Adsorption characteristics of malic acid from aqueous solutions by weakly basic ion-exchange chromatography
| Autor: | Jian Zhang, Qiang Gao, Yan Zhu, Chaoqiang Pan, Depei Wang, Fabao Liu, Fuping Lu |
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| Rok vydání: | 2012 |
| Předmět: |
Exothermic reaction
Chromatography Aqueous solution fungi Organic Chemistry Ion chromatography Kinetics Malates food and beverages Langmuir adsorption model General Medicine Chromatography Ion Exchange Biochemistry Analytical Chemistry chemistry.chemical_compound symbols.namesake Adsorption chemistry Diffusion process symbols Thermodynamics Ion Exchange Resins Malic acid |
| Zdroj: | Journal of Chromatography A. 1251:148-153 |
| ISSN: | 0021-9673 |
| Popis: | In this study, we reported the effects of temperature, malic acid loading concentration, and resin dose on malic acid adsorption by IRA-67 in batch experiments. The kinetic data well fitted the pseudo-second-order kinetic model. Both the equilibrium and ultimate adsorption slightly decreased with increased temperature from 303 to 323 K at 74.7 g/L malic acid loading concentration. The malic acid adsorption was revealed as a homogeneous adsorbent process by the Langmuir model and film diffusion process at loading concentrations of 18.2–94.5 g/L malic acid by the Boyd plot. The values of effective diffusion coefficient D i also increased with the temperature. Based on Eq. (15) , the negative values of Δ G ° and Δ H ° revealed that the adsorption process was spontaneous and exothermic. The negative value of Δ S ° also indicated the decrease in the solid–liquid interface randomness at this interface when malic acid is adsorbed by IRA-67. |
| Databáze: | OpenAIRE |
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