有机膨润土吸附水中有机物的盐效应及其机理

实验室模拟研究了一系列双阳离子有机膨润土对水中不同浓度的对硝基苯酚的吸附性能.结果表明,土样有机碳含量越高,对硝基苯酚初始浓度越低,有机膨润土对其吸附性能越好.试验了多种无机盐对有机膨润土吸附性能的影响,发现盐效应与离子荷径比和膨润土改性表面活性剂有关.无机盐阳离子相同时,盐效应与阴离子荷径比成反比;无机盐阴离子相同时,与阳离子荷径比成正比.单阳离子有机膨润土的盐效应呈负效应,长短碳链比例相当的双阳离子有机膨润土的盐效应呈正效应.

The salt effect and its mechanism of adsorbing the organism in water by organobentonite

The sorption property of a series of dual-cation organobentonites in adsorbing the p-nitrophenol of different concentration in water was studied with simulation technique in laboratory. The results indicated that sorptionproperty of organobentonites was better with higher organic carbon contents in soil sample and lower concentration of p-nitrophenol. The influence of many kinds of inorganic salt on sorption property of organobentonites were tested and it was found that the salt effects were relevant to the bentonite modificative surfactant and charge size ratio of ion. The salt effects were negatively correlated to charge size ratio of anion when the cations of inorganic salt were same; and werepositively correlated to charge size ratio of cation when the anions of inorganic salt were same. The salt effects of single cation of organobentonites presented negative effects; and the salt effects of dual-cation organobentonite with suitable proportion of long and short carbon chains presented positive effects.