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-378
Subject Removal of Artificial Sweeteners from Water by Adsorption with Urea or Melamine-functionalized Metal-Organic Frameworks
Authors DONGKYU YOO, Sung Hwa JHUNG*
Department of Chemistry, Kyungpook National University, Korea
Abstract Some N-containing compounds such as urea or melamine was introduced into a highly porous metal-organic framework (MOF), MIL-101, via grafting on open metal sites of the MOF. Adsorptive removal of three artificial sweeteners (ASWs) was studied using the MOFs, with or without modifications (including nitration), and activated carbon (AC). The adsorbed quantities (based on the weight of the adsorbent) of saccharin (SAC) under various conditions decreased in the order urea-MIL-101 > melamine-MIL-101 > MIL-101 > AC > O2N-MIL-101; however, the quantities based on unit surface area are in the order melamine-MIL-101 > urea-MIL-101 > MIL-101 > O2N-MIL-101. Similar ASWs [acesulfame (ACE) and cyclamate (CYC)] showed the same tendency. The mechanism for very favorable adsorption of SAC, ACE, and CYC over urea- and melamine-MIL-101 could be explained by H-bonding on the basis of the contents of –NH2 groups on the MOFs and the adsorption results under a wide range of pH values. Moreover, the direction of H-bonding could be clearly defined (H acceptor: ASWs; H donor: MOFs). Based on their high adsorption capacity (for example, urea-MIL-101 had 2.3 times the SAC adsorption of AC) and ready regeneration, urea-MIL-101 and melamine-MIL-101 could be suggested as competitive adsorbents for removal of organic contaminants (such as ASWs) with electronegative atoms.
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