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.

中文翻译：

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高压电场辅助漂白对大豆油中微量元素和色素吸附的动力学、等温线和热力学研究：比较研究

摘要 本研究采用高压电场 (HVEF) 漂白法在不同电压 (10 和 20 kV)、温度 (35–65 °C)、时间 (0–30 分钟) 和粘土百分比 (0.5–2 %)，然后与工业漂白方法 (IBM) 进行比较。在 IBM 和 HVEF 下在 10 和 20 kV 两个电压下吸附在活化膨润土上的离子和颜料的动力学数据遵循伪一级模型（PFOM）的机制。类胡萝卜素和叶绿素平衡数据遵循 Freundlich 等温线型模型，表明在 HVEF 下多层吸附。热力学参数（ΔG°、ΔH°、和 ΔS°) 表明在 IBM 和 HVEF 下，微量金属离子和颜料在膨润土上的吸附是可行的，在 35 到 65°C 之间吸热和自发。结果表明，HVEF，特别是在较高电压下，比IBM具有更高的去除大豆油中金属离子和色素的能力。以HVEF-20 kV > HVEF-10 kV > IBM的顺序获得大豆油漂白对金属和色素的最高去除能力。