Adsorption Studies of Ternary Metal Ions (Cs<sup>+</sup>, Sr<sup>2+</sup>, and Co<sup>2+</sup>) from Water Using Zeolite@Magnetic Nanoparticles (Z@Fe<sub>3</sub>O<sub>4</sub> NPs)
The mixture of three metal ions (Cs<sup>+</sup>, Sr<sup>2+</sup>, and Co<sup>2+</sup>) is commonly found in radioactive waste, which induces several negative health effects. The removal of multiple metal ions is a true challenge for researchers due to the competit...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-10-01
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| Series: | Inorganics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6740/12/11/276 |
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| Summary: | The mixture of three metal ions (Cs<sup>+</sup>, Sr<sup>2+</sup>, and Co<sup>2+</sup>) is commonly found in radioactive waste, which induces several negative health effects. The removal of multiple metal ions is a true challenge for researchers due to the competitive adsorption of ions onto adsorbents. In this study, three metal ions, namely Cs<sup>+</sup>, Sr<sup>2+</sup>, and Co<sup>2+</sup>, have been successfully removed simultaneously from water using zeolite@magnetic nanoparticles (Z@Fe<sub>3</sub>O<sub>4</sub> NPs). The optimized condition for the adsorption of ternary metal ions was obtained at an adsorbent weight of 0.2, pH of 6.0~7.0, and contact time of 60 min. The adsorption mechanism of ternary metal ions onto the surface of Z@Fe<sub>3</sub>O<sub>4</sub> NPs was studied using the Pseudo-first-order, Pseudo-second-order, Elovich, and Intra-particle diffusion models. The Dubinin–Radushkevich Temkin, Freundlich, and Langmuir isotherm models were used to study the isotherm adsorption. The ternary metal ion adsorption (Cs<sup>+</sup>, Sr<sup>2+</sup>, and Co<sup>2+</sup>) on Z@Fe<sub>3</sub>O<sub>4</sub> NPs was followed by the Pseudo-second-order model (PSO) with correlation coefficient (R<sup>2</sup>) range of 0.9826–0.9997. Meanwhile, the adsorption isotherms of ternary metal ions on Z@Fe<sub>3</sub>O<sub>4</sub> NPs were in line with the Langmuir model with R<sup>2</sup> values higher than 0.9206, suggesting monolayer chemisorption with maximum adsorption capacities of 48.31, 15.02, and 10.41 mg/g for Cs<sup>+</sup>, Sr<sup>2+</sup>, and Co<sup>2+</sup>, respectively. Thus, the selectivity trend in the ternary metal ions system towards the Z@Fe<sub>3</sub>O<sub>4</sub> NPs is observed to be Cs<sup>+</sup> > Sr<sup>2+</sup> > Co<sup>2+</sup>, which indicates that the competitive effect of Cs<sup>+</sup> is the strongest compared to Sr<sup>2+</sup> and Co<sup>2+</sup>ions. |
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| ISSN: | 2304-6740 |