Elucidation of adsorption mechanisms and mass transfer controlling resistances during single and binary adsorption of caffeic and chlorogenic acids

2021 ◽  
Author(s):  
Eyden S. Hernández-Padilla ◽  
Ana I. Zárate-Guzmán ◽  
Omar González-Ortega ◽  
Erika Padilla-Ortega ◽  
Azael Gómez-Durán ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Chlorogenic Acids ◽  
Binary Adsorption ◽  
Adsorption Mechanisms

scholarly journals Elucidation of Adsorption Mechanisms And Mass Transfer Controlling Resistances During Single And Binary Adsorption of Caffeic And Chlorogenic Acids

2021 ◽  
Author(s):  
Eyden S. Hernández-Padilla ◽  
Ana I. Zárate-Guzmán ◽  
Omar González-Ortega ◽  
Erika Padilla-Ortega ◽  
Azael Gómez-Durán ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Chlorogenic Acid ◽  
Electrostatic Interactions ◽  
Adsorption Equilibrium ◽  
Order Kinetic ◽  
Chlorogenic Acids ◽  
Binary Adsorption ◽  
Experimental Adsorption ◽  
Adsorption Mechanisms

Abstract In this work, the potential of activated carbon to remove caffeic and chlorogenic acids was investigated. The study focused on evaluating the single and binary adsorption equilibrium, as well as investigating the mass transfer resistances present during the process by applying kinetic and diffusional models for a future scale-up of the process. For both compounds, the single adsorption equilibrium was studied at pH values of 3, 5, and 7. The experimental adsorption isotherms were interpreted using the Langmuir and Freundlich models, obtaining maximum adsorption capacities of 1.33 and 1.62 mmol/g for caffeic and chlorogenic acid, respectively. It was found that the adsorption mechanisms for both compounds was derived from π-π and electrostatic interactions. Also, the binary adsorption equilibrium was performed and the experimental data were interpreted using the extended multicomponent Langmuir model. The results evidenced that the binary adsorption of caffeic acid and chlorogenic acid is antagonistic in nature. The application of the first and second order kinetic models showed that the latter interpreted better the experimental data, obtaining R2 values close to one. Finally, the experimental adsorption rate data were interpreted by a diffusional model, finding the presence of different mass transfer resistances during the adsorption process. For both compounds, intraparticle diffusion mechanisms were meaningful.

Adsorption kinetics, isotherms and thermodynamics of atrazine removal using a banana peel based sorbent

2012 ◽  
Vol 65 (5) ◽  
pp. 940-947 ◽  
Author(s):  
Allen Chaparadza ◽  
Jeanne M. Hossenlopp
Keyword(s):  
Mass Transfer ◽  
Banana Peel ◽  
Maximum Adsorption Capacity ◽  
Adsorption Mechanisms ◽  
Atrazine Concentration ◽  
Equilibrium Data ◽  
Temperature Ranges ◽  
Simple Mass ◽  
Temperature Equilibrium ◽  
Increasing Temperature

Atrazine removal from water by treated banana peels was studied. The effect of pH, contact time, initial atrazine concentration, and temperature were investigated. Batch experiments demonstrated that 15 g L−1 adsorbent dosage removed 90–99% of atrazine from 1–150 ppm aqueous solutions. The removal was both pH and temperature dependent with the most atrazine removed between pH 7 and 8.2 and increased with increasing temperature. Equilibrium data fitted well to the Langmuir and Redlich–Peterson models in the concentration and temperature ranges investigated, with a maximum adsorption capacity of 14 mg g−1. Simple mass transfer models were applied to the experimental data to examine the adsorption mechanism and it was found that both external mass transfer and intraparticle diffusion played important roles in the adsorption mechanisms. The enthalpy of atrazine adsorption was evaluated to be 67.8 ± 6.3 kJ mol−l with a Gibbs free energy of –5.7 ± 1.2 kJ mol−1.

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