Hollow fiber membranes were made from two different dope solutions by using a dry-jet wet spinning process. One dope solution contains cellulose acetate (CA)/N-methyl-2-pyrrolidone (NMP) with a mass ratio of 20/80 and the other contains polysulfone (PS)/NMP with a mass ratio of 15/85. The hollow fiber membranes were heated in a water bath to investigate the effect of heat treatment. It was found that for the CA membranes, the pore size shrank due to the heat treatment as there was a decrease in permeation and an increase in protein rejection. The most dramatic change for the CA membranes occurred after being heated to 95°C, which resulted in an increase in bovine serum albumin (BSA) rejection to 99% while the permeation decreased to 39 L h-1 m-2 bar-1. This is due to heating above the glass transition temperature (67-68°C) for CA. For the PS membranes, the pore size remained unchanged throughout the two heat treatments as the glass transition temperature is 185°C. The PS membranes did however have a smaller pore size to begin with as is evident by the >99% rejection of BSA. The permeation declined more rapidly for the PS membranes compared to the CA membranes due to the more hydrophobic nature of the polymer.
|Number of pages
|Desalination and Water Treatment
|Published - Nov 2013
Bibliographical noteFunding Information:
The authors would like to acknowledge grant NSF OISE 0832894 that supported the development of the collaboration on hollow fiber membrane research between The National University of Singapore and The University of Toledo. The National University of Singapore is thanked for supplying the spinneret used in this study.
- Cellulose acetate
- Hollow fiber membranes
ASJC Scopus subject areas
- Water Science and Technology
- Ocean Engineering