Abstract
Comparisons of protocatechuic acid (PA) and caffeic acid (CA) adsorption isotherm on C18 column and competitive adsorption of the two compounds were investigated. By linear and nonlinear regression analysis, the experimental parameters in the equilibrium isotherms were estimated. Adsorption equilibrium data of the two compounds were investigated using six different models including linear, Langmuir, Freundlich, Langmuir-Freundlich, competitive Langmuir and Quadratic. In the moderate range of concentrations, the competitive Langmuir isotherm proved to be the best model for these experimental data. The regression coefficients of the competitive Langmuir adsorption isotherms were 0.9860 for PA and 0.9898 for CA, respectively. The coefficients obtained for the six isotherm models confirmed the superiority of the competitive Langmuir isotherm for analyzing the competitive adsorption data of solutes.
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Yoon, C.H., Zhu, T. & Row, K.H. Competitive adsorption of protocatechuic acid and caffeic acid on C18 particles. Korean J. Chem. Eng. 29, 135–138 (2012). https://doi.org/10.1007/s11814-011-0152-z
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DOI: https://doi.org/10.1007/s11814-011-0152-z