Meesuk Ladda, Vorasith Niramon
Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2006;41(6):1189-200. doi: 10.1080/10934520600623083.
Acid-activated bentonite was used as a bleaching agent to remove the dark color in repeatingly used palm oil. Two bentonite samples with different colors were used. It was found that the paler one gave better bleaching results. The optimum condition needed 5 h to reflux bentonite with sulfuric acid; pH of the bentonite suspension was 3, bleaching temperature was 80-85 degrees C and bleaching time was 30 min. The experiments also showed that bentonite could adsorb impurities and toxic compounds such as benzo(a)pyrene in palm oil. Chemical and physical properties of the bentonite samples were analyzed by X-ray fluorescence spectrometer (XRF), X-ray diffraction spectrometer (XRD) and scanning electron microscope (SEM). Particle size and specific surface area were also studied.
酸活化膨润土被用作漂白剂，以去除反复使用的棕榈油中的深色。使用了两种不同颜色的膨润土样品。发现颜色较浅的样品具有更好的漂白效果。最佳条件是膨润土与硫酸回流5小时；膨润土悬浮液的pH值为3，漂白温度为80 - 85摄氏度，漂白时间为30分钟。实验还表明，膨润土可以吸附棕榈油中的杂质和有毒化合物，如苯并(a)芘。通过X射线荧光光谱仪（XRF）、X射线衍射光谱仪（XRD）和扫描电子显微镜（SEM）对膨润土样品的化学和物理性质进行了分析。还研究了粒径和比表面积。
