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Adsorption of Cr(III) from aqueous media on zeolite A prepared from fused fly ash by hydrothermal synthesis

Ulambayar Rentsennorov|Batmunkh Davaabal|Bayaraa Dovchin|Jadambaa Temuujin
청정에너지연구소 (Clean-Energy Research Institute)|2021.04|Journal of Ceramic Processing Research|제22권 제2호|pp. 232-239|DOI 10.36410/jcpr.2021.22.2.232

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참고문헌

키워드

Hydrothermal synthesisFly ashAcid leachingZeolite ACr (III) removal
주제분류재료공학

초록

In this work, the potential application of using zeolite A synthesized from fly ash to remove Cr (III) from aqueous solutionswas studied. Zeolite A was synthesized from acid-washed fly ash by alkali fusion followed by hydrothermal treatment. The acidwashing removed Ca and Fe from the fly ash, which allowed synthesis of the required zeolite. The acid-washed fly ash andNaOH were mixed at a mass ratio of 1:1.2 and heated at various temperatures. The hydrothermal zeolite synthesis was carriedout at 600 oC temperature and the product characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy(SEM). The zeolite achieved maximum adsorption capacity of Cr (III) attaining equilibrium within 30 min at pH 4.0. Theadsorption isotherm for Cr (III) on this zeolite A was tested and showed that the adsorption data of Cr (III) were fitted bestby a Langmuir isotherm.

Abstract

In this work, the potential application of using zeolite A synthesized from fly ash to remove Cr (III) from aqueous solutionswas studied. Zeolite A was synthesized from acid-washed fly ash by alkali fusion followed by hydrothermal treatment. The acidwashing removed Ca and Fe from the fly ash, which allowed synthesis of the required zeolite. The acid-washed fly ash andNaOH were mixed at a mass ratio of 1:1.2 and heated at various temperatures. The hydrothermal zeolite synthesis was carriedout at 600 oC temperature and the product characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy(SEM). The zeolite achieved maximum adsorption capacity of Cr (III) attaining equilibrium within 30 min at pH 4.0. Theadsorption isotherm for Cr (III) on this zeolite A was tested and showed that the adsorption data of Cr (III) were fitted bestby a Langmuir isotherm.

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