Reaction Mechanism of Zeolite Synthesis from Coal Fly Ash.

Coal fly ash was modified to zeolitic materials by hydrothermal treatment at 90 ?C. The zeolite synthesis was studied as a function of the mole ratio of Na2O/SiO2 in the reaction mixtures. The results showed that NaP1 zeolite is obtained when the Na2O/SiO2 mole ratio was 0.7. Hydroxysodalite is the dominant zeolite phase in modified fly ash treated with a higher Na2O concentration solution (Na2O/SiO2 = 1.3). The IR and XRD methods were used to determine the phases present in the starting sample and in the zeolitic materials.

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Zeolite synthesis from coal fly ash for the removal of lead ions from aqueous solution

Journal of Chemical Technology & Biotechnology ◽

10.1002/jctb.521 ◽

2001 ◽

Vol 77 (1) ◽

pp. 63-69 ◽

Cited By ~ 51

Author(s):

Jason Scott ◽

Deyan Guang ◽

Kornrat Naeramitmarnsuk ◽

Mallika Thabuot ◽

Rose Amal

Keyword(s):

Aqueous Solution ◽

Fly Ash ◽

Coal Fly Ash ◽

Lead Ions ◽

Zeolite Synthesis

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Removal of Heavy Metal from Wastewater Using Zeolite from Fly Ash

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.2736 ◽

2012 ◽

Vol 518-523 ◽

pp. 2736-2739 ◽

Cited By ~ 4

Author(s):

Chang Nian Wu ◽

Yu Chao Tang ◽

Li Hua Tang

Keyword(s):

Heavy Metal ◽

Fly Ash ◽

Heavy Metal Ions ◽

Coal Fly Ash ◽

Freundlich Isotherm ◽

Zeolite Synthesis ◽

Pseudo Second Order ◽

Xrd Patterns ◽

Isotherm Equations ◽

Modified Forms

Coal fly ash (CFA) was modified by hydrothermal treatment using NaOH solutions for zeolite synthesis. The XRD patterns of zeolite and coal fly ash are presented. The synthesized zeolite was investigated for adsorption of heavy metal ions in aqueous solution. It was shown that fly ash and the modified forms could effectively absorb heavy metals. The adsorption isotherm could be described by Freundlich isotherm equations. The pseudo second-order kinetics would be better for fitting the dynamic adsorption of Cu2+ and Cd2+.

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Synthesis of Zeolite A from Mongolian Coal Fly Ash by Hydrothermal Treatment

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.271.1 ◽

2018 ◽

Vol 271 ◽

pp. 1-8 ◽

Cited By ~ 4

Author(s):

Ulambayar Rentsenorov ◽

Batmunkh Davaabal ◽

Jadambaa Temuujin

Keyword(s):

Fly Ash ◽

Hydrothermal Treatment ◽

Cation Exchange Capacity ◽

Coal Fly Ash ◽

Batch Composition ◽

Exchange Capacity ◽

Zeolite Synthesis ◽

Zeolite A ◽

Acid Pretreatment ◽

Type Zeolite

Raw coal fly ash and acid pretreated fly ash were used to synthesize A-type zeolite by hydrothermal treatment. In order to synthesize zeolite A an aqueous gel having a molar batch composition of Na2O:Al2O3:1.926SiO2:128H2O was utilized. Fly ash and zeolitic products were characterized by SEM, XRF, XRD and cation exchange capacity (CEC). After hydrothermal treatment, several types of zeolites were formed: zeolite A, analcime, faujasite and hydroxy-sodalite. The highest content of zeolite A was formed in the mixture treated at 80°C for 8 hours. CEC values of the zeolitic products were 28-38 times higher than that of in raw fly ash. Acid pretreatment which leads to low calcium and iron content is preferable method for processing of fly ash for the zeolite synthesis. Synthesized zeolite can be used for ion exchangers for water treatment.

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