal of both contaminants increased with of nZVI dosage (0.1125 g/L - 1 g/L), from 41 % up to 93 % for CAP and from 17 % up to 97 % for AO7, after 10 min of reaction. The SEM analysis performed at the end of the treatment revealed that, as result of the oxidation of nZVI, the chain-like structure completely disappeared whereas Fe and O were evenly distributed on the sample surface. At acidic conditions the removal of CAP and AO7 after 10 min of reaction reached 87 % and 84 %, respectively. At alkaline condition 69 % and 46 % of CAP and AO7 removal could be achieved after 80 min of reaction. The treatments with nZVI greatly reduced the toxicity of the starting CAP and AO7 solutions for all Artemia franciscana life stages but further efforts are necessary to achieve nZVI immobilization onto macroscopic supports.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4894516
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