权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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.

研制了具有离子选择透过性的压电渗析膜。发展的基本战略如下：1。水溶液中的金属离子与卤化物或拟卤化物阴离子络合以产生电荷中和或阴离子金属络合物。2.中性络合物被吸附（萃取）并浓缩到膜相上，而阴离子络合物通过与溶液中的适当阳离子形成离子对络合物而被类似地吸附。3.吸附的金属物质然后在与在液压下通过膜的溶剂流耦合的情况下透过膜。这是离子选择性压渗析的新概念，其中透析膜的皮层在传统的溶剂萃取中扮演有机溶剂的角色，并将溶剂萃取中的金属选择性扩展到离子选择性压电透析，并以醋酸纤维素（CA）为实验材料实现了上述概念。膜。CA虽然是固体聚合物，但它对金属络合物的吸附与化学结构相关的普通有机溶剂如甲基异丁基酮和甘油三乙酸酯一样。硫氰酸盐络合物对CA膜渗透的难易程度为Zn>In>Fe（III）>Cd>Ni。测试了多种其他聚合物材料，但金属选择性通常与CA相似，而渗透性则不如CA。为了寻找新的金属对有机介质的吸附选择性，提出了几种基本方法，包括使用液晶作为萃取介质和在溶剂萃取体系中使用离子对实体的分子识别概念。