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Conversion of Coal Fly Ash into Zeolite and Heavy Metal Removal Characteristics of the Products

Division of Chemical Engineering, Pukyong National University, Pusan 608-739, Korea 1Department of Chemistry Education, Chonbuk National University, Chonju 561-756, Korea 2Department of Chemical and Metallurgical Engineering, Royal Melbourne Institute of Technology, Victoria 3001, Australia
mglee@dolphin.pknu.ac.kr
Korean Journal of Chemical Engineering, May 2000, 17(3), 325-331(7), 10.1007/BF02699048
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Abstract

Fly ash obtained from a power generation plant was used for synthesizing zeolite. Zeolites could be readily synthesized from the glassy combustion residues and showed potential for the removal of heavy metal ions. By the use of different temperatures and NaOH concentration, five different zeolites were obtained : Na-Pl, faujasite, hydroxy sodalite, analcime, and cancrinite. The synthesized zeolites had greater adsorption capabilities for heavy metals than the original fly ash and natural zeolites. Na-Pl exhibited the highest adsorption capacity with a maximum value of about 1.29 mole Pb g-1 and had a strong affinity for Pb2+ ion. The metal ion selectivity of Na-Pl was determined as : Pb2+ > Cu2+ > Cd2+ > Zn2+, consistent with the decreasing order of the radius of hydrated metal ion. the adsorption isotherm for lead by Na-Pl fitted the Freundlich rather than the Langumuir isotherm.

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