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	STUDIA GEOLOGIA - Ediţia nr.1 din 2010

	Articol:	INVESTIGATIONS ON SOME ZEOLITIC VOLCANIC TUFFS FROM CLUJ COUNTY (ROMANIA), USED FOR ZINC IONS REMOVAL FROM AQUEOUS SOLUTION. Autori: HOREA BEDELEAN, ANDRADA MĂICĂNEANU, SILVIA BURCĂ, MARIA STANCA.


	Rezumat: Representative samples of zeolitic tuffs from Măcicaş, Aluniş, and Apahida occurrences (Cluj County, Romania) were investigated using optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and wet chemical analyses. The studied tuff samples are represented mainly by vitric and vitric crystal varieties. The mineral assemblage suggests a rhyodacitic volcanic tuff. Diagenetic alteration led to the formation of zeolites, mainly clinoptilolite. Zn²⁺ removal was performed on some bulk samples: Aluniş (labelled A1), Apahida (Ap), and Măcicaş (M2) grain size of 0.2-0.4 mm. Each sample was chemically modified with HCl 1M (Z-H form) and NaCl + NaOH 1M pH = 10 (Z-Na form). The ionic exchange experiments were performed in a batch reactor (immobile phases) and in a fixed bed column. Ionic exchange efficiencies for the samples considered are presented for static and dynamic regimes. Removal efficiencies higher than 53.97% and exchanged Zn²⁺ quantities higher than 1.05 mg/g were obtained. Therefore, the zeolitic tuffs under investigation are considered to be active in the ionic exchange process and can be used in wastewaters treatment to remove Zn²⁺ ions. The results for all the samples considered in batch and fixed bed experiments are presented by means of cation exchange capacity (CEC) and removal efficiency. Key words: natural zeolites, clinoptilolite, volcanic tuffs, Cluj County, zinc, ionic exchange.




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