Adsorption and desorption studies on hazardous dye Naphthol Yellow S.

Autor: Jain R; Department of Environmental Chemistry, Jiwaji University Gwalior, Gwalior 474011, India. rajeevjain54@yahoo.co.in, Gupta VK, Sikarwar S
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2010 Oct 15; Vol. 182 (1-3), pp. 749-56. Date of Electronic Publication: 2010 Jun 30.
DOI: 10.1016/j.jhazmat.2010.06.098
Abstrakt: In the present study, the batch technique was adopted under a variety of conditions, viz., amount of adsorbent, contact time, concentration, temperature and pH. By using UV spectrophotometer, concentration of dye was measured before and after adsorption. Dye removal data were fitted into the Langmuir and Freundlich adsorption isotherm equations. The values of their corresponding constants were determined. Thermodynamic parameters like free energy (DeltaG), enthalpy (DeltaH) and entropy (DeltaS) of the systems were calculated by using Langmuir constant. The estimated values for (DeltaG) were -8.027x10(3) and -28.46x10(3) kJ mol(-1) over activated carbon and activated de-oiled mustard at 303 K (30 degrees C), indicate toward a spontaneous process. The adsorption process followed pseudo-first-order model. The values of % removal and k(ad) for dye systems were calculated at different temperatures ranging (303-323 K). Desorption studies indicate that elution by dilute NaOH through the fixed bed of the adsorbents columns could be regenerated and a quantitative recovery of Naphthol Yellow S can be achieved.
(2010 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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