Mechanism and role of partitioning in removal of organics by RO and NF composite membranes
| Autor: | Y. Oren, Adi Ben-David, S. Basson, Viatcheslav Freger |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Aqueous solution
Chemistry Mechanical Engineering General Chemical Engineering Size-exclusion chromatography Sorption General Chemistry Membrane Molecular size Chemical engineering Mechanism (philosophy) Polyamide Organic chemistry General Materials Science Composite membrane Water Science and Technology |
| Zdroj: | Desalination. 199:49-51 |
| ISSN: | 0011-9164 |
| DOI: | 10.1016/j.desal.2006.03.140 |
| Popis: | Size exclusion (sieving) is customarily believedto be the main rejection mechanism for neutralsolutes in RO and NF. It is known, however, thatsome neutral organics show strong deviationsfrom trends based solely on the molecular size[1–5]. This suggests that thermodynamic factorssuch as sorption (partitioning) may also play animportant role. Te test this postulation, someauthors estimated sorption of organics for wholeRO/NF membranes [4,5]. Unfortunately, thesedata do not distinguish sorption in the activelayer from that by the support, which could beoverwhelmingly large since it is 3–4 orders ofmagnitude thicker than the active polyamidelayer. In this report we present a novel approachfor direct measurements of the partitioning oforganic solutes between aqueous solutions andthe polyamide layer using FTIR. |
| Databáze: | OpenAIRE |
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