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Feroxyhyte - from synthesis and characterization to application
Małgorzata Wiśniewska1, Monika Wawrzkiewicz2, Teresa Urban1
1Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie- Sklodowska University in Lublin, M. Curie-Sklodowska Sq. 3, 20-031, Lublin, Poland.
Summary
Feroxyhyte (δ-FeOOH) effectively adsorbs anionic and cationic dyes, showing high adsorption capacities. Its performance is influenced by surfactants and polymers, impacting surface properties and adsorption mechanisms.
Area of Science:
- Materials Science
- Environmental Chemistry
- Surface Chemistry
Background:
- Feroxyhyte (δ-FeOOH) is a mineral with potential applications in water treatment.
- Dye contamination in water bodies poses significant environmental challenges.
- Understanding adsorption mechanisms is crucial for developing effective dye removal strategies.
Purpose of the Study:
- To synthesize and characterize feroxyhyte (δ-FeOOH).
- To investigate the adsorption of anionic (C.I. Acid Violet 1) and cationic (C.I. Basic Blue 3) dyes onto feroxyhyte.
- To explore the influence of surfactants and polymers on dye adsorption and surface properties.
Main Methods:
- Synthesis and characterization of feroxyhyte using XRD, STA, SEM-EDS, and N2 adsorption-desorption.
- Dye adsorption studies using Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models.
- Surface and electrokinetic property analysis, including zeta potential and point of zero charge.
Main Results:
- Feroxyhyte exhibited significant adsorption capacities for both anionic (36.6 mg/g for AV1) and cationic (187 mg/g for BB3) dyes.
- Adsorption performance was affected by the presence of cationic (CTAB) and anionic (SDS) surfactants, and ionic polymers (PAA, PEI).
- Surface charge density, zeta potential, point of zero charge, and isoelectric point were determined for feroxyhyte with and without adsorbed organic layers.
Conclusions:
- Feroxyhyte is a promising adsorbent for removing anionic and cationic dyes from aqueous solutions.
- Surfactants and polymers significantly alter the adsorption behavior and surface properties of feroxyhyte.
- Analysis of surface and electrokinetic properties provides insights into the electrical double layer structure at the iron mineral/aqueous solution interface.
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