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Kinetic and equilibrium studies of the removal of ammonium ions from aqueous solution by rice husk ash-synthesized zeolite Y and powdered and granulated forms of mordenite

Mohd. Yusof, Alias and Nik Malek, Nik Ahmad Nizam and Keat, Lee Kian and Ibrahim, Zaharah and Abdul Majid, Zaiton (2010) Kinetic and equilibrium studies of the removal of ammonium ions from aqueous solution by rice husk ash-synthesized zeolite Y and powdered and granulated forms of mordenite. Journal Of Hazardous Materials, 174 (13). 380 - 385. ISSN 0304-3894

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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2009.09.063

Abstract

The removal of ammonium from aqueous solutions using zeolite NaY prepared from a local agricultural waste, rice husk ash waste was investigated and a naturally occurring zeolite mordenite in powdered and granulated forms was used as comparison. Zeolite NaY and mordenite were well characterized by powder X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis and the total cation exchange capacity (CEC). CEC of the zeolites were measured as 3.15, 1.46 and 1.34 meq g-1 for zeolite Y, powdered mordenite and granular mordenite, respectively. Adsorption kinetics and equilibrium data for the removal of NH4+ ions were examined by fitting the experimental data to various models. Kinetic studies showed that the adsorption followed a pseudo-second-order reaction. The equilibrium pattern fits well with the Langmuir isotherm compared to the other isotherms. The monolayer adsorption capacity for zeolite Y (42.37 mg/g) was found to be higher than that powdered mordenite (15.13 mg/g) and granular mordenite (14.56 mg/g). Thus, it can be concluded that the low cost and economical rice husk ash-synthesized zeolite NaY could be a better sorbent for ammonium removal due to its rapid adsorption rate and higher adsorption capacity compared to natural mordenite.

Item Type:Article
Uncontrolled Keywords:zeolite Y, mordenite, ammonium removal, kinetic study, isotherm equilibrium study
Subjects:Q Science
Divisions:Science
ID Code:26298
Deposited By: Liza Porijo
Deposited On:29 Jun 2012 07:53
Last Modified:01 Aug 2012 03:50

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