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Removal of Ca2+ and Zn2+ from aqueous solutions by zeolites NaP and KP

Mohd. Yusof, Alias and Nik Malek, Nik Ahmad Nizam and N. A., Kamaruzaman and M., Adil (2010) Removal of Ca2+ and Zn2+ from aqueous solutions by zeolites NaP and KP. Environmental Technology, 31 (1). 41 - 46. ISSN 0959-3330

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Official URL: http:dx.doi.org/10.1080/09593330903313794

Abstract

Zeolites P in sodium (NaP) and potassium (KP) forms were used as adsorbents for the removal of calcium (Ca2+) and zinc (Zn2+) cations from aqueous solutions. Zeolite KP was prepared by ion exchange of K+ with Na+ which neutralizes the negative charge of the zeolite P framework structure. The ion exchange capacity of K+ on zeolite NaP was determined through the Freundlich isotherm equilibrium study. Characterization of zeolite KP was determined using infrared spectroscopy and X-ray diffraction (XRD) techniques. From the characterization, the structure of zeolite KP was found to remain stable after the ion exchange process. Zeolites KP and NaP were used for the removal of Ca and Zn from solution. The amount of Ca2+ and Zn2+ in aqueous solution before and after the adsorption by zeolites was analysed using the flame atomic absorption spectroscopy method. The removal of Ca2+ and Zn2+ followed the Freundlich isotherm rather than the Langmuir isotherm model. This result also revealed that zeolite KP adsorbs Ca2+ and Zn2+ more than zeolite NaP and proved that modification of zeolite NaP with potassium leads to an increase in the adsorption efficiency of the zeolite. Therefore, the zeolites NaP and KP can be used for water softening (Ca removal) and reducing water pollution/toxicity (Zn removal).

Item Type:Article
Uncontrolled Keywords:zeolite NaP, zeolite KP, calcium removal, zinc removal
Subjects:Q Science
Divisions:Science
ID Code:26639
Deposited By: Liza Porijo
Deposited On:18 Jul 2012 03:43
Last Modified:06 Aug 2012 07:04

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