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Adsorption of organic arsenic acids from water over functionalized metal-organic frameworks.

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      Abstract

      Organic arsenic acids (OAAs) are regarded as water pollutants because of their toxicity and considerable solubility in water. Adsorption of OAAs such as phenylarsonic acid (PAA) and p-arsanilic acid (ASA) from water was investigated over functionalized (with OH groups) metal-organic framework (MOF, MIL-101), as well as over pristine MIL-101 and commercial activated carbon. The highly porous MIL-101 bearing three hydroxyl groups (MIL-101(OH)3) exhibited remarkable PAA and ASA adsorption capacities. Based on the effects of pH on PAA and ASA adsorption, hydrogen bonding was suggested as a plausible mechanism of OAA adsorption. Importantly, OAAs and MIL-101(OH)3 can be viewed as hydrogen-bond acceptors and donors, respectively. Moreover, MIL-101(OH)3 could be regenerated by acidic ethanol treatment, being a promising adsorbent for the removal of PAA and ASA from water.

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      Affiliations
      [1 ] Department of Chemistry, Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
      [2 ] Department of Chemistry, Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea. Electronic address: sung@knu.ac.kr.
      Journal
      J. Hazard. Mater.
      Journal of hazardous materials
      Elsevier BV
      1873-3336
      0304-3894
      Aug 05 2017
      : 335
      28448879 S0304-3894(17)30293-5 10.1016/j.jhazmat.2017.04.044

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