Abstract
A clinoptilolite-type natural zeolite was pretreated by HC1, NaOH, and NaCl solutions to improve the ion-exchange capacities for heavy metal ions such as copper, lead, cadmium, and cesium. The pretreated natural zeolite was experimentally investigated based on chemical analyses, X-ray diffraction, and BET experiments etc. From experimental data, it was shown that the pretreatment with NaCl gave the best ion-exchange capacity for all metal ions encountered. The ion-exchange capacity of the NaCl-treated sample is comparable with that of a commercialized natural zeolite, chabazite. On the other hand, the HCl-treated sample has very low ion-exchange capacities for all metal ions even though it has high specific surface area and total pore volume. It was proven by chemical analyses that a strong acid like HC1 can damage the structure of the zeolite by extracting aluminum and iron from their skeletal units.
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Lee, D.H., Kim, S.J. & Moon, H. Preparation of a clinoptilolite-type korean natural zeolite. Korean J. Chem. Eng. 16, 525–531 (1999). https://doi.org/10.1007/BF02698279
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DOI: https://doi.org/10.1007/BF02698279