Phosphinic Acid Resin Research Articles

Dual mechanism bifunctional polymers: Phosphinic acid ion-exchange/redox resins and the kinetics of metal-ion complexation

The detailed study of bifunctional phosphinic acid resins has recently been introduced. It has been shown that they operate through the dual mechanism of ion exchange and metal-ion reduction. A key component in the synthesis is the Friedel-Crafts catalyst used for the reaction between PCl 3 and polystyrene. We now find that the order of catalyst activity is AlCl 3 > FeCl 3 > ZnCl 2 > SnCl 4 . Ferric chloride catalysis also operates by an additional redox mechanism which yields a phosphonic acid resin. The extent of loading onto phosphinic and sulfonic acid resins by zinc ions at equilibrium was studied as a function of the anion present both with and without the presence of an excess of sodium ions. Both sets of resins exchange at a comparable rate upon the introduction of macroporosity into the polystyrene support. The influence of the redox process as an additional variable in the phosphinic resin kinetics was studied with silver and mercury(II) nitrate solutions. All of the primary acid sites are oxidized after a 9-hour contact time with Ag(I) ions and a 2-hour contact time with Hg(II) ions. The mercury loading curves and the different behavior of silver, which shows more ion exchange than redox at short times while leaving a residual ion concentration on the resin irrespective of whether all of the primary acid sites have been oxidized or not, can be explained by the termolecular nature of the Ag(I) redox reaction in contrast to the bimolecular nature of the Hg(II) reaction. Studies with other ions show that the minimum metal-ion reduction potential below which no redox occurs with the phosphinic resins is probably between 0.0 and 0.3 V.

Synthesis and characterization of bifunctional phosphinic acid resins

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of bifunctional phosphinic acid resinsSpiro D. Alexandratos, Marc A. Strand, Donna R. Quillen, and Anthony J. WalderCite this: Macromolecules 1985, 18, 5, 829–835Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published inissue 1 May 1985https://doi.org/10.1021/ma00147a001RIGHTS & PERMISSIONSArticle Views324Altmetric-Citations66LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (857 KB) Get e-Alerts Get e-Alerts

Metal ion extraction capability of phosphinic acid resins: comparative study of phosphinic, sulfonic, and carboxylic resins using zinc ions

Pour les resines phosphiniques, le degre d'extraction est determine par le taux initial d'ions zinc a etre absorbe et les sites acides. Le point d'equilibre est independant de la rigidite de la matrice jusqu'a 15% de divinylbenzene. Mecanisme redox et d'echange d'ion: superiorite de ces resines