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Adsorption kinetics of malachite green onto activated carbon prepared from Tunçbilek lignite.
J Hazard Mater. 2006 Feb 06; 128(2-3):150-7.JH

Abstract

Adsorbent (T3K618) has been prepared from Tunçbilek lignite by chemical activation with KOH. Pore properties of the activated carbon such as BET surface area, pore volume, pore size distribution, and pore diameter were characterized by t-plot based on N2 adsorption isotherm. The N2 adsorption isotherm of malachite green on T3K618 is type I. The BET surface area of the adsorbent which was primarily contributed by micropores was determined 1000 m2/g. T3K618 was used to adsorb malachite green (MG) from an aqueous solution in a batch reactor. The effects of initial dye concentration, agitation time, initial pH and adsorption temperature have been studied. It was also found that the adsorption isotherm followed both Freundlich and Dubinin-Radushkevich models. However, the Freundlich gave a better fit to all adsorption isotherms than the Dubinin-Radushkevich. The kinetics of adsorption of MG has been tested using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. Results show that the adsorption of MG from aqueous solution onto micropores T3K618 proceeds according to the pseudo-second-order model. The intraparticle diffusion of MG molecules within the carbon particles was identified to be the rate-limiting step. The adsorption of the MG was endothermic (DeltaH degrees = 6.55-62.37 kJ/mol) and was accompanied by an increase in entropy (DeltaS degrees = 74-223 J/mol K) and a decrease in mean value of Gibbs energy (DeltaG degrees = -6.48 to -10.32 kJ/mol) in the temperature range of 20-50 degrees C.

Authors+Show Affiliations

Inonu University, Faculty of Engineering, Department of Chemical Engineering, 44280 Malatya, Turkey. yonal@inonu.edu.trNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16154262

Citation

Onal, Y, et al. "Adsorption Kinetics of Malachite Green Onto Activated Carbon Prepared From Tunçbilek Lignite." Journal of Hazardous Materials, vol. 128, no. 2-3, 2006, pp. 150-7.
Onal Y, Akmil-Başar C, Eren D, et al. Adsorption kinetics of malachite green onto activated carbon prepared from Tunçbilek lignite. J Hazard Mater. 2006;128(2-3):150-7.
Onal, Y., Akmil-Başar, C., Eren, D., Sarici-Ozdemir, C., & Depci, T. (2006). Adsorption kinetics of malachite green onto activated carbon prepared from Tunçbilek lignite. Journal of Hazardous Materials, 128(2-3), 150-7.
Onal Y, et al. Adsorption Kinetics of Malachite Green Onto Activated Carbon Prepared From Tunçbilek Lignite. J Hazard Mater. 2006 Feb 6;128(2-3):150-7. PubMed PMID: 16154262.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Adsorption kinetics of malachite green onto activated carbon prepared from Tunçbilek lignite. AU - Onal,Y, AU - Akmil-Başar,C, AU - Eren,Didem, AU - Sarici-Ozdemir,Cigdem, AU - Depci,Tolga, Y1 - 2005/09/08/ PY - 2005/04/19/received PY - 2005/07/11/revised PY - 2005/07/29/accepted PY - 2005/9/13/pubmed PY - 2006/12/9/medline PY - 2005/9/13/entrez SP - 150 EP - 7 JF - Journal of hazardous materials JO - J Hazard Mater VL - 128 IS - 2-3 N2 - Adsorbent (T3K618) has been prepared from Tunçbilek lignite by chemical activation with KOH. Pore properties of the activated carbon such as BET surface area, pore volume, pore size distribution, and pore diameter were characterized by t-plot based on N2 adsorption isotherm. The N2 adsorption isotherm of malachite green on T3K618 is type I. The BET surface area of the adsorbent which was primarily contributed by micropores was determined 1000 m2/g. T3K618 was used to adsorb malachite green (MG) from an aqueous solution in a batch reactor. The effects of initial dye concentration, agitation time, initial pH and adsorption temperature have been studied. It was also found that the adsorption isotherm followed both Freundlich and Dubinin-Radushkevich models. However, the Freundlich gave a better fit to all adsorption isotherms than the Dubinin-Radushkevich. The kinetics of adsorption of MG has been tested using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. Results show that the adsorption of MG from aqueous solution onto micropores T3K618 proceeds according to the pseudo-second-order model. The intraparticle diffusion of MG molecules within the carbon particles was identified to be the rate-limiting step. The adsorption of the MG was endothermic (DeltaH degrees = 6.55-62.37 kJ/mol) and was accompanied by an increase in entropy (DeltaS degrees = 74-223 J/mol K) and a decrease in mean value of Gibbs energy (DeltaG degrees = -6.48 to -10.32 kJ/mol) in the temperature range of 20-50 degrees C. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/16154262/Adsorption_kinetics_of_malachite_green_onto_activated_carbon_prepared_from_Tunçbilek_lignite_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(05)00453-X DB - PRIME DP - Unbound Medicine ER -