凹凸棒土/有机复合膜的制备及其染料吸附性能研究

Preparation of attapulgite/organic composite membrane and its dye adsorption properties

以凹凸棒土为原料,与PVDF、DMF和水混合后制成凹凸棒土/有机复合膜,分别采用酸化、碱处理、高温活化等不同方法进行改性,采用XRD、SEM表征了凹凸棒土粉末的形貌及内部结构,比较了不同改性方法下复合膜的结构差异,考察了复合膜对染料溶液的吸附能力。结果表明:凹凸棒土的引入有效提高了有机膜对染料的吸附性能,有利于使用后的液相分离;各种预处理方式均可有效提高复合膜对染料的吸附性能,酸处理和高温焙烧方式对吸附性能的提高更为显著,其最高吸附率分别为94.68%和94.5%;当复合膜使用量为0.1 g、含罗丹明废液浓度为10mg/L时,吸附率达到94.07%。

The attapulgite/organic composite membrane was prepared by mixing attapulgite,PVDF,DMF and distilled water.Acidification,alkali treatment and high temperature activation were used separately to modify the membrane.XRD and SEM were used to characterize the morphology and internal structure of attapulgite powder.The structural differences of composite membranes prepared by different modification methods were compared.The adsorption performance of the composite membrane for dye was investigated.The results show that the introduction of attapulgite effectively improves the adsorption performance of organic membrane for dyes and it is conducive to the separation of liquid phase.All the pre-treatment methods can effectively improve the adsorption performance of the composite membrane.Acidification and high-temperature calcination improve the adsorption performance more significantly than other pre-treatment methods,and their maximum adsorption rates are 94.68%and 94.5%,respectively.When the amount of composite membrane was 0.1 g and the concentration of rhodamine B was10 mg/L,the adsorption rate reaches 94.07%.