Adsorption of Toxic Metals Using Hydrous Ferric Oxide Nanoparticles Embedded in Hybrid Ion-Exchange Resins

Acid mine drainage (AMD) is a major environmental problem caused by the release of acidic, toxic, and sulfate-rich water from mining sites. This study aimed to develop novel adsorbents for the removal of chromium (Cr(VI)), cadmium (Cd(II)), and lead (Pb(II)) from simulated and actual AMD using hybri...

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Bibliographic Details
Published in:Materials 2024-03, Vol.17 (5), p.1168
Main Authors: Sodzidzi, Zizikazi, Phiri, Zebron, Nure, Jemal Fito, Msagati, Titus A M, de Kock, Lueta-Ann
Format: Article
Language:English
Subjects:
Acid mine drainage
Adsorbents
Adsorption
Cadmium
Chromium
Efficiency
Ferric oxide
Gas flow
Heavy metals
Ion exchange
Ion exchange resins
Iron compounds
Lead
Metal oxides
Mineral industry
Minerals
Mining
Mining industry
Nanoparticles
Raman spectroscopy
Resins
Spectrum analysis
Sulfates
Surface active agents
Zeolites
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Summary:Acid mine drainage (AMD) is a major environmental problem caused by the release of acidic, toxic, and sulfate-rich water from mining sites. This study aimed to develop novel adsorbents for the removal of chromium (Cr(VI)), cadmium (Cd(II)), and lead (Pb(II)) from simulated and actual AMD using hybrid ion-exchange resins embedded with hydrous ferric oxide (HFO). Two types of resins were synthesized: anionic exchange resin (HAIX-HFO) for Cr(VI) removal and cationic exchange resin (HCIX-HFO) for Cd(II) and Pb(II) removal. The resins were characterized using scanning electron microscopy and Raman spectroscopy, which confirmed the presence of HFO particles. Batch adsorption experiments were conducted under acidic and sulfate-enhanced conditions to evaluate the adsorption capacity and kinetics of the resins. It was found that both resins exhibited high adsorption efficiencies and fast adsorption rates for their respective metal ions. To explore the potential adsorption on actual AMD, HCIX-HFO demonstrated significant removal of some metal ions. The saturated HCIX-HFO resin was regenerated using NaCl, and a high amount of the adsorbed Cd(II) and Pb(II) was recovered. This study demonstrates that HFO-embedded hybrid ion-exchange resins are promising adsorbents for treating AMD contaminated with heavy metals.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17051168