A method for characterizing membranes during nanofiltration at extreme pH

Mayur Dalwani, Nieck Edwin Benes, Gerrald Bargeman, Dimitrios Stamatialis, Matthias Wessling

Research output: Contribution to journalArticleAcademic

47 Citations (Scopus)

Abstract

This work presents a method for molecular weight cut off (MWCO) characterization of nanofiltration membranes, in a broad range of acidic and alkaline environments. Polyethylene glycols (PEG) have been identified as suitable marker molecules with sufficient chemical stability under the harsh conditions of interest. PEG molecular weight distributions have been analyzed using gel permeation chromatography (GPC). To allow quantitative GPC analysis, a protocol is presented to overcome the problem of an overlapping salt peak in the GPC elugram. The method is applied to a well-known commercial nanofiltration membrane (NF-270, DOW FILMTEC™) in the pH range 2–12. This membrane has similar MWCO (270 g mol−1) and permeance (10 L m−2 h−1 bar−1) in acid environment and at neutral conditions. At pH = 12 a reversible increase was observed for the MWCO (380 g mol−1) and the permeance (12 L m−2 h−1 bar−1). This demonstrates the added value of our method to observe the change of MWCO as a function of pH during nanofiltration at the relevant conditions.
Original languageUndefined
Pages (from-to)188-194
JournalJournal of membrane science
Volume363
Issue number1-2
DOIs
Publication statusPublished - 2010

Keywords

  • IR-73947

Cite this

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title = "A method for characterizing membranes during nanofiltration at extreme pH",
abstract = "This work presents a method for molecular weight cut off (MWCO) characterization of nanofiltration membranes, in a broad range of acidic and alkaline environments. Polyethylene glycols (PEG) have been identified as suitable marker molecules with sufficient chemical stability under the harsh conditions of interest. PEG molecular weight distributions have been analyzed using gel permeation chromatography (GPC). To allow quantitative GPC analysis, a protocol is presented to overcome the problem of an overlapping salt peak in the GPC elugram. The method is applied to a well-known commercial nanofiltration membrane (NF-270, DOW FILMTEC™) in the pH range 2–12. This membrane has similar MWCO (270 g mol−1) and permeance (10 L m−2 h−1 bar−1) in acid environment and at neutral conditions. At pH = 12 a reversible increase was observed for the MWCO (380 g mol−1) and the permeance (12 L m−2 h−1 bar−1). This demonstrates the added value of our method to observe the change of MWCO as a function of pH during nanofiltration at the relevant conditions.",
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A method for characterizing membranes during nanofiltration at extreme pH. / Dalwani, Mayur; Benes, Nieck Edwin; Bargeman, Gerrald; Stamatialis, Dimitrios; Wessling, Matthias.

In: Journal of membrane science, Vol. 363, No. 1-2, 2010, p. 188-194.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - A method for characterizing membranes during nanofiltration at extreme pH

AU - Dalwani, Mayur

AU - Benes, Nieck Edwin

AU - Bargeman, Gerrald

AU - Stamatialis, Dimitrios

AU - Wessling, Matthias

PY - 2010

Y1 - 2010

N2 - This work presents a method for molecular weight cut off (MWCO) characterization of nanofiltration membranes, in a broad range of acidic and alkaline environments. Polyethylene glycols (PEG) have been identified as suitable marker molecules with sufficient chemical stability under the harsh conditions of interest. PEG molecular weight distributions have been analyzed using gel permeation chromatography (GPC). To allow quantitative GPC analysis, a protocol is presented to overcome the problem of an overlapping salt peak in the GPC elugram. The method is applied to a well-known commercial nanofiltration membrane (NF-270, DOW FILMTEC™) in the pH range 2–12. This membrane has similar MWCO (270 g mol−1) and permeance (10 L m−2 h−1 bar−1) in acid environment and at neutral conditions. At pH = 12 a reversible increase was observed for the MWCO (380 g mol−1) and the permeance (12 L m−2 h−1 bar−1). This demonstrates the added value of our method to observe the change of MWCO as a function of pH during nanofiltration at the relevant conditions.

AB - This work presents a method for molecular weight cut off (MWCO) characterization of nanofiltration membranes, in a broad range of acidic and alkaline environments. Polyethylene glycols (PEG) have been identified as suitable marker molecules with sufficient chemical stability under the harsh conditions of interest. PEG molecular weight distributions have been analyzed using gel permeation chromatography (GPC). To allow quantitative GPC analysis, a protocol is presented to overcome the problem of an overlapping salt peak in the GPC elugram. The method is applied to a well-known commercial nanofiltration membrane (NF-270, DOW FILMTEC™) in the pH range 2–12. This membrane has similar MWCO (270 g mol−1) and permeance (10 L m−2 h−1 bar−1) in acid environment and at neutral conditions. At pH = 12 a reversible increase was observed for the MWCO (380 g mol−1) and the permeance (12 L m−2 h−1 bar−1). This demonstrates the added value of our method to observe the change of MWCO as a function of pH during nanofiltration at the relevant conditions.

KW - IR-73947

U2 - 10.1016/j.memsci.2010.07.025

DO - 10.1016/j.memsci.2010.07.025

M3 - Article

VL - 363

SP - 188

EP - 194

JO - Journal of membrane science

JF - Journal of membrane science

SN - 0376-7388

IS - 1-2

ER -