Feroxyhyte - from synthesis and characterization to application

Chemphyschem. 2024 Jan 24:e202300836. doi: 10.1002/cphc.202300836. Online ahead of print.ABSTRACTFeroxyhyte (δ-FeOOH) was synthesized and characterized using X-ray diffractometry (XRD), simultaneous thermal analysis (STA), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDS), and low-temperature nitrogen adsorption-desorption measurements. Its potential application as adsorbent of an anionic and cationic dyes such as C.I. Acid Violet 1 (AV1) and C.I. Basic Blue 3 (BB3) was investigated by determining the adsorption capacities based on the Langmuir (36.6 mg/g for AV1 and 187 mg/g for BB3), Freundlich and Dubinin-Radushkevich isotherm models. Adsorption of AV1 and BB3 by δ-FeOOH drops with the presence of additives such as cationic and anionic surfactants (CTAB, SDS) and ionic polymers (PAA, PEI). The surface and electrokinetic properties of examined suspensions were also described. They include determination of the solid surface charge density and the zeta potential, as well as values of point of zero charge and isoelectric point of feroxyhyte particles without and with adsorbed layers of organic substances. Their analysis made possible to propose the most probable structure of electrical double layer formed at the iron mineral/aqueous solution interface.PMID:38266193 | DOI:10.1002/cphc.202300836

Source: Chemphyschem - January 24, 2024 Category: Chemistry Authors: Ma łgorzata Wiśniewska Monika Wawrzkiewicz Teresa Urban Stanis ław Chibowski Grzegorz Rzepa Justyna Ha łabuza Tomasz Bajda Source Type: research