Kinetic and calorimetric study of the adsorption of dyes on mesoporous activated carbon prepared from coconut coir dust

Published Date
15 June 2006, Vol.298(2):515–522, doi:10.1016/j.jcis.2006.01.021

Author 

Jeremiad de Souza Macedo

Nivan Bezerra da Costa Júnior

Luis Eduardo Almeida

Eunice Fragoso da Silva Vieira

Antonio Reinaldo Cestari

Iara de Fátima Gimenez

Neftali Lênin Villarreal Carreño

Ledjane Silva Barreto ^,

• Laboratório de Síntese e Aplicação de Materiais, Departamento de Química—CCET, Universidade Federal de Sergipe, 49000-100 São Cristovão, Sergipe, Brazil

Received 17 October 2005. Accepted 14 January 2006. Available online 23 February 2006.

Abstract

Mesoporous activated carbon has been prepared from coconut coir dust as support for adsorption of some model dye molecules from aqueous solutions. The methylene blue (MB) and remazol yellow (RY) molecules were chosen for study of the adsorption capacity of cationic and anionic dyes onto prepared activated carbon. The adsorption kinetics was studied with the Lagergren first- and pseudo-second-order kinetic models as well as the intraparticle diffusion model. The results for both dyes suggested a multimechanism sorption process. The adsorption mechanisms in the systems dyes/AC follow pseudo-second-order kinetics with a significant contribution of intraparticle diffusion. The samples simultaneously present acidic and basic sites able to act as anchoring sites for basic and acidic dyes, respectively. Calorimetric studies reveal that dyes/AC interaction forces are correlated with the pH of the solution, which can be related to the charge distribution on the AC surface. These AC samples also exhibited very short equilibrium times for the adsorption of both dyes, which is an economically favorable requisite for the activated carbon described in this work, in addition to the local abundance of the raw material.

Graphical abstract

Kinetic and calorimetric studies of MB and RY adsorption onto activated carbon prepared from waste material showed that the process follows a pseudo-second-order kinetics with contribution of intraparticle diffusion.

Keywords

• Activated carbon
• Coir dust
• Porosity
• Adsorption kinetics
• Heat of adsorption

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