Adsorptive removal of aromatic hydrocarbons from water over metal azolate framework-6-derived carbons

Biswa Nath Bhadra, Ji Yoon Song, Su Kyung Lee, Young Kyu Hwang, Sung Hwa Jhung

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63 Scopus citations

Abstract

Metal azolate framework-6 (MAF-6) was pyrolyzed at 1000 °C to yield MOF-derived carbons (MCs). The obtained MCs were used to eliminate aromatic hydrocarbons, including polyaromatic hydrocarbons (PAHs; e.g., naphthalene (NAP), anthracene (ATC), and pyrene (PRN)) and benzene (BZ) from water via adsorption. The adsorption results over the MCs were compared with that of pristine MAF-6 and commercial activated carbon (AC). MC obtained after 24 h (MC-24) exhibited a remarkable adsorption efficiency compared to that of the other MCs (obtained after different durations), MAF-6, and AC. For example, MC-24 led to adsorptions of NAP around 17 and 2.5 times those of pristine MAF-6 and AC, respectively. Or, the maximum adsorption capacities (Q0) of MAF-6, AC and MC-24 for NAP were 14, 104 and 237 mg/g, respectively. Moreover, Q0 values of MC-24 for ATC and PRN were also very high of 284 and 307 mg/g, respectively. Based on the properties of PAHs and the hydrophobicity of MC-24, hydrophobic interaction was suggested as the main mechanism for the adsorption of PAHs and BZ. In addition, MC-24 can be recycled by washing with acetone with little loss in performance. Therefore, MC-24 is recommended as a competitive adsorbent for aromatic hydrocarbon removal from water.

Original languageEnglish
Pages (from-to)1069-1077
Number of pages9
JournalJournal of Hazardous Materials
Volume344
DOIs
StatePublished - 15 Feb 2018

Keywords

  • Adsorption
  • Aromatic hydrocarbons
  • Hydrophobicity
  • MAF-6
  • MOF-derived carbons

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