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Kinetics of the Reaction Between Orthophosphate Ions and Muskegon Dune Sand¹

ABSTRACT

This paper presents data on the kinetics of orthophosphate adsorption on Muskegon dune sand. The data was obtained using batch experiments with shaken flasks followed by centrifuging and standard techniques for orthophosphate determination. Data is also presented for orthophosphate breakthrough from packed columns of dune sand.

Three mechanistic kinetic models were evaluated against the batch adsorption data over the 0- to 24-hour period: (i) LPDF model for interparticle mass transfer followed by a first order irreversible surface reaction; (ii) Langmuir kinetics followed by a first order irreversible surface reaction; and (iii) solid phase diffusion model for intraparticle mass transfer. Both models (i) and (ii) describe the fast and flow reactions occurring over the 24 hours studied. Model (ii) is favored partly because the sum of the square error in model (i) is 41% greater than the same for model (ii). Model (iii) does not describe the adsorption data during the 24-hour period studied.

Based on dune sand chemical composition data, and the length of the fast reaction period, it appears that the major reaction occurring during orthophosphate adsorption may involve calcite. Model (ii) is shown to be consistent with the general theory of orthophosphate calcite adsorption proposed by W. Stumm and J. O. Leckie (1970).

Key Words: kinetic models • reaction mechanisms • shaken flasks • soil columns • breakthrough curves

¹ Contribution from the Dep. of Chemical Engineering, Cleveland State Univ., Cleveland, OH 44115. Research supported by NSF Grant ENG76-09272.

² Associate Professor of Chemical Engineering, and Research Assistant, respectively, Cleveland State Univ., Cleveland, OH 44115. F. J. Petschauer is currently Chemical Engineer, Norton Co., Akron, Ohio.

Received for publication September 1, 1978.