Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

Nirakar Pradhan, Eldon R. Rene, Piet N. L. Lens, Laura Dipasquale, Giuliana D’Ippolito, Angelo Fontana, Antonio Panico and Giovanni Esposito
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Nirakar Pradhan: Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio, 43, 03043 Cassino, Italy
Eldon R. Rene: UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX Delft, The Netherlands
Piet N. L. Lens: UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX Delft, The Netherlands
Laura Dipasquale: Institute of Biomolecular Chemistry, Italian National Council of Research, Via Campi Flegrei 34, 80078 Napoli, Italy
Giuliana D’Ippolito: Institute of Biomolecular Chemistry, Italian National Council of Research, Via Campi Flegrei 34, 80078 Napoli, Italy
Angelo Fontana: Institute of Biomolecular Chemistry, Italian National Council of Research, Via Campi Flegrei 34, 80078 Napoli, Italy
Antonio Panico: Department of Civil Engineering, Telematic University Pegaso, Piazza Trieste E Trento, 48, 80132 Naples, Italy
Giovanni Esposito: Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio, 43, 03043 Cassino, Italy

Energies, 2017, vol. 10, issue 5, 1-16

Abstract: Solid-liquid extraction (adsorption or ion exchange) is a promising approach for the in situ separation of organic acids from fermentation broths. In this study, a diluted concentration of lactic acid (<10 g/L) separation from a model fermentation broth by granular activated carbon (GAC) as well as weak (Reillex ® 425 or RLX425) and strong (Amberlite ® IRA-400 or AMB400) base anion exchange resins under various operating conditions was experimentally investigated. Thermodynamic analysis showed that the best lactic acid adsorption performances were obtained at a pH below the pK a value of lactic acid (i.e., 3.86) for GAC and RLX425 by physical adsorption mechanism and above the pK a value for the AMB400 resin by an ion exchange mechanism, respectively. The adsorption capacity for GAC (38.2 mg/g) was the highest, followed by AMB400 (31.2 mg/g) and RLX425 (17.2 mg/g). As per the thermodynamic analysis, the lactic acid adsorbed onto GAC and RLX425 through a physical adsorption mechanism, whereas the lactic acid adsorbed onto AMB400 with an ion exchange mechanism. The Langmuir adsorption isotherm model ( R 2 > 0.96) and the pseudo-second order kinetic model ( R 2 ~ 1) fitted better to the experimental data than the other models tested. Postulating the conditions for the real fermentation broth (pH: 5.0–6.5 and temperature: 30–80 °C), the resin AMB400 represents an ideal candidate for the extraction of lactic acid during fermentation.

Keywords: lactic acid; adsorption; kinetics; isotherms; thermodynamics; ion exchange (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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