Title

Influences of molecular weight, molecular size, flux, and recovery for aromatic pesticide removal by nanofiltration membranes

Authors

Authors

S. S. Chen; J. S. Taylor; L. A. Mulford;C. D. Norris

Comments

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Abbreviated Journal Title

Desalination

Keywords

aromatic pesticide; nanofiltration; molecular weight; molecular length; and width; flux; recovery; diffusion control; REVERSE-OSMOSIS; REJECTION PROPERTIES; AQUEOUS-SOLUTION; MICROPOLLUTANTS; SEPARATION; Engineering, Chemical; Water Resources

Abstract

Eleven aromatic pesticides were used for a removal study using a 4040 spiral-wound polyamide nanofiltration (NF) membrane. The influences of molecular weight, molecular size (length and width), flux, and recovery were studied. The molecular weights of these pesticides are from 198 Da to 286 Da. Molecular sizes were determined by theoretical calculation for their length and width by "Hyperchem" based on their structures and orientation. Furthermore, the study held constant for two operated recoveries and fluxes to determine their effects. The results showed that the NF membrane can remove pesticides from 46% to 100% based on their molecular weights, lengths, fluxes and recoveries. The rejections were increased as the molecular weight increased, and a sharp increase to complete rejection (100%) was observed around MW 200 Da. Therefore, a molecular weight cut-off (MWC) of 200 Da can be determined for this membrane from this result. In addition, the results showed the molecular length was more significant than molecular width for these pesticides. The rejections were not only dependent on molecular weight and length, but also on operational flux and recovery. For a particular pesticide in the two operational fluxes and recoveries, the highest percent rejections occurred on high flux and low recovery, and lowest percent rejection occurred on low flux and high recovery, which would indicate the basic diffusion control theory.

Journal Title

Desalination

Volume

160

Issue/Number

2

Publication Date

1-1-2004

Document Type

Article

Language

English

First Page

103

Last Page

111

WOS Identifier

WOS:000188736800001

ISSN

0011-9164

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