120th General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code MAT.P-376
Subject Synthesis of UiO-66-Type Metal–Organic Framework with Free Carboxylic Acid: Versatile Adsorbents via H-bond for liquid phase
Authors JiYoon Song, Sung Hwa JHUNG*
Department of Chemistry, Kyungpook National University, Korea
Abstract MOFs with UiO-66 structure were synthesized from terephthalic acid (TPA), isophthalic acid (IPA) and zirconium chloride (ZrCl4) to obtain free carboxylic acid on the MOFs. UiO-66 with free –COOH can be obtained in a facile way by replacing up to 30% of the TPA with IPA. However, the chemical and thermal stability of the synthesized MOFs decreased with increasing IPA content used in the syntheses, suggesting an increase in the population of imperfect bonds in the MOFs because of the asymmetrical structure of IPA. The obtained MOFs with free –COOH were applied in liquid-phase adsorptions from both water and model fuel to not only estimate the potential applications but also confirm the presence of –COOH in the MOFs. The adsorbed amounts of several organics (triclosan and oxybenzone from water; indole and pyrrole from fuel) increased monotonously with increasing IPA content applied in MOF synthesis (or –COOH in the MOFs). The favorable contribution of free –COOH to adsorption can be explained by H-bonding, and the direction of H-bonds was confirmed by adsorption of oxybenzone in a wide pH range. The versatile applications of the MOFs with –COOH in adsorptions from both polar and nonpolar phases are remarkable considering that hydrophobic and hydrophilic adsorbents are generally required for water and fuel purification, respectively. Finally, the presence of free –COOH in the MOFs was confirmed by liquid-phase adsorptions together with general Fourier transform infrared analyses and decreased chemical and thermal stability. In summary, it was confirmed that UiO-66 with free –COOH can be synthesized facilely in one step from inexpensive IPA and TPA, and the obtained MOFs can be used in various adsorptions, especially in the liquid phase.
E-mail sd00201@naver.com