Removal of Fe3+ Ions from Aqueous Solutions by Adsorption on Natural Eco-Friendly Brazilian Palygorskites

This work focuses on the characterization of five palygorskite clays from the Brazilian state of Piaui and their feasibility as eco-friendly adsorbents for the removal of Fe3+ ions from aqueous solutions. For characterization, we applied the techniques of X-ray diffraction (XRD), X-ray fluorescence...

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Published inMining (Basel) Vol. 4; no. 1; pp. 37 - 57
Main Authors Middea, Antonieta, Spinelli, Luciana dos Santos, de Souza Junior, Fernando Gomes, Fernandes, Thais de Lima Alves Pinheiro, de Lima, Luiz Carlos, Barthem, Vitoria Maria Tupinamba Souza, Gomes, Otávio da Fonseca Martins, Neumann, Reiner
Format Journal Article
LanguageEnglish
Published Rouyn-Noranda MDPI AG 01.01.2024
Subjects
Adsorption
Clay
Contact angle
Density measurement
Electron microscopes
Experiments
Infrared spectroscopy
Ions
Iron
iron removal
Langmuir isotherm
Mineralogy
Morphology
palygorskite
Particle size
wastewater
X-ray diffraction
X-ray fluorescence
Zeta potential
Brazil
United Kingdom > UK
United States > US
Germany
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Summary:This work focuses on the characterization of five palygorskite clays from the Brazilian state of Piaui and their feasibility as eco-friendly adsorbents for the removal of Fe3+ ions from aqueous solutions. For characterization, we applied the techniques of X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS), size distribution measurements, density measurement by He pycnometry, superconducting quantum interference device (SQUID) magnetometry, Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA/DTA), zeta potential measurement, hydrophobicity determination by contact angle, Brunauer–Emmett–Teller surface area analysis (BET technique) and atomic force microscopy (AFM). Batch experiments were performed in function of process parameters such as contact time and initial concentration of Fe3+. The natural palygorskites (Palys) had excellent performance for the removal of Fe3+ from aqueous solutions by adsorption (around 60 mg/g), and the Langmuir is supposedly the best model fitted the experimental data.
ISSN:2673-6489
2673-6489
DOI:10.3390/mining4010004