Effective transport properties for the pyridine-granular activated carbon adsorption system

In this work, the kinetics of pyridine adsorption onto granular activated carbon was studied from the point of view of an up-scaling process by using the method of volume averaging. The pore and surface effective diffusivities were estimated by supposing simple microscale geometries (ordered media of cylinders and spheres) and those of images processed from SEM (Scanning Electron Microscopy) micrographs. In addition, as a rough estimate, the point surface diffusivity is reported. The results revealed that the up-scaled diffusional model satisfactorily interpreted the concentration decay curves and the effective diffusivity was found to be an increasing function of the concentration, mainly due to the contribution of surface diffusion. In general, the diffusivity coefficients involved in the adsorption system are related through the expression molecular diffusivity = 22 i‚' point surface diffusivity = 5/2 x‚' pore effective diffusivity = 1/12 x ‚' surface effective diffusivity.

[1]  Jose Alvarez-Ramirez,et al.  On diffusion, dispersion and reaction in porous media , 2011 .

[2]  J. Rivera-Utrilla,et al.  Modeling adsorption rate of pyridine onto granular activated carbon , 2010 .

[3]  J. Álvarez-Ramírez,et al.  On the effective diffusivity under chemical reaction in porous media , 2010 .

[4]  Jian-long Wang,et al.  Microbial degradation of pyridine by Paracoccus sp. isolated from contaminated soil. , 2010, Journal of hazardous materials.

[5]  Jun Ma,et al.  Adsorption of bisphenol A from aqueous solution onto activated carbons with different modification treatments. , 2009, Journal of hazardous materials.

[6]  Jose Alvarez-Ramirez,et al.  Jump Condition for Diffusive and Convective Mass Transfer Between a Porous Medium and a Fluid Involving Adsorption and Chemical Reaction , 2009 .

[7]  Yan-Xing Wang,et al.  Removal of dissolved organic matter and phthalic acid esters from landfill leachate through a complexation-flocculation process. , 2009, Waste management.

[8]  P. Roy,et al.  Biodegradation of pyridine by the new bacterial isolates S. putrefaciens and B. sphaericus. , 2008, Journal of hazardous materials.

[9]  I. D. Mall,et al.  Pyridine sorption from aqueous solution by rice husk ash (RHA) and granular activated carbon (GAC): parametric, kinetic, equilibrium and thermodynamic aspects. , 2008, Journal of hazardous materials.

[10]  Selene M.A. Guelli U. de Souza,et al.  Modelling of the dyeing process of packed cotton threads using reactive dyes , 2007 .

[11]  Dilênio Pacheco de Souza,et al.  Prediction of effective diffusivity tensors for bulk diffusion with chemical reactions in porous media , 2007 .

[12]  A. Ahmadi,et al.  Macroscopic thermal properties of real fibrous materials: Volume averaging method and 3D image analysis , 2006 .

[13]  D. Mohan,et al.  Removal of pyridine from aqueous solution using low cost activated carbons derived from agricultural waste materials , 2004 .

[14]  E. Sabah,et al.  Interaction of pyridine derivatives with sepiolite. , 2002, Journal of colloid and interface science.

[15]  S. Whitaker.  The method of volume averaging , 1998 .

[16]  H. T. Chang,et al.  Intraparticle Mass Transport Mechanism in Activated Carbon Adsorption of Phenols , 1996 .

[17]  F. Carrasco-Marín,et al.  Adsorption of some substituted phenols on activated carbons from a bituminous coal , 1995 .

[18]  C. Geankoplis,et al.  Diffusion in liquid‐filled pores of activated carbon. I. Pore volume diffusion , 1994 .

[19]  S. Whitaker,et al.  Bulk and surface diffusion in porous media: An application of the surface-averaging theorem , 1993 .

[20]  R. Andreozzi,et al.  Ozonation of pyridine in aqueous solution: Mechanistic and kinetic aspects , 1991 .

[21]  John C. Slattery,et al.  Interfacial Transport Phenomena , 1990 .

[22]  Stephen Whitaker,et al.  Heat conduction in multiphase systems—I: Theory and experiment for two-phase systems , 1985 .

[23]  Hsueh-Chia Chang,et al.  Effective diffusion and conduction in two‐phase media: A unified approach , 1983 .

[24]  Motoyuki Suzuki,et al.  Concentration dependence of surface diffusion coefficient of propionic acid in activated carbon particles , 1982 .

[25]  J. Currie,et al.  Gaseous diffusion in porous media Part 1. - A non-steady state method , 1960 .