Products Cited in Publications Worldwide Near-quantitative Removal of Oxalate and Terephthalate from Water by Precipitation with a Rigid Bis-amidinium Compound

Near-quantitative Removal of Oxalate and Terephthalate from Water by Precipitation with a Rigid Bis-amidinium Compound

Rosemary J. Goodwin; Phonlakrit Muang-Non; Nikki A. Tzioumis; Katrina A. Jolliffe; Nicholas G. White

DOI:

Abstract

A simple, readily-prepared precipitant (1·Cl2) precipitates oxalate or terephthalate from water with very high efficacy, removing these anions at sub-millimolar concentrations using only one equivalent of precipitant. A simple aqueous base/acid cycle can be used to regenerate 1·Cl2 after use. The resulting precipitates, 1·oxalate and 1·terephthalate, are anhydrous and closely-packed, with each anion receiving eight charge-assisted hydrogen bonds from amidinium N–H donors. Precipitation of oxalate and terephthalate occurs at much lower concentrations than other dicarboxylates, and direct competition experiments with the biologically/environmentally relevant divalent anions CO3 2–, HPO4 2– and SO4 2– reveal very high selectivity for oxalate or terephthalate over these competitors.

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