SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 40 ›› Issue (12): 78-87.DOI: 10.1016/j.cjche.2020.08.054

• Separation Science and Engineering • 上一篇    下一篇

Synthesis of spinel ferrite and its role in the removal of free fatty acids from deteriorated vegetable oil

Adewale Adewuyi1, Adole I. Ogagbolo2, Woei Jye Lau3, Rotimi A. Oderinde2   

  1. 1. Department of Chemical Sciences, Faculty of Natural Sciences, Redeemer’s University, Ede, Osun State, Nigeria;
    2. Department of Chemistry, Faculty of Natural Science, University of Ibadan, Ibadan, Oyo State, Nigeria;
    3. School of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • 收稿日期:2020-06-15 修回日期:2020-08-13 出版日期:2021-12-28 发布日期:2022-01-14
  • 通讯作者: Adewale Adewuyi,E-mail:walexy62@yahoo.com
  • 基金资助:
    First and corresponding authors are grateful to the Department of Chemical Sciences, Redeemer’s University, Nigeria for provision of research space and chemicals.

Synthesis of spinel ferrite and its role in the removal of free fatty acids from deteriorated vegetable oil

Adewale Adewuyi1, Adole I. Ogagbolo2, Woei Jye Lau3, Rotimi A. Oderinde2   

  1. 1. Department of Chemical Sciences, Faculty of Natural Sciences, Redeemer’s University, Ede, Osun State, Nigeria;
    2. Department of Chemistry, Faculty of Natural Science, University of Ibadan, Ibadan, Oyo State, Nigeria;
    3. School of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • Received:2020-06-15 Revised:2020-08-13 Online:2021-12-28 Published:2022-01-14
  • Contact: Adewale Adewuyi,E-mail:walexy62@yahoo.com
  • Supported by:
    First and corresponding authors are grateful to the Department of Chemical Sciences, Redeemer’s University, Nigeria for provision of research space and chemicals.

摘要: Deterioration and loss of quality of vegetable oil is a big challenge in the food industry. This study investigated the synthesis of nickel ferrite (NiFe2O4) via co-precipitation method and its use for the removal of free fatty acids (FFAs) in deteriorated vegetable oil. NiFe2O4 was characterized using Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric (TG) analysis, Brunauer–Emmett–Teller (BET) surface area, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Synthesis of NiFe2O4 was confirmed by characterization, which revealed a BET surface area of 16.30 m2·g-1 and crystallite size of 29 nm. NiFe2O4 exhibited an adsorption capacity of 145.20 L·kg-1 towards FFAs with an 80.69% removal in a process, which obeys Langmuir isotherm and can be described by the pseudo-second-order kinetic model. The process has enthalpy (ΔH) of 11.251 kJ·mol-1 and entropy (ΔS) of 0.038 kJ·mol-1·K-1 with negative free energy change (ΔG), which suggests the process to be spontaneous and endothermic. The quantum chemical computation analysis via density functional theory further revealed the sorption mechanism of FFAs by NiFe2O4 occurred via donor–acceptor interaction, which may be described by the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO). The study showed NiFe2O4 to be a potential means that can remove FFAs from deteriorated vegetable oil.

关键词: Adsorption, Co-precipitation, Deteriorated vegetable oil, Free fatty acid (FFA), Langmuir

Abstract: Deterioration and loss of quality of vegetable oil is a big challenge in the food industry. This study investigated the synthesis of nickel ferrite (NiFe2O4) via co-precipitation method and its use for the removal of free fatty acids (FFAs) in deteriorated vegetable oil. NiFe2O4 was characterized using Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric (TG) analysis, Brunauer–Emmett–Teller (BET) surface area, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Synthesis of NiFe2O4 was confirmed by characterization, which revealed a BET surface area of 16.30 m2·g-1 and crystallite size of 29 nm. NiFe2O4 exhibited an adsorption capacity of 145.20 L·kg-1 towards FFAs with an 80.69% removal in a process, which obeys Langmuir isotherm and can be described by the pseudo-second-order kinetic model. The process has enthalpy (ΔH) of 11.251 kJ·mol-1 and entropy (ΔS) of 0.038 kJ·mol-1·K-1 with negative free energy change (ΔG), which suggests the process to be spontaneous and endothermic. The quantum chemical computation analysis via density functional theory further revealed the sorption mechanism of FFAs by NiFe2O4 occurred via donor–acceptor interaction, which may be described by the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO). The study showed NiFe2O4 to be a potential means that can remove FFAs from deteriorated vegetable oil.

Key words: Adsorption, Co-precipitation, Deteriorated vegetable oil, Free fatty acid (FFA), Langmuir