TY - JOUR

T1 - Critical Review and Discussion of the Nonlinear Form of Radke-Prausnitz Model in Adsorption Solid-Liquid Phases

AU - Tran, Hai Nguyen

AU - Bollinger, Jean Claude

AU - Salvestrini, Stefano

AU - Chu, Khim Hoong

AU - Juang, Ruey Shin

N1 - Publisher Copyright:
© 2022 American Society of Civil Engineers.

PY - 2023/3/1

Y1 - 2023/3/1

N2 - The Radke-Prausnitz model, a typical three-parameter model belonging to the Langmuir-Freundlich-type equation, is increasingly being used to correlate the equilibrium data of various adsorption processes. However, very few published works provide the correct information on (1) the nonlinear form of this model, (2) the units of its parameters, and (3) its original citation. This work provides a critical analysis of the Radke-Prausnitz model with special emphasis on promoting its proper application in adsorption research. The correct expression and citation of the models used in adsorption studies are provided. The correct units of its parameters aRP, bRP, and β are L/kg, (mol/kg)/(mol/L)β, and unitless when the solution phase concentration Ce is given in mol/L and the adsorbed phase concentration qe is defined in mol/kg. The Radke-Prausnitz model can be reduced to the Henry, Freundlich, Langmuir, or Redlich-Peterson model in some special cases. The Radke - Prausnitz model is valid when the exponent β is in the range of 0≤β≤1. A new adsorption equilibrium constant of this model is introduced. The feasibility of using the new equilibrium constant to calculate the thermodynamic parameters (ΔG°, ΔH°, and ΔS°) of adsorption processes is discussed herein.

AB - The Radke-Prausnitz model, a typical three-parameter model belonging to the Langmuir-Freundlich-type equation, is increasingly being used to correlate the equilibrium data of various adsorption processes. However, very few published works provide the correct information on (1) the nonlinear form of this model, (2) the units of its parameters, and (3) its original citation. This work provides a critical analysis of the Radke-Prausnitz model with special emphasis on promoting its proper application in adsorption research. The correct expression and citation of the models used in adsorption studies are provided. The correct units of its parameters aRP, bRP, and β are L/kg, (mol/kg)/(mol/L)β, and unitless when the solution phase concentration Ce is given in mol/L and the adsorbed phase concentration qe is defined in mol/kg. The Radke-Prausnitz model can be reduced to the Henry, Freundlich, Langmuir, or Redlich-Peterson model in some special cases. The Radke - Prausnitz model is valid when the exponent β is in the range of 0≤β≤1. A new adsorption equilibrium constant of this model is introduced. The feasibility of using the new equilibrium constant to calculate the thermodynamic parameters (ΔG°, ΔH°, and ΔS°) of adsorption processes is discussed herein.

KW - Adsorption isotherm

KW - Citation

KW - Radke-Prausnitz model

KW - Thermodynamic parameter

UR - http://www.scopus.com/inward/record.url?scp=85141540870&partnerID=8YFLogxK

U2 - 10.1061/JOEEDU.EEENG-7074

DO - 10.1061/JOEEDU.EEENG-7074

M3 - 文献综述

AN - SCOPUS:85141540870

SN - 0733-9372

VL - 149

JO - Journal of Environmental Engineering

JF - Journal of Environmental Engineering

IS - 3

M1 - 03122006

ER -