Study of Methylene Blue Dye Adsorption on to Activated Carbons from Olive Stones

Activated carbons were produced from olive stones by a chemical process. The activated carbon (AC) were modified by nitric acid and used as adsorbents for the removal of methylene blue dye from aqueous solution. The activated carbons were characterized by nitrogen adsorption and enthalpy of immersion. Batch adsorption experiments were carried out to study the effect of initial different concentrations solution on dye adsorption properties. Isotherms were fitted to Langmuir model, and corresponding parameters were determined. The results showed that the increase of ration of ZnCl₂ leads to increase in apparent surface areas and produces activated carbons with pore structure more developed. However, the maximum MB uptakes for all carbons were determined and correlated with activated carbons characteristics. 

• L. Temdrara
• A. Khelifi
• A. Addoun

• Adsorption
• activated carbon
• chemical activation
• enthalpy of immersion.

[1] Srivastava S, Sinha R, Roy D. Toxicological effects of Malachite Green.
Aquatic Toxicol 2004; 66: 319-29.
[2] Garg VK, Amita M, Kumar R, Gupta R. Basic dye (methylene blue)
removal from simulated wastewater by adsorption using Indian
Rosewood sawdust: a timber industry waste. Dyes Pigments 2004;
63(3): 243-50.
[3] S. Brunauer, P.H. Emmett, E. Teller, Adsorption of Gases in
Multimolecular Layers, J. Am. Chem. Soc. 60(2) (1938) 309–319.
[4] M.M. Dubinin, Progress in Surface and Membrane Science, Academic
Press London 9, J. W. Patrick, (1975).
[5] R. Denoyel, J. Fernandez-Colina, Y. Grillet, J. Rouquerol, Assessment
of the surface area and microporosity of activated charcoals from
immersion calorimetry and nitrogen adsorption data, Langmuir 9 (1993)
515–518.
[6] J. Silvestre-Albero, C. Gómez de Salazar, A. Sepúlveda Escribano, F.
Rodríguez-Reinoso, Characterization of microporous solids by
immersion calorimetry, Colloids and Surfaces A: Physicochem. Eng.
Aspects (2001) 187–188:151–165.
[7] I. Langmuir, The adsorption of gases on plane surfaces of glass, mica
and platinum, J. Am. Chem. 57 (1918) 1361–1403.
[8] K.S.W. Sing, D.H. Everett, R.A.W. Haul, L. Moscou, R.A. Pierotti, J.
Rouquerol, T. Siemieniewska, Reporting Physisorption Data for
Gas/Solid Systems with Special Reference to the Determination of
Surface Area and Porosity, Pure Appl. Chem. 57 (1985) 603–619.