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Received May 22, 2014
Accepted November 23, 2014
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Phosphate removal from aqueous solutions on fly ash with medium calcium content
International College, Qingdao University, Qingdao 266071, China 1College of Chemistry & Chemical Engineering, Qingdao University, Qingdao 266071, China
Korean Journal of Chemical Engineering, July 2015, 32(7), 1323-1326(4), 10.1007/s11814-014-0342-6
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Abstract
Excessive discharge of phosphate into water bodies may cause eutrophication and affect the natural water quality. The adsorption behavior of phosphate from aqueous solution on fly ash was investigated by a medium calcium fly ash in weak acid solution. Experimental findings showed that removal of phosphate was pH-dependent with the maximum adsorption capacity at the initial solution pH of 5.0-7.0. The increment in the initial phosphate concentration and temperature enhanced the adsorption capacity. Kinetic studies of phosphate followed the pseudo-second-order model. The predominant removal mechanism was ligand exchange reaction on the basis of desorption experiment. The adsorbed phosphate was difficult to leach to the environment from the waste fly ash.
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