Pore-Surface Diffusion Model for Batch Adsorption Processes

Langmuir ◽  
2003 ◽  
Vol 19 (10) ◽  
pp. 4188-4196 ◽  
Author(s):  
Chi-Wai Hui ◽  
Buning Chen ◽  
Gordon McKay
Keyword(s):  
Surface Diffusion ◽  
Diffusion Model ◽  
Batch Adsorption ◽  
Pore Surface ◽  
Adsorption Processes

The pore surface diffusion model as a tool for rapid screening of novel nanomaterial-enhanced hybrid ion-exchange media

2015 ◽  
Vol 1 (4) ◽  
pp. 448-456 ◽  
Author(s):  
Grigoria Athanasaki ◽  
Laurie Sherrill ◽  
Kiril D. Hristovski
Keyword(s):  
Ion Exchange ◽  
Surface Diffusion ◽  
Diffusion Model ◽  
Screening Tool ◽  
Breakthrough Curves ◽  
Rapid Screening ◽  
Pore Surface

The primary goal of this study was to examine the feasibility of using Pore Surface Diffusion Model (PSDM) as a rapid screening tool to predict breakthrough curves of short bed columns packed with nanomaterial enhanced hybrid-ion exchange media.

scholarly journals Homogeneous Surface Diffusion Model for the Adsorption of Basic Dyestuffs onto Natural Clay in Batch Adsorbers

1991 ◽  
Vol 8 (4) ◽  
pp. 217-225 ◽  
Author(s):  
Mohammad S. El-Geundi
Keyword(s):  
Mass Transfer ◽  
Surface Diffusion ◽  
Diffusion Model ◽  
Batch Adsorption ◽  
External Mass Transfer ◽  
Natural Clay ◽  
Homogeneous Surface ◽  
Concentration Time ◽  
Ks Values ◽  
Best Fit

The adsorption of basic dyestuffs (Basic Blue 69 and Basic Red 22) onto natural clay has been studied using a series of batch adsorption runs. The homogeneous surface diffusion model (HSDM) has been developed based on external mass transfer and surface diffusion to explain the concentration–time curves. A computer program has been used to generate theoretical concentration–time curves and these results have been adjusted to the experimental data by means of a ‘best fit’ approach. The HSDM has been successfully used to model the dynamics of the adsorption process for basic dyestuffs onto natural clay. The model predicts a single external mass-transfer coefficient, Ks, and a single surface diffusion coefficient, Ds, with initial dye concentration or natural clay mass. The Ks values are 3.4×10–3 and 2.6×10–3 cm/s for Basic Blue 69 and Basic Red 22, respectively. The Ds values are 2.3×10–8 and 1.9×10–8 cm2/s for Basic Blue 69 and Basic Red 22, respectively.

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