Numerical prediction of diffusion and electric field-induced iron nanoparticle transport

Abstract

Numerical prediction of diffusion and electric field-induced iron nanoparticle transport, Electrochimica Acta http://dx.doi.org/10.1016/j.electacta. 2014.11.157 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Electrokinetics and Zero Valent Iron Nanoparticles: Experimental and Modeling of the Transport in Different Porous Media

“…In the special case that the reaction is at equilibrium, the reaction quotient is equal to the equilibrium constant at 25 C (Gomes et al 2015). υ in this case is the stoichiometric coefficient of the electrons in the redox equation, i.e., the number of electrons exchanged during the oxidation or reaction process.…”

“…where R is the ideal gas constant, F is the Faraday constant, z i is the ionic charge of the species, and T is the temperature (K ), assuming a constant room temperature of 25 C (Gomes et al 2015). The value of the electroosmotic permeability usually is in a very tight range of 10 À5 to 10 À4 cm 2 s À1 V À1 (Mitchell 1993).…”

“…This generalized physicochemical model has been developed to describe the electrically induced transport of nZVI particles through different types of media with varying porosity and surface reactivity (Gomes et al 2015). The model is more detailed, including the fundamental (Gomes et al , 2014b.…”

“…The mass balance equations for nZVI and the ionic species are integrated over the one-dimensional region limited by the electrodes compartments to obtain the concentration profile for a given set of experimental conditions (Gomes et al 2015). Due to the negative charge of polyacrylic acid-coated nZVI, the sign of electrophoretic term is negative, whereas the electroosmotic term is positive, resulting in a reduced effective mobility.…”

“…With respect to the chemical reactions, only the chemical equilibria and the electrochemical reactions at the electrodes are considered (Gomes et al 2015).…”