A Polymer Membrane Containing Fe0 as a Contaminant Barrier

Shimotori, Tsutomu ; Nuxoll, Eric E. ; Cussler, Edward L. ; Arnold, William A.

University of Minnesota

关键词: Copper;    Hydration;    Membranes;    54 Environmental Sciences;    Chromates;   

DOI  :  10.2172/835479
RP-ID  :  EMSP-86800-2003a
RP-ID  :  FG07-02ER63509
RP-ID  :  835479

美国|英语

来源: UNT Digital Library

【 摘 要 】

A polyvinyl alcohol (PVA) membrane containing iron (Fe0) particles was developed and tested as a model barrier for contaminant containment. Carbon tetrachloride, copper (Cu2+), nitrobenzene, 4-nitroacetophenone, and chromate (CrO4 2-) were selected as model contaminants. Compared with a pure PVA membrane, the Fe0/PVA membrane can increase the breakthrough lag time for Cu2+ and carbon tetrachloride by more than 100 fold. The increase in the lag time was smaller for nitrobenzene and 4-nitroacetophenone which stoichiometrically require more iron and for which the PVA membrane has a higher permeability. The effect of Fe0 was even smaller for CrO4 2- because of its slow reaction. Forty-five percent of the iron, based on the content in the dry membrane prior to hydration, was consumed by reaction with Cu2+ and 19% by reaction with carbon tetrachloride. Similarly, 25%, 17%, and 6% of the iron was consumed by nitrobenzene, 4-nitroacetophenone, and CrO4 2-, respectively. These percentages approximately double when the loss of iron during membrane hydration is considered. The permeability of the Fe0/PVA membrane after breakthrough was within a factor of three for that of pure PVA, consistent with theory. These results suggest that polymer membranes with embedded Fe0 have potential as practical contaminant barriers.