Dual functional covalent organic framework/carbon nanotube electrochemical sensor for sensing I− And tandemly derived detection of Hg2+.

[Display omitted] • A highly conductive TT-COF(Zn)/NH 2 -CNTs was designed and synthesized. • TT-COF(Zn)/NH 2 -CNTs represents the first example of COF-based tandem electrochemical sensor for detecting I− and Hg2+. • The developed sensor was successfully applied for the analysis of I− and Hg2+ in real samples. The residues of environmental pollutants have aroused intensive concern in food and agriculture safety. An efficient rapid multifunctional sensor for diverse environmental pollutants based on covalent organic framework (COF) represents the huge development of fancy monitoring technique. In this work, the TT-COF(Zn)/NH 2 -CNTs material was successfully designed and fabricated by hybridization means via one-pot synthesized method and can be modified with GCE to construct an electrochemical sensor for the tandem detection of I− and Hg2+ based on combinatorial principles with high selectivity. The sensor displayed wide detecting range of 0.01–2 mM and 0.01–2 mM, as well as low LOD of 6.82 and 1.20 μM for I− and Hg2+, respectively. Furthermore, practical application results in determining the quantification of I− and Hg2+ was convenient and effective. This work employs the COF as the first example to fabricate an electrochemical tandem sensor using combinatorial principles and represents a promising straightforward strategy to exploit diverse functional sensor. [ABSTRACT FROM AUTHOR]