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DOI: https://doi.org/10.4491/eer.2019.205
Adsorption of fluoride by porous adsorbents: Estimating pore diffusion coefficients from batch kinetic data
Gang Yuan1, Bin Zhao2, and Khim Hoong Chu3
1Suzhou Industrial Park Sino French Environmental Technology, Suzhou 215125, People’s Republic of China
2Dellsen Education & Technology, Montreal, Quebec, Canada H4C 0B8
3Honeychem, Nanjing Chemical Industry Park, Nanjing 210047, People’s Republic of China
Corresponding Author: Khim Hoong Chu ,Tel: +86-25-58397899, Fax: +86-25-58397899, Email: khimchu@gmail.com
Received: May 13, 2019;  Accepted: August 31, 2019.
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ABSTRACT
A simple method is presented for extracting pore diffusion coefficients from batch adsorption kinetic data. The method employs the classic Langmuir kinetics model which is characterized by a single rate coefficient. An analytical solution in the form of a simple algebraic equation is available for this rate model. Fitting the algebraic equation to batch kinetic data to determine the rate coefficient is straightforward and can be conveniently accomplished using standard spreadsheet programs. The resultant rate coefficient can be converted to the pertinent pore diffusion coefficient via a separate algebraic expression. The proposed modeling approach provides accurate fits of experimental kinetic data taken from the literature and yields acceptable errors in the best estimates for pore diffusion coefficients. Specific examples discussed are the adsorption of fluoride by bone char and laterite adsorbents.
Keywords: Adsorption | Fluoride | Langmuir kinetics | Parameter estimation | Pore diffusion
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