凹凸棒石、膨润土和活性炭吸附油中色素的研究

通过对凹凸棒石和膨润土酸活性点的测定和比较,以及对凹凸棒石、膨润土和活性炭的比表面积、孔径分布以及对油中叶绿素和胡萝卜素吸附的比较研究结果表明:凹凸棒石的B-、L-酸活性点均比膨润土高;对于膨润土和凹凸棒土,酸活性点多、孔径较大、比表面积大对叶绿素和胡萝卜素的吸附越有利,L-酸活性点主要吸附胡萝卜素;吸附剂在对叶绿素和胡萝卜的吸附过程中,起决定作用的是吸附剂与吸附质之间的相互作用力,只有在作用力较强时,比表面积和孔径分布才会对吸附效果产生影响。

ADSORPTION OF CHLOROPHYLL AND CAROTENE ON ATTAPULGITE ,MONTMORILLONITE AND ACTIVATED CARBONS FROM SOFT OIL

Through the measurement and comparision of the physicochemical properties,the specific surface area and pore size of attapulgite,montmorillonite,and activated carbons,the active point of attapulgite and montmorillonite,and the adsorption of the chlorophyll and the carotene on attapulgite,montmorillonite and activated carbons are researched.The results show that attapulgite has more Bronsted acid sites and Lewis acid sites than montmorillonite.The more active sites,lager pore size,and bigger specific surface of attapulgite and the montmorillonite lead to the more absorption of the chlorophyll and carotene,and the carotenethe is mainly adsorbed on the Lewis acid sites.The interaction between the absorbent and adsorbate plays an important role in absorption and the absorption is affected by specific surface area and pore size when the interaction power becomes strong.