Rejection of ions by NF membranes for binary electrolyte solutions of NaCl, NaNO"3, CaCl"2 and Ca(NO"3)"2 [An article from: Desalination] Review
Rejection of ions by NF membranes for binary electrolyte solutions of NaCl, NaNO"3, CaCl"2 and Ca(NO"3)"2 [An article from: Desalination] Feature
This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Permeation experiments of binary electrolyte solutions of NaCl, NaNO"3, CaCl"2 and Ca(NO"3)"2 through three kinds of NF membranes (ESNA 1-LF, ESNA 1 and LES 90) were carried out to investigate the effects of the ionic species and their interactions on the rejections of the NF membranes. The experimental results indicate that the observed rejections of Ca^2^+ by NF membranes all slightly increased with the growth of the concentration of Na^+ and the observed rejection of Na^+ decreased with the growth of the concentration of Ca^2^+. The repulsion force of the membrane negative charges on the cation with lower charge density are weaker, thus it presents higher permeability and lower rejection. The observed rejections of Cl^- and NO"3^- by NF membranes were almost constant and hardly changed with the equivalent fractions of Cl^- and NO"3^- in binary electrolyte solutions. For charged species, the electrostatic mechanisms play a more important role in NF separation.
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