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

Mithun Sarker, Ji Yoon Song, Sung Hwa Jhung

Research output: Contribution to journalArticlepeer-review

142 Scopus citations

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 [sbnd]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.

Original languageEnglish
Pages (from-to)162-169
Number of pages8
JournalJournal of Hazardous Materials
Volume335
DOIs
StatePublished - 2017

Keywords

  • Adsorption
  • Hydrogen bonding
  • MIL-101(OH)
  • p-Arsanilic acid
  • Phenylarsonic acid

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