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Adsorption of Srsup.2+ from Synthetic Waste Effluents Using Taiwan Zhi-Shin Bentonite
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Adsorption of Srsup.2+ from Synthetic Waste Effluents Using Taiwan Zhi-Shin Bentonite
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Journal Article
Adsorption of Srsup.2+ from Synthetic Waste Effluents Using Taiwan Zhi-Shin Bentonite
2025
Overview
This study investigated strontium (Sr[sup.2+]) adsorption by Taiwan Zhi-Shin bentonite (cation exchange capacity (CEC): 80–86 meq 100 g[sup.−1]) using Sr(NO[sub.3])[sub.2]-simulated nuclear waste. Kinetic analysis revealed pseudo-second-order adsorption kinetics, achieving 95% Sr[sup.2+] removal within 5 min at pH 9. Isothermal studies showed a maximum capacity of 0.28 mmol g[sup.−1] (56 meq 100 g[sup.−1]) at 15 mmol L[sup.−1] Sr[sup.2+], accounting for 65–70% CEC and fitting the Freundlich model. Cation exchange was the dominant mechanism (84% contribution), driven by Sr[sup.2+] displacing interlayer Ca[sup.2+]. Alkaline conditions (pH > 9) enhanced adsorption through improved surface charge and electrostatic attraction. Thermodynamic studies demonstrated temperature-dependent behavior: increasing temperature reduced adsorption at 0.01 mM Sr[sup.2+] but increased efficiency at 10 mM. Na[sup.+] addition suppressed adsorption, aligning with cation exchange mechanisms. Molecular dynamics simulations identified hydrated Ca[sup.2+]-Sr[sup.2+] water bridges interacting with bentonite via hydrogen-bonding networks. The material exhibits rapid kinetics (5 min equilibrium), alkaline pH optimization, and resistance to ion interference, making it suitable for emergency Sr[sup.2+] treatment. It shows promise as a cost-effective and good performing adsorbent for radioactive waste solutions.
Publisher
MDPI AG
