PVDF/改性凹凸棒土复合膜及其Ni（Ⅱ）吸附性能研究

摘要

分别将凹凸棒土(ATP)酸化处理、有机化预处理以及将单宁酸用甲醛固载在凹凸棒土上，进而将改性凹凸棒土与聚偏氟乙烯(PVDF)复合，采用相转化法制备PVDF/改性凹凸棒土复合膜。利用红外、透射电镜对改性凹凸棒土的结构和形态进行了表征，采用紫外吸收的方法研究了复合膜对水溶液中 Ni(Ⅱ)的吸附性能。研究结果表明，由单宁酸改性的凹凸棒土制备的PVDF复合膜能有效地去除水溶液中的 Ni (Ⅱ)，其吸附量较纯凹凸棒土改性的 PVDF 膜提高了34%。%In this work,attapulgite was modified by acidification,organic pretreatment and load the tannin acid on the attapulgite by formaldehyde,respectively.Then PVDF/modified attapulgite composite membrane was prepared by the method of phase inversion.The structure and morphology of the modified attapulgite was char-acterized by Fourier transform infrared and transmission electron microscope,and the adsorption of Ni(Ⅱ)was studied by the method of ultraviolet absorption.The results showed that composite membrane filled with the tannic acid-modified attapulgite could remove the Ni(Ⅱ)in the aqueous solution effectively,and the absorption increased by 34% than the membrane filled with pure attapulgite modified.