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Removal of Acid Green 68:1 from aqueous solutions by calcined and uncalcined layered double hydroxides.
- Source :
-
Applied Clay Science . Aug2013, Vol. 80-81, p189-195. 7p. - Publication Year :
- 2013
-
Abstract
- Abstract: Magnesium aluminum layered double hydroxide (LDH) was synthesized by the co-precipitation method followed by calcination. The resulting materials were characterized by X-ray diffraction (PXRD) and attenuated total reflectance with Fourier transform infrared spectroscopy (FTIR/ATR) and simultaneous thermogravimetric analysis/differential scanning calorimetry coupled to mass spectrometry (TGA–DSC–MS). Calcined and non-calcined LDHs were used as adsorbents to remove azo dye Acid Green 68:1 in an aqueous solution. Adsorption experiment results indicated that calcined LDH possesses greater adsorption capacity (154.8mgg−1) than non-calcined LDH (99.1mgg−1). Isotherms showed that adsorption of the dye was more consistent with the Langmuir model. Kinetic experiments of calcined LDH adsorption showed that for low concentration (50, 100 and 200mgL−1), the system reached the adsorption equilibrium in 1, 2, and 4h, and for higher concentration after 10h. The best kinetic model was the pseudo-second order. Adsorption studies also showed that the capacity for adsorption of the dye by calcinated LDH does not significantly diminish with pH level variation. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 01691317
- Volume :
- 80-81
- Database :
- Academic Search Index
- Journal :
- Applied Clay Science
- Publication Type :
- Academic Journal
- Accession number :
- 90103012
- Full Text :
- https://doi.org/10.1016/j.clay.2013.04.006