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

다국어 초록 (Multilingual 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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