Efficient extraction of inorganic selenium from water by a Zr metal–organic framework: investigation of volumetric uptake capacity and binding motifs

doi:10.1039/c8ce00992a

This content will become publicly available on August 7, 2019

Title: Efficient extraction of inorganic selenium from water by a Zr metal–organic framework: investigation of volumetric uptake capacity and binding motifs

Strict monitoring and control of selenium concentrations in freshwater supplies is critical to safeguarding human health and aquatic life. A handful of previously investigated sorbents exhibit noteworthy gravimetric (mg g ^-1) Se uptake capacities; however, often display insufficient volumetric (mg cm ^-3) capacities, thereby requiring large volumes of material for commercial implementation. In this paper, in pursuit of mitigating this material inefficiency, we investigated the selenite (SeO ₃ ^2-) and selenate (SeO ₄ ^2-) affinity of MOF-808, a Zr-based metal–organic framework with a high density of potential Se oxyanion binding sites. MOF-808 recorded exceptional volumetric and gravimetric Se oxyanion capacities of 133 mg g ^-1 (127 mg cm ^-3) and 118 mg g ^-1 (112 mg cm ^-3) for aqueous selenite and selenate, respectively. Single-crystal X-ray diffraction studies revealed that selenite and selenate can bind at the MOF node via two distinct binding motifs, an η ₂μ ₂ motif in which the oxyanion coordinates to two different metal atoms in a single node, and a μ ₂ motif in which the oxyanion interacts with only a single metal atom. Finally and furthermore, powder X-ray diffraction (PXRD) patterns and N ₂ adsorption/desorption isotherms confirm the retention of bulk crystallinity and porositymore »

Authors:

; ; Otake, Ken-ichi ^[1] ; ;

Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
Concordia Univ., Montreal, QC (Canada). Dept. of Chemistry and Biochemistry
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry. Dept. of Chemical and Biological Engineering; King Abdulaziz Univ., Jeddah (Saudi Arabia). Dept. of Chemistry

Publication Date:: 2018-08-07

Grant/Contract Number:: NA0003763; ECCS-1542205

Type:: Accepted Manuscript

Journal Name:: CrystEngComm

Additional Journal Information:: Journal Name: CrystEngComm; Journal ID: ISSN 1466-8033

Publisher:: Royal Society of Chemistry

Research Org:: Northwestern Univ., Evanston, IL (United States)

Sponsoring Org:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

OSTI Identifier:: 1468444


                    Drout, Riki J., Howarth, Ashlee J., Otake, Ken-ichi, Islamoglu, Timur, and Farha, Omar K.. Efficient extraction of inorganic selenium from water by a Zr metal–organic framework: investigation of volumetric uptake capacity and binding motifs.  United States: N. p.,  
        Web.  doi:10.1039/c8ce00992a.

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                    Drout, Riki J., Howarth, Ashlee J., Otake, Ken-ichi, Islamoglu, Timur, & Farha, Omar K.. Efficient extraction of inorganic selenium from water by a Zr metal–organic framework: investigation of volumetric uptake capacity and binding motifs.  United States.  doi:10.1039/c8ce00992a.

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                    Drout, Riki J., Howarth, Ashlee J., Otake, Ken-ichi, Islamoglu, Timur, and Farha, Omar K.. 2018.  
        "Efficient extraction of inorganic selenium from water by a Zr metal–organic framework: investigation of volumetric uptake capacity and binding motifs".  United States.  
        doi:10.1039/c8ce00992a.

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@article{osti_1468444,

  title        = {Efficient extraction of inorganic selenium from water by a Zr metal–organic framework: investigation of volumetric uptake capacity and binding motifs},

  author       = {Drout, Riki J. and Howarth, Ashlee J. and Otake, Ken-ichi and Islamoglu, Timur and Farha, Omar K.},

  abstractNote = {Strict monitoring and control of selenium concentrations in freshwater supplies is critical to safeguarding human health and aquatic life. A handful of previously investigated sorbents exhibit noteworthy gravimetric (mg g-1) Se uptake capacities; however, often display insufficient volumetric (mg cm-3) capacities, thereby requiring large volumes of material for commercial implementation. In this paper, in pursuit of mitigating this material inefficiency, we investigated the selenite (SeO32-) and selenate (SeO42-) affinity of MOF-808, a Zr-based metal–organic framework with a high density of potential Se oxyanion binding sites. MOF-808 recorded exceptional volumetric and gravimetric Se oxyanion capacities of 133 mg g-1 (127 mg cm-3) and 118 mg g-1 (112 mg cm-3) for aqueous selenite and selenate, respectively. Single-crystal X-ray diffraction studies revealed that selenite and selenate can bind at the MOF node via two distinct binding motifs, an η2μ2 motif in which the oxyanion coordinates to two different metal atoms in a single node, and a μ2 motif in which the oxyanion interacts with only a single metal atom. Finally and furthermore, powder X-ray diffraction (PXRD) patterns and N2 adsorption/desorption isotherms confirm the retention of bulk crystallinity and porosity after the uptake of Se oxyanions.},

  doi          = {10.1039/c8ce00992a},

  journal      = {CrystEngComm},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {2018},

  month        = {8}

}

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Free Publicly Accessible Full Text
This content will become publicly available on August 7, 2019
Publisher's Version of Record
10.1039/c8ce00992a
https://doi.org/10.1039/c8ce00992a

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