凹凸棒石油脂脱色行为及其机理  

Adsorption Behavior and Mechanism of Attapulgite When Used in Oil Bleaching

作　　者：周灵群 ZHOU Lingqun(College of Economics and Management,Nanjing University of Aeronautics and Astronautics,Nanjing 210008,China;School of Food Science and Technology,Jiangnan University,Wuxi 214122,China)

机构地区：[1]南京航空航天大学经济与管理学院,江苏南京210008 [2]江南大学食品学院,江苏无锡214122

出　　处：《食品科学》2019年第3期87-93,共7页Food Science

摘　　要：以凹凸棒石为大豆油脱色吸附剂,通过对其物理特性、脱色热力学和吸附动力学分析,探讨凹凸棒石吸附剂的吸附行为与脱色机理。结果表明,凹凸棒石吸附剂主要为短晶束和单晶形,其孔径集中分布于1.5～10.0 nm的范围内;脱色热力学分析表明,随着脱色温度升高,凹凸棒石的色素吸附能力逐渐增强,但温度不能改变吸附剂对色素类物质的作用方式;吸附动力学分析表明,叶绿素等微量成分在凹凸棒石上的吸附速率较快,正己烷纯溶液体系中吸附速率依次为叶绿素>亚油酸>磷脂>类胡萝卜素,而大豆油体系中吸附速率依次为叶绿素>类胡萝卜素>游离脂肪酸>磷脂。由此可知,凹凸棒石油脂脱色主要通过孔径填充吸附,并伴随有部分氢键吸附和化学吸附。In this study,attapulgite was used as an adsorbent in the bleaching process of soybean oil,and its adsorption behavior and mechanism were explored by physical characteristics,kinetic and thermodynamic analysis.Our investigation showed that attapulgite mainly consisted of small crystal bunches and monocrystals with pore size distributed in the range of 1.5-10.0nm.Thermodynamic analysis indicated that the adsorption capacity of attapulgite increased with elevating temperature,while the adsorption pattern kept stable.Kinetic analysis showed that attapulgite could rapidly adsorb minor components like chlorophyll.The adsorption rate onto attapulgite in hexane followed the decreasing order:chlorophyll>linoleic acid>phosphatide>carotenoid,whereas the adsorption rate in soybean oil followed the decreasing order:chlorophyll>carotenoid>free fatty acid>phosphatide.All the results revealed that the mechanism of oil bleaching with attapulgite was via pore filling adsorption accompanied by hydrogen bond adsorption and chemical adsorption.

关 键 词：凹凸棒石 油脂脱色 吸附动力学 机理 

分 类 号：TS229[轻工技术与工程—粮食、油脂及植物蛋白工程]