Efficient removal and sensing of copper(II) ions by alkaline earth metal-based metal–organic frameworks

Chen WU, Kam-Hung LOW, Ka Man Vonika AU

Research output: Contribution to journalArticlespeer-review

6 Citations (Scopus)

Abstract

A class of alkaline earth metal-based metal–organic frameworks (MOFs), namely NDCMOF(Ca) and NDCMOF(Sr), has been synthesized using 2,6-naphthalenedicarboxylic acid (NDC) as the linker. In view of the biocompatibility of the starting materials, these MOFs are expected to be environmentally benign and, in this work, have been employed for the removal of copper(II) ions (Cu²⁺) from aqueous systems. The results showed that the maximum adsorption capacities of NDCMOF(Ca) and NDCMOF(Sr) for Cu²⁺ were 299.4 and 398.4 mg g⁻¹, respectively, which were comparable to those of related MOFs and porous materials. Meanwhile, NDCMOF(Ca) and NDCMOF(Sr) displayed blue luminescence in the solid state at room temperature upon photoexcitation with ultraviolet (UV) light. This emission would be readily quenched after the adsorption of Cu²⁺ ions. Such visible changes in the observed color and emission of the MOFs have rendered them versatile adsorbents and sensors for Cu²⁺ in the aqueous environment. Copyright © 2023 Elsevier Inc.
Original languageEnglish
Article number123936
JournalJournal of Solid State Chemistry
Volume322
Early online date26 Feb 2023
DOIs
Publication statusPublished - Jun 2023

Citation

Wu, C., Low, K.-H., & Au, V. K.-M. (2023). Efficient removal and sensing of copper(II) ions by alkaline earth metal-based metal–organic frameworks. Journal of Solid State Chemistry, 322. Retrieved from https://doi.org/10.1016/j.jssc.2023.123936

Keywords

  • Metal–organic framework
  • Alkaline earth metal
  • Adsorptive removal
  • Heavy metal
  • Copper(II)

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