Kinetic and Thermodynamic Studies on the Adsorption of Reactive Red 239 by Carra Sawdust Treated with Formaldehyde

Author(s)

Sanchez, Nedher ^{[1, 2]} ; Benedetti, Tania M. ^[1] ; Vazquez, Mario ^[2] ; Cordoba de Torresi, Susana I. ^[1] ; Torresi, Roberto M. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05513970 Sao Paulo - Brazil

^[2] Univ Antioquia, Fac Ciencias Exactas & Nat, Inst Quim, Medellin 1226 - Colombia

• Document type: Journal article
• Source: ADSORPTION SCIENCE & TECHNOLOGY; v. 30, n. 10, p. 881-899, DEC 2012.
• Web of Science Citations: 7

Abstract

In this study, carra sawdust pre-treated with formaldehyde was used to adsorb reactive red 239 (RR239). The effects of several experimental conditions, including the concentration of dye, sorbent dosage, temperature, ionic strength, stirring speed and solution pH, on the kinetics of the adsorption process have been studied, and the experimental data were fitted to pseudo-second-order model. A study of the intra-particle diffusion model indicates that the mechanism of dye adsorption using carra sawdust is rather complex and is most likely a combination of external mass transfer and intra-particle diffusion. The experimental data obtained at equilibrium were analyzed using the Langmuir and Freundlich isotherm models, and the results indicated that at this concentration range, both models can be applied for obtaining the equilibrium parameters. The maximum dye uptake obtained at 298 K was found to be 15.1 mg g(-1). In contrast to the usual systems, the reactive dye studied in the present work is strongly attached to the sawdust even after several washes with water, allowing it to be discarded as a solid waste. (AU)

• FAPESP's process: 09/53199-3 - Molecular recognition and energy storage: fundamental studies concerning geometry, size and synthesis effects on the optimization of the chemical properties of electroactive materials
• Grantee: Roberto Manuel Torresi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 12/02117-0 - Poly(ionic liquids) in electrochemical devices: polyelectrolytes for energy storage and conversion devices and stabilization of graphene and poly(3,4-etylenedioxidethiophene) (PEDOT) for electroactive films obtention
• Grantee: Tania Machado Benedetti
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 08/57805-2 - Institute of Bioanalytics
• Grantee: Lauro Tatsuo Kubota
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 10/08646-9 - Synthesis and characterization of ionic liquids based in phosphonium quaternary cations
• Grantee: Nédher Sánches Ramírez
• Support Opportunities: Scholarships in Brazil - Doctorate