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Preparation and characterization of a phosphonylated polypropylene ion exchanger

โœ Scribed by J. M. Bouknight; P. A. DePalma Jr.; G. P. Cobb; S. W. Shalaby


Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
187 KB
Volume
76
Category
Article
ISSN
0021-8995

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โœฆ Synopsis


Because typical ion exchange resins used for treating wastewater contain sulfur binding sites and suffer from application limitations, a new ion exchange system was developed by phosphonylating nonwoven polypropylene fabric (PP). These fabrics were phosphonylated for 0.5, 1, 2, and 4 h; amount of phosphorus on phosphonylated PP increased with an increase in phosphonylation time. After hydrolysis, the appropriate phosphonylated sample was placed in a glass column where a europium (Eu 3ฯฉ ), lead (Pb 2ฯฉ ), or mercury (Hg 2ฯฉ ) salt solution was passed through the fabrics after an equilibration period of 5 min. Filtrate samples were then analyzed by atomic absorption spectroscopy for metal concentration. Results showed that metal binding efficiency for Eu 3ฯฉ increased with an increase in phosphonylation time; Pb 2ฯฉ binding efficiency increased up to 2 h phosphonylation time and then decreased; Hg 2ฯฉ binding efficiency was practically independent of phosphonylation time. PP fabrics were also sulfonated and tested for binding efficiency to determine if phosphorus was a better binding site than sulfur. By comparing the results from phosphonylated PP and sulfonated PP, data showed that phosphonylated PP bound metal ions at a higher efficiency than sulfonated PP. Also, phosphonylated PP had higher binding efficiencies with Eu 3ฯฉ and Pb 2ฯฉ than a commercial exchange resin.


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