AGRIS

Data provider:

Icon data provider

The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Active (Data provider submitted metadata in the last calendar year)
Journal Article

Journal Article

Influence of monomer concentrations on the performance of polyamide-based thin film composite forward osmosis membranes  [2011]

Wei, Jing; Liu, Xin; Qiu, Changquan; Wang, Rong; et al.

Access the full text

Polyamide thin film composite (TFC) membranes with tailored porous substrate and rejection layer are promising for forward osmosis (FO) applications. The current study investigates the effect of rejection layer synthesis conditions on the performance of the resulting TFC polyamide FO membranes. The influence of monomer concentrations (i.e., m-phenylenediamine (MPD) and trimesoyl chloride (TMC) concentrations) on the membrane separation properties as well as FO performance was systematically studied. A strong trade-off between the water permeability and salt rejection was observed, where increasing the TMC concentration or reducing the MPD concentration resulted in higher membrane permeability but lower salt rejection. In FO tests, membranes with poor salt rejection had severe solute reverse diffusion, which enhanced the internal concentration polarization (ICP). It was found that the FO water flux was governed by both the membrane water permeability and its solute rejection. For a membrane with higher water permeability but lower solute rejection, the reduced membrane frictional resistance was compensated by the simultaneously more severe solute-reverse-diffusion-induced ICP. The net effect on the FO water flux depends on the competition of these two opposing mechanisms. Under conditions where solute reverse diffusion may cause severe ICP (e.g., high draw solution concentration and high water flux level), membranes need be optimized to achieve a high salt
rejection even if this is at the expense of lower water permeability.
From the journal
Journal of membrane science
ISSN : 0376-7388

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2016
Volume:
381
Issue:
1-2
Start Page:
110
End Page:
117
Publisher:
Elsevier B.V.
All titles:
"Influence of monomer concentrations on the performance of polyamide-based thin film composite forward osmosis membranes"@eng
Loading...

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2016
Volume:
381
Issue:
1-2
Start Page:
110
End Page:
117
Publisher:
Elsevier B.V.
All titles:
"Influence of monomer concentrations on the performance of polyamide-based thin film composite forward osmosis membranes"@eng