Thiol functionalized covalent organic framework for highly selective enrichment and detection of mercury by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

Qianqian Sun, Wende Ma, Ouyang Dan, Guorong Li, Yixin Yang, Xi Yan, Hang Su, Zian Lin, Zongwei Cai

Research output: Contribution to journalJournal articlepeer-review

16 Citations (Scopus)

Abstract

A spherical thiol-functionalized covalent organic framework (COF-SH) was designedviaa facile thiol-yne click reaction of a alkynyl-terminated COF and pentaerythritol tetra(3-mercaptopropionate). The COF-SH was explored as a new adsorbent for the selective enrichment of Hg2+. The as-prepared COF-SH exhibited a uniform mesoporous structure, a high abundance of binding sites, and good chemical stability, which endow it with great performance for the adsorption of Hg2+and its corresponding maximum adsorption capacity was up to 617.3 mg g−1. Furthermore, the adsorption behavior of Hg2+on the COF-SH wasin good agreement with the Langmuir and pseudo-second-order models. The influences of adsorbent dosage, pH, selectivity, and reusability of the COF-SH on Hg2+adsorption were also investigated. Besides this, the COF-SH showed high selectivity towards Hg2+even in the presence of a high concentration of K+, Na+, Ca2+, Mg2+and Zn2+metal ions. Using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS), the corresponding limit of detection (LOD) of Hg2+was determined at very low concentrations of 80 pg mL−1(equal to 396 amoL μL−1). In addition, the COF-SH was successfully applied to rapidly enrich and sensitively detect Hg2+in industrial sewage, with recoveries in the range of 101.8-103.4%, demonstrating the promising potential of COF-SH as an effective adsorbent for use in environmental sample pretreatment.

Original languageEnglish
Pages (from-to)2991-2997
Number of pages7
JournalAnalyst
Volume146
Issue number9
Early online date13 Mar 2021
DOIs
Publication statusPublished - 7 May 2021

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

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