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In this study, a novel Ni-BTC@Ni3S4 composite was fabricated by solvothermal reaction using an in situ etching vulcanization strategy and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and Brunauer–Emmett–Teller (BET) analyses. The existence of a sulfur vacancy and Ni3+ in the as-prepared vein-like Ni-BTC@Ni3S4 greatly promoted the electrochemical sensing activity of the materials. Herein, a simple electrochemical sensor (Ni-BTC@Ni3S4/CPE) has been fabricated and used for the detection of dopamine (DA). The current signal of the Ni-BTC@Ni3S4/CPE-modified electrode was linear with the concentration of DA in the range of 0.05–750 μM (R 2 = 0.9995) with a sensitivity of 560.27 μA·mM–1·cm–2 and a detection limit of 0.016 μM. At the same time, the sensor has good stability and anti-interference ability. This study could provide a new idea and strategy for the structural regulation of composite electrode-modified materials and sensitive sensing detection of small biological molecules.

Hierarchical IRMOF-3 nanosheets were firstly fabricated by a simple reflux strategy and were then characterized through Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. They revealed a high fluorescence quantum yield (13.2%) and showed excellent selectivity and sensitivity for 2,4,6-trinitrophenol (TNP) over a concentration range of 1-29 μM in aqueous solution. This work demonstrates that the facile fabrication method for hierarchical IRMOF-3 nanosheets with favorable selectivity and sensitivity for TNP could produce a new point of view on novel metal-organic framework nanomaterials for on-line detection of organic pollutants in water.

A nanostructured organic-inorganic framework, hexagonal NH 2 -MIL-88B, has been prepared through a facile one-pot reflux reaction and then it was characterized using various techniques. The as-prepared sample with high specific surface area (414 m 2 g −1 ) showed excellent adsorption for 2,4,6trinitrophenol (TNP) in the liquid phase. Detailed studies of the adsorption kinetics, adsorption mechanism, adsorption isotherm, activation energy and various thermodynamic parameters were conducted. The adsorption mechanism of NH 2 -MIL-88B for TNP may be ascribed to hydrogen bond interaction, and the complexation between ─OH in TNP and unsaturated Fe(III) on the surface of NH 2 -MIL-88B. The maximum adsorption capacity of NH 2 -MIL-88B for TNP based on the Langmuir isotherm was 163.66 mg g −1 . The as-prepared NH 2 -MIL-88B adsorbent seems to be a promising material in practice for TNP removal from aqueous solution.

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