Conversion of coal fly ash into zeolite and heavy metal removal characteristics of the products |
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| Authors: | Min-Gyu Lee Gyeongbeom Yi Byoung-Joon Ahn Felicity Roddick |
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| Affiliation: | (1) Division of Chemical Engineering, Pukyong National University, 608-739 Pusan, Korea;(2) Department of Chemistry Education, Chonbuk National University, 561-756 Chonju, Korea;(3) Department of Chemical and Metallurgical Engineering, Royal Melbourne Institute of Technology, 3001, Victoria, Australia |
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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-P1, 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-P1 exhibited the highest adsorption capacity with a maximum value of about 1.29 mmole Pb g-1 and had a strong affinity for Pb2+ ion. The metal ion selectivity of Na-P1 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-P1 fitted
the Freundlich rather than the Langmuir isotherm. |
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| Keywords: | Fly Ash Synthetic Zeolite Adsorption Heavy Metal Adsorption |
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