Details

Autor(en) / Beteiligte

• Lin, J.X.
• Zhan, S.L.
• Fang, M.H.
• Qian, X.Q.
• Yang, H.

Titel

Adsorption of basic dye from aqueous solution onto fly ash

Ist Teil von

• Journal of environmental management, 2008-04, Vol.87 (1), p.193-200

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2008

Quelle

MEDLINE

Beschreibungen/Notizen

• The fly ash treated by H 2SO 4 was used as a low-cost adsorbent for the removal of a typical dye, methylene blue, from aqueous solution. An increase in the specific surface area and dye-adsorption capacity was observed after the acid treatment. The adsorption isotherm and kinetics of the treated fly ash were studied. The experimental results were fitted using Langmuir and Freundlich isotherms. It shows that the Freundlich isotherm is better in describing the adsorption process. Two kinetic models, pseudo-first order and pseudo-second order, were employed to analyze the kinetic data. It was found that the pseudo-second-order model is the better choice to describe the adsorption behavior. The thermodynamic study reveals that the enthalpy (Δ H 0) value is positive (5.63 kJ/mol), suggesting an endothermic nature of the adsorption.