We are studying positively charged metal-organic, inorganic and inorganic-organic networks that are covalently extended in one, two or three dimensions. These materials display potential applications based on the extra-framework anions that reside in their pores or interlayer/interchain space. The cationic charge of the host coupled with its intrinsic thermal and chemical stability allows applications not possible for anionic clays and zeolites that can only contain intra-pore cations. This talk will focus on our recent advances in the reversible trapping of waterborne perchlorate. Both the exchange solid and exchange solution are characterized by a variety of techniques to follow the rate of uptake/release. The materials display greater capacity, reversibility and selectivity compared to conventional polymer-based anion exchange resins and hydrotalcites/layered double hydroxides. Resins are single use while our materials may be regenerated for re-use over indefinite cycles. The talk will focus on the structural features of the host crystal and the incoming and outgoing anion that leads to record performance towards perchlorate.

Cationic materials for reversible, selective perchlorate trapping

253rd National Meeting (2017)

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