119th General Meeting of the KCS

Type Poster Presentation
Area 재료화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code MAT.P-339
Subject Metal–Organic Framework UiO-66 with Free Carboxylic Acid: Versatile Adsorbents for Both Aqueous and Non-aqueous Phase
Authors 송지윤, 정성화*
경북대학교 화학과, Korea
Abstract Zirconium chloride and isophthalic acid (IPA), together with the usual terephthalic acid (TPA), were converted into the metal–organic framework (MOF) UiO-66 in one step. 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 (adsorbates: H donor; MOFs: H acceptor) 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.
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