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

doi:10.1016/j.jhazmat.2017.11.057

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

J Hazard Mater. 2018 Feb 15:344:1069-1077. doi: 10.1016/j.jhazmat.2017.11.057. Epub 2017 Dec 2.

Authors

Biswa Nath Bhadra¹, Ji Yoon Song¹, Su-Kyung Lee², Young Kyu Hwang³, Sung Hwa Jhung⁴

Affiliations

¹ Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, South Korea.
² Research Group for Nanocatalysts, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, South Korea; Department of Chemistry, Korea Advanced of Institute of Science and Technology (KAIST), Daejeon 34141, South Korea.
³ Research Group for Nanocatalysts, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, South Korea; Department of Advanced Materials and Chemical Engineering, University of Science and Technology (UST), 217 Gajeong-Ro, Yuseong, Daejeon 34113, South Korea.
⁴ Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, South Korea. Electronic address: sung@knu.ac.kr.

PMID: 30216966
DOI: 10.1016/j.jhazmat.2017.11.057

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 24h (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 237mg/g, respectively. Moreover, Q₀ values of MC-24 for ATC and PRN were also very high of 284 and 307mg/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.

Keywords: Adsorption; Aromatic hydrocarbons; Hydrophobicity; MAF-6; MOF-derived carbons.

Publication types

Research Support, Non-U.S. Gov't