title: Adsorption and removal of phthalic acid and diethyl phthalate from water with zeolitic imidazolate and metal-organic frameworks.
abstract: ZIF-8 (zinc-methylimidazolate framework-8), one of the zeolitic imidazolate frameworks (ZIFs), has been used for the removal of phthalic acid (H2-PA) and diethyl phthalate (DEP) from aqueous solutions via adsorption. The adsorption capacity of the ZIF-8 for H2-PA was much higher than that of a commercial activated carbon or other typical metal-organic frameworks (MOFs). Because the surface area and pore volume of the adsorbents showed no favorable effect on the adsorption of H2-PA, the remarkable adsorption with ZIF-8 suggests a specific favorable interaction (electrostatic interaction) between the positively charged surface of ZIF-8 and the negatively charged PA anions. In addition, acid-base interactions also have a favorable contribution in the adsorption of H2-PA, based on the adsorptive performances of pristine and amino-functionalized MOFs and adsorption over ZIF-8 at acidic condition (pH=3.5). The reusability of ZIF-8 was also demonstrated after simple washing with methanol. On the other hand, ZIF-8 was not effective in adsorbing DEP probably because of little charge of DEP in a water solution.
authors.affiliation: Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Sankyuck-Dong, Daegu 702-701, Republic of Korea.
authors.forename: Nazmul Abedin
authors.initials: NA
authors.lastname: Khan
authors.affiliation: Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Sankyuck-Dong, Daegu 702-701, Republic of Korea.
authors.forename: Beom K
authors.initials: BK
authors.lastname: Jung
authors.affiliation: Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Sankyuck-Dong, Daegu 702-701, Republic of Korea.
authors.forename: Zubair
authors.initials: Z
authors.lastname: Hasan
authors.affiliation: Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Sankyuck-Dong, Daegu 702-701, Republic of Korea. Electronic address: sung@knu.ac.kr.
authors.forename: Sung Hwa
authors.initials: SH
authors.lastname: Jhung
mesh_terms: D000327:Adsorption; D007093:Imidazoles / Q000737:chemistry*; D010795:Phthalic Acids / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods; D017641:Zeolites / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D007093:Imidazoles; D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; D017641:Zeolites; C032279:phthalic acid; D015032:Zinc; C007379:diethyl phthalate
keywords: Adsorption; Electrostatic interaction; Organic contaminants; Removal; Zeolitic imidazolate framework