Development of ion-permselective piezodialysis membranes

离子选择性渗透压电渗析膜的开发

基本信息

批准号：
60470066
负责人：
TAKAGI Makoto
金额：
$ 3.01万
依托单位：
Kyushu University, Faculty of Engineering
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60470066/
关键词：
piezodialysis polymer membrane reverse osmosis separation of metal ions solvent extraction adsorption of metal complex ion 分子認識分離膜金属イオン荷電モザイク膜金属錯体の吸着

项目摘要

Piezodialysis membranes with ion-selective permeability were developed. The basic strategy for the development was as follows: 1. Metal ions in aqueous solution are complexed with halide or pseudo-halide anions to produce charge neutralized or anionic metal complexes. 2. The neutral complexes are sorped (extracted) and concentrated onto the membrane phase, while anionic complexes are similarly sorpted by forming ion-pair complexes with appropriate cations in solution. 3. The sorped metal species then permeate the membrane under coupling with a solvent flow through the membrance under hydraulic pressure.This is a new concept of ion-selective piezodialysis, where the skin layer of dialysis membrane assumes the role of organic solvents in conventional solvent extraction and the metal selectivity in solvent extraction is extended to ion-selective piezodialysis.The above concept was experimentally realized with cellulose acetate (CA) membranes. Though CA is a solid polymer, it sorped metal complexes just like ordinary organic solvents of related chemical structure like methyl isobutyl ketone and dlycerol triacetate. As an example, the ease of CA membrane permeation by thiocyanate complexes was in the order, Zn>In>Fe(III)>Cd>Ni. A variety of other polymer materials was tested, but the metal selectivity was generally similar to CA, and the permeability was inferior to the case of CA. In order to search for new metal sorption selectivity to organic media, several basic approaches were made which included the use of liquid crystals as extraction media and the use of the concept of molecular recognition of ion-pair entity in solvent extraction systems.

开发了具有离子选择性通透性的压电透析膜。该开发的基本策略如下：1。水溶液中的金属离子与卤化物或伪壁式阴离子复合，以产生电荷中和中和金属络合物。 2。中性络合物被涂抹（提取）并浓缩到膜相中，而阴离子复合物则通过在溶液中使用适当的阳离子形成离子对复合物，同样地吸附了离子对配合物。 3。然后，吸附的金属物种在液压压力下与通过膜通过膜的溶剂流渗透到膜下。这是一个新的概念，是离子选择性的压电透析的新概念，其中透析膜的皮肤层假定有机溶剂在传统溶剂中的作用提取和溶剂提取中的金属选择性扩展到离子选择性压电透析。尽管Ca是一种固体聚合物，但它像相关化学结构的普通有机溶剂（如甲基异丁基酮和三乙酸甘油酯）一样，刺激了金属络合物。例如，硫氰酸酯复合物的Ca膜渗透性在>（iii）> cd> ni的顺序中。测试了各种其他聚合物材料，但是金属的选择性通常与CA相似，并且渗透性不如Ca的情况下。为了搜索对有机培养基的新金属吸附选择性，制作了几种基本方法，其中包括将液晶用作提取介质以及在溶剂提取系统中使用离子对实体的分子识别概念的使用。