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扩散渗析条件下聚合物薄膜和膜对盐溶液中单价和二价阳离子分离的比较研究

A comparative study on the monovalent and divalent cation separation of polymeric films and membranes from salt solutions under diffusion-dialysis.

作者信息

Acar Serkan, Cengİz Hacer Yeşim, ErgÜn Ayça, Konyali Eymen, DelİgÖz Hüseyin

机构信息

Department of Chemical Engineering, Engineering Faculty, İstanbul University-Cerrahpaşa, İstanbul Turkey.

出版信息

Turk J Chem. 2020 Aug 18;44(4):1134-1147. doi: 10.3906/kim-2004-26. eCollection 2020.

DOI:10.3906/kim-2004-26
PMID:33488218
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7751909/
Abstract

This study deals with selective separation of mono- and divalent cations from aqueous salt solutions using polymeric films based on polyethylene (PE) and polyamide6 (PA6), and two different commercial nanofiltration (NF) membranes. The diffusion rates (D) of ions (Na and Ca), separation factors (α) and ion rejections (R) of the films and NF membranes are examined comparatively as well as their surface morphology and hydrophilicity. It is observed that the diffusion rates of Na are in the range of 0.7-1.8 × 10cm .s in the decreasing order of PE > NF90 > NF270 > PA6 while Ca shows diffusion rates of 7.4-18.4 × 10 cm .s in the increasing order of NF270 > NF90 ≈ PA6 > PE. Rejection values of the polymeric films and NF membranes against to Na and Ca vary between 90% and 99.6%.The highest α(Ca/Na) is found to be 20 for PA6 film. D, α, and R value of both polymeric films and NF membranes are strongly affected by the existence of osmosis during diffusion-dialysis and the sizes of hydrated sodiu and calcium ions. In conclusion, the film based on PA6 may be a good alternative for selective separation of mono- an divalent cations.

摘要

本研究涉及使用基于聚乙烯（PE）和聚酰胺6（PA6）的聚合物膜以及两种不同的商业纳滤（NF）膜从盐水溶液中选择性分离单价和二价阳离子。对膜和NF膜的离子（Na和Ca）扩散速率（D）、分离因子（α）和离子截留率（R）以及它们的表面形态和亲水性进行了比较研究。观察到Na的扩散速率在0.7 - 1.8×10cm².s范围内，顺序为PE > NF90 > NF270 > PA6递减，而Ca的扩散速率在7.4 - 18.4×10cm².s范围内，顺序为NF270 > NF90 ≈ PA6 > PE递增。聚合物膜和NF膜对Na和Ca的截留值在90%至99.6%之间变化。发现PA6膜的最高α（Ca/Na）为20。聚合物膜和NF膜的D、α和R值在扩散渗析过程中受渗透作用的存在以及水合钠离子和钙离子大小的强烈影响。总之，基于PA6的膜可能是选择性分离单价和二价阳离子的良好替代品。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/9bf4ef69ab1f/turkjchem-44-1134-fig006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/7d8d77a76b28/turkjchem-44-1134-fig001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/e16f1b572721/turkjchem-44-1134-fig002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/10616ace3180/turkjchem-44-1134-fig003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/1d486854a889/turkjchem-44-1134-fig004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/f4e58185bfe9/turkjchem-44-1134-fig005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/9bf4ef69ab1f/turkjchem-44-1134-fig006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/7d8d77a76b28/turkjchem-44-1134-fig001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/e16f1b572721/turkjchem-44-1134-fig002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/10616ace3180/turkjchem-44-1134-fig003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/1d486854a889/turkjchem-44-1134-fig004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/f4e58185bfe9/turkjchem-44-1134-fig005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a05/7751909/9bf4ef69ab1f/turkjchem-44-1134-fig006.jpg

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