COF LZU-1 has the characteristics of a porous structure, a large specific surface area , and good chemical stability. In recent decades, extensive research has been conducted on its use as a nanomaterial for drug loading and separation. Here, we report a new corrosion inhibitor encapsulated nanostructure (LZU-1 @BTA). We synthesized LZU-1 via a hydrothermal method and loaded benzotriazole (BTA) corrosion inhibitor into LZU-1. The results show that loaded BTA can achieve effective pH-responsive release under acidic and alkaline conditions. The amino group present in the LZU-1 molecule can cross-link with epoxy resin , and its compatibility allows for good dispersion in epoxy resin without any further modification. The LZU-1 @BTA modified epoxy coating has shown remarkable anti-corrosion properties and excellent self-healing capabilities, which have been evaluated through various techniques such as potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), local electrochemical impedance spectroscopy (LEIS), scanning Kelvin probe (SKP) and salt spray testing. The high-quality dispersion of LZU-1 @BTA in the resin, the high cross-linking density, and the pH-responsive release of BTA in the epoxy resin are some of the key factors that contribute to the excellent anti-corrosion performance of the epoxy resin composite coating . This research has opened up new possibilities for designing anti-corrosion coatings with significantly better corrosion resistance .
N-rich carbon (C) microspheres loaded with Ni nanoparticle (NiNP) microspheres (Ni@N-doped C) were obtained by calcination of covalent organic framework (COF) LZU-1 with abundant N atoms/Ni 2+ . Lots of NiNPs with the size of 4 nm are arrayed uniformly and firmly into N-doped C microspheres derived from COF LZU-1 based on the strong coordination between N atoms on the wall of well-ordered pores and Ni atoms, which is more beneficial to rapid electron and mass transfer. The synergistic effect from N-doped C microspheres and small-sized NiNPs in Ni@N-doped C enhances catalytic activity of Ni@N-doped C microspheres greatly, which provides feasibility for the construction of non-enzymatic electrochemical sensor. The non-enzymatic electrochemical sensor based on Ni@N-doped C microspheres is applied to the detection of dopamine (DA) and shows good detection results with a low detection limit of 0.009 μM and a wide detection range of 0.027–70 μM. What is more, this DA sensor has good anti-interference, reproducibility, and stability, which provides new idea for the construction of non-enzymatic electrochemical sensor.
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