Kinetic,isotherm and thermodynamic investigations on adsorption of trace elements and pigments from soybean oil using high voltage electric field-assisted bleaching: A comparative study |
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| Institution: | 1. Department of Food Science and Technology, Faculty of Agriculture, Fasa University, Fasa, Iran;2. Department of Water Engineering, Faculty of Agriculture, Fasa University, Fasa, Iran;3. Department of Food Science and Technology, Tarbiat Modares University, Tehran, Iran;1. Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand;2. Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand;1. Department of Natural Resources and Environmental Engineering, School of Agriculture, Department of Fisheries, Shiraz University, P.O.BOX 71441-65186, Shiraz, Fars, Iran;2. Department of Natural Resources and Environmental Engineering, School of Agriculture, Shiraz University, P.O.BOX 71441-65186, Shiraz, Fars, Iran;3. Department of Fisheries, Faculty of Natural Resources, Urmia University, Nazlou Campus, 11th km of Serow Road, Urmia, Iran |
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| Abstract: | In this study, the amounts of trace elements (Fe (II) and Cu (II)) and pigments (chlorophyll and carotenoid) in soybean oil were evaluated under high voltage electric field (HVEF) bleaching method at different voltage (10 and 20 kV), temperature (35–65 °C), time (0−30 min) and clay percentage (0.5–2 %) and then were compared to the industrial bleaching method (IBM). The kinetic data of ions and pigments adsorbed on activated bentonite clay under IBM and HVEF at two voltages of 10 and 20 kV followed the mechanism of the pseudo-first-order model (PFOM). The carotenoid and chlorophyll equilibrium data followed a Freundlich isotherm type model, which demonstrated multilayer adsorption under HVEF. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) displayed that the adsorption of trace metal ions and pigments on bentonite clay under IBM and HVEF were feasible, endothermic and spontaneous between 35 and 65 °C. The results indicated that the HVEF, especially at higher voltage, has a high remarkable capability to remove metal ions and pigments from soybean oil than the IBM. The highest removal capacity for metal and pigments of soybean oil bleaching were obtained in the order of HVEF-20 kV > HVEF-10 kV > IBM. |
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| Keywords: | Soybean oil Pseudo-first-order model High voltage electric field Freundlich isotherm Endothermic |
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