Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 4, Issue 2, Pages 1664-1673Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2015.11.031
Keywords
Ammonium; Zeolite; Removal; Organic acid
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The present study was conducted to evaluate the possibility of using natural Iranian zeolite for ammonium (NH4+) removal from aqueous solutions. Batch experiments were performed as a function of pH, adsorbent dose, contact time, temperature, initial concentration, anions, cations and low-molecular-weight organic acids (LMWOAs). The optimum conditions for the effective adsorption of NH4+ ions onto natural zeolite were found to be pH 7.0, temperature 298 degrees K, and contact time 30 min. The adsorption kinetics was best represented by a pseudo-second-order model and the NH4+ adsorption data on natural zeolite fitted better to Langmuir model than Freundlich, Tempkin and D-R models. The presence of other cations and anions in the solution affected the removal of NH4+ onto zeolite and the selectivity order was K > Na > Ca > Mg, while in presence of anions the order was Cl > PO4 > SO4. The presence of LMWOAs increased the adsorption of NH4+ onto the natural zeolite. The thermodynamic properties of NH4+ adsorption indicated that the adsorption was spontaneous and exothermic. Based on these results, it can be concluded that the natural Iranian zeolite can be used to remove NH4+ ion from domestic and industrial wastewater. (C) 2016 Published by Elsevier Ltd.
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