阴-阳离子有机膨润土协同吸附作用及其机理研究

合成并研究了一系列阴-阳离子有机膨润土对水中苯酚、苯的吸附作用及其机理.结果表明,阴-阳离子有机膨润土对水中有机物具有协同吸附作用,其作用大小与改性时所用表面活性剂的种类、组成、配比及有机物本身的性质有关;对苯酚的吸附符合Langmuir和Freundlich吸附等温式,是分配作用(partition)和表面吸附(adsorption)共同作用的结果,分配作用的贡献率随改性时阴离子表面活性剂加入量的增大而增大;对水中苯的吸附以分配作用为主,分配系数大于原土及单阳离子有机膨润土,且与有机碳含量呈正相关.

Studies on the synergic sorption and its mechanism of anion-cation organobentonites.

A series of anion-cation organobentonites are synthesized and their sorption of phenol and benzene from water and its mechanism are investigated. Results show that anion-cation organobentonites possess the synergic sorption of organic compounds in water and the sorption capacity relates to the kind, composition and partition ratio of the modifying bentonite as well as the property of organic compounds. Sorptions of phenol fit to Freundlich and Langmuir isotherms equations; and are the results of synergic adsorption and partition occur to the sorption of phenol to anion-cation organobentonites. The rate of partition contribution increases with the increase of the amount of anion surfactants during the modification. Sorptions of benzene in water depends mainly on partition; and the sorption coefficients are greater than those of original and single cation organobentonite, and correlated with the organic carbon contents of organobentonites.