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Thermodynamic analysis of fatty acid harvesting by novel carbon-based adsorbent

  • Biological waste as resource, with a focus on food waste
  • Published:
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Abstract

In this study, separation and concentration of fatty acids (FA) from the synthetic food processing wastewater containing low concentration of FA (250 mg/L) were investigated using expanded graphite (EG) as a novel adsorbent at different temperatures (298~318 K). The adsorption results were further analyzed to verify adsorption mechanisms and thermodynamics of FA onto EG. Results show that the adsorption of FA onto EG was explained well by the Langmuir model with the maximum adsorption capacity up to 8.01 g FA/g EG at 298 K, and considerably affected by temperature. The adsorption kinetics fitted with pseudo-second-order kinetic model and the adsorption mechanism analysis showed that the intraparticle diffusion was not the rate-limiting step, but the coalescence of FA droplets played the significant role for novel adsorption of FA onto EG. The calculated activation energy and thermodynamic parameters such as Gibbs free energy change (ΔG0), enthalpy change (ΔH0), and entropy change (ΔS0) indicated that the adsorption of FA onto EG was very feasible, was highly spontaneous, occurred physically, was exothermic in nature, and was stable in aquatic environmental changes. Overall, FA can be effectively harvested and concentrated from the food processing wastewater by EG even at low concentration.

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Acknowledgments

This study is supported by the Young Faculty Research Program from Kyung Hee University (KHU-20110469). The authors declare that they have no conflict of interest. The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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  1. Department of Civil Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 446-701, Republic of Korea

    Quoc Cuong Do & Seoktae Kang

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  1. Quoc Cuong Do
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  2. Seoktae Kang
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Correspondence to Seoktae Kang.

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Responsible editor: Philippe Garrigues

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Do, Q.C., Kang, S. Thermodynamic analysis of fatty acid harvesting by novel carbon-based adsorbent. Environ Sci Pollut Res 23, 7146–7154 (2016). https://doi.org/10.1007/s11356-015-4428-4

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  • DOI: https://doi.org/10.1007/s11356-015-4428-4

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