摘要
本论文在475nm下测定了不同吸附剂对油中色素类物质的吸附情况。通过分析所得的热力学参数,比较了活性碳C1和三种具有不同孔径分布的活性凹凸棒石(C2、C3、C4)四种吸附剂对油脂脱色过程中色素类物质的脱除效果。从理论上探索了凹凸棒石这种新型吸附剂在油脂脱色过程中对油中色素类物质的吸附特性。结果表明,活化的凹凸棒石比活性碳具有更强的去除油中色素类物质的能力。同时通过对四种吸附剂的比表面积及孔隙分布数据的分析比较,说明了吸附剂的的比表面积不能决定吸附剂的吸附效果,吸附剂和吸附质的极性越相近,吸附剂的孔径分布和吸附质的截面大小越相似,越有利于吸附作用的发生。
In this article we determinated the adsorption rate of oil bleached by different adsorbents at 475nm wavelength. From the isosteric adsorption values the bleaching effects of activated carbon were compared with different activated attapulgites wich three kinds of pore size distributions（C2, C3, C4）. The adsorption characteristics of this new kind of absorbent- attapulgites used in this bleaching process were investigated. The results showed that activated attapulgites are better than the activated carbon in processing colors adsorption. At the same time, this article compared the specific surface area and pore size distribution of these different adsorbents to elucidate that the specific surface area only can＇t decide the bleaching effect. The more the polarity of the adsorbents close to the color particles and the pore diameter of the adsortents similar to the molecular diameter of the adsorbate, the more adsorption happen.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2007年第3期25-29,共5页
Food Science
基金
国家自然科学基金项目(20376028)
2005年度教育部提名国家技术进步二等奖受奖项目
关键词
活性碳
凹凸棒石
色素类物质
比表面
孔径分布
F方程
carbon
attapulgites
colors
specific surface area
pore size distribution
Freundlich
