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- Title
Equilibrium and kinetic studies on adsorption of hexavalent chromium from aqueous solutions using solid-state iron exchange bentonite.
- Authors
Abnous, Negin; Ghorbanpour, Mohammad; Shayesteh, Keivan
- Abstract
The adsorption of hexavalent chromium by bentonite has been improved using solid-state iron exchange method. To understand the adsorption mechanisms and characteristics of parent bentonite and solid-state iron exchanged bentonite (SSIEB), various techniques including X-ray diffraction, Brunauer-Emmett-Teller analysis, Fourier-transform infrared spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were employed. The results revealed that iron ions replaced some of the calcium and magnesium in bentonite during solid-state ion exchange, but no significant changes in morphology were observed. The d-spacing of the montmorillonite changed from 14.90 Å in the parent bentonite to 14.50, 14.60, and 14.90 Å for iron-exchanged bentonite prepared in 1, 3, and 5 min, respectively. The surface area increased from 44.5 m²/g for bentonite to higher values (51.3-53.1 m²/g) due to the solid-state iron exchange process. The chromate ion adsorption from aqueous solution increased from 5.61% to 18.85% for the sample synthesized at a temperature of 100°C and a time of 3 min. Consequently, the chromate adsorption capacity of the optimal SSIEB was nearly three times higher than that of pure bentonite. The data obtained from the solid-phase ion exchange method demonstrate that modified SSIEB can serve as an effective adsorbent in the absorption process.
- Subjects
IRON; HEXAVALENT chromium; BENTONITE; CHROMIUM removal (Water purification); AQUEOUS solutions; ADSORPTION (Chemistry); IRON ions
- Publication
Desalination & Water Treatment, 2023, Vol 312, p100
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.29982