High Removal Efficiency of Diatomite-Based X Zeolite for Cu<sup>2+</sup> and Zn<sup>2+</sup>
Diatomite-based X zeolite was obtained and its crystallinity, morphology, and interface properties were investigated by XRD, BET, SEM, EDS, and XRF. The obtained X zeolite possessed a unique meso-microporous structure and showed good ion exchange properties for Cu<sup>2+</sup> and Zn<...
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| Auteurs principaux: | , , , |
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| Format: | article |
| Langue: | EN |
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MDPI AG
2021
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| Sujets: | |
| Accès en ligne: | https://doaj.org/article/7f9cd7d864d3447c9e5798fb20f3d59a |
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| Résumé: | Diatomite-based X zeolite was obtained and its crystallinity, morphology, and interface properties were investigated by XRD, BET, SEM, EDS, and XRF. The obtained X zeolite possessed a unique meso-microporous structure and showed good ion exchange properties for Cu<sup>2+</sup> and Zn<sup>2+</sup>. The pseudo-second-order model and Langmuir isotherm model can best describe the adsorption kinetics and isotherms of Cu<sup>2+</sup> and Zn<sup>2+</sup>, respectively. The maximal adsorption capacities of X zeolite for Cu<sup>2+</sup> and Zn<sup>2+</sup> were 146 and 195 mg/g at 323 K, respectively. Meanwhile, the adsorption process for Cu<sup>2+</sup> and Zn<sup>2+</sup> were chemical adsorption and ion exchange, respectively. Furthermore, the adsorption data turned out to be an endothermic and spontaneous process. Compared with other reported materials, the adsorption capacity of X zeolite synthesized from diatomite was among the highest. Therefore, it could be a promising adsorbent for the disposal of wastewater that contains metal ions. |
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