Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Development of Amino Acid-Modified Metal-Organic Framework for Effective Removal of Hg(II) Heavy Metal Ion

  • Jeong Hyub Ha (Department of Integrated Environmental Systems, Pyeongtaek University)
  • Received : 2025.08.23
  • Accepted : 2025.09.14
  • Published : 2025.10.10
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Abstract

In this study, a UIO-66(COOH)2 metal-organic framework (MOF)(bare MOF, UB) containing free carboxylic acid groups was post-synthetically modified with amino acids, such as iminodiacetic acid and aspartic acid. Bare, iminodiacetic acid-, and aspartic acid-treated MOF materials were characterized using several physicochemical techniques. Single-ion batch adsorption studies of Pb(II) and Hg(II) ions were conducted using pristine, iminodiacetic acid-, and aspartic acid-modified MOFs. The parameters influencing the removal efficiency, such as the initial concentration and contact time, were examined. UB exhibited a higher Pb(II) ion adsorption capacity (261. 87 mg/g) than Hg(II) ions (12.9 mg/g) at an initial concentration of 150 ppm. The Hg(II) removal capacity of a UIO-66(COOH)2 MOF with aspartic acid (UA) increased from 0.2 mg/g (1 ppm) to 93.6 mg/g (150 ppm), whereas the removal capacities obtained for a UIO-66(COOH)2 MOF with iminodiacetic acid (UI) and bare MOF (UB) were 15.2 and 12.9 mg/g, respectively. Based on the fitting results of the isotherm and kinetic data models, it can be inferred that the active -COOH sites do not exhibit significant affinity for Hg(II) ions. Modification with aspartic acid greatly enhanced Hg(II) adsorption owing to a chelation process, in which aspartic acid grafted onto the surface of the MOF formed chelates with Hg(II) ions, whereas modification with iminodiacetic acid was ineffective in enhancing Hg(II) adsorption.

Keywords

Acknowledgement

This study was supported by the Research Fund, 2023, Pyeongtaek University in Korea, and is a part of the "Gyeonggi Regional Innovation System & Education Project (Gyeonggi RISE Project)" supported by the Ministry of Education and Gyeonggi Province.

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