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Resorcinarene Cavitand Polymers for the Remediation of Halomethanes and 1,4-Dioxane

preprint
submitted on 09.07.2019 and posted on 10.07.2019 by Luke Skala, Anna Yang, Max Justin Klemes, Leilei Xiao, William Dichtel

Executive summary: Porous resorcinarene-containing polymers are used to remove halomethane disinfection byproducts and 1,4-dioxane from water.


Disinfection byproducts such as trihalomethanes are some of the most common micropollutants found in drinking water. Trihalomethanes are formed upon chlorination of natural organic matter (NOM) found in many drinking water sources. Municipalities that produce drinking water from surface water sources struggle to remain below regulatory limits for CHCl3 and other trihalomethanes (80 mg L–1 in the United States). Inspired by molecular CHCl3⊂cavitand host-guest complexes, we designed a porous polymer comprised of resorcinarene receptors. These materials show higher affinity for halomethanes than a specialty activated carbon used for trihalomethane removal. The cavitand polymers show similar removal kinetics as activated carbon and have high capacity (49 mg g–1 of CHCl3). Furthermore, these materials maintain their performance in real drinking water and can be thermally regenerated under mild conditions. Cavitand polymers also outperform activated carbon in their adsorption of 1,4-dioxane, which is difficult to remove and contaminates many public water sources. These materials show promise for removing toxic organic micropollutants and further demonstrate the value of using supramolecular chemistry to design novel absorbents for water purification.

Funding

NSF DMR-1644779

NSF DGE-1842165

NSF CHE-1048773

Camille and Henry Dreyfus Postdoctoral Program in Environmental Chemistry

History

Email Address of Submitting Author

wdichtel@northwestern.edu

Institution

Northwestern University

Country

USA

ORCID For Submitting Author

0000-0002-3635-6119

Declaration of Conflict of Interest

Northwestern University has filed patent applications related to this work. W. R. D. owns equity and/or stock options in CycloPure, Inc., which is commercializing related adsorbents.

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