A novel manganese
metal–organic framework (Mn-MOF) termed
UAEU-50 assembled from a benzenedicarboxylate linker (BDC) and trinuclear
manganese clusters was synthesized and fully characterized using different
spectroscopic and analytic techniques (e.g., X-ray powder diffraction,
UV–vis diffuse reflectance spectroscopy, thermogravimetric
analysis, scanning electron microscopy, and energy-dispersive X-ray
spectroscopy). UAEU-50 adopted a hexagonal layer structure and exhibited
superior thermal stability and robust chemical stability. Photocatalytic
activities of UAEU-50 were investigated using the cycloaddition of
CO
2
to different epoxides, forming cyclic carbonates. Impressively,
UAEU-50 can transform up to 90% photocatalytic CO
2
conversion
to cyclic carbonates in the visible-light region at ambient conditions.
Selective aerobic
oxidation of benzylamine to N,N-benzylidenebenzylamine
was achieved using a bismuth
ellagate (Bi-ellagate) metal–organic framework (MOF) under
simulated visible light irradiation. The bismuth ellagate photocatalyst
was characterized using several spectroscopic techniques: powder X-ray
diffraction (PXRD), diffuse reflectance spectroscopy (DRS), scanning
electron microscopy (SEM), transmission electron microscopy (TEM),
energy-dispersive X-ray spectroscopy (EDX), thermogravimetric analysis
(TGA), Fourier transform infrared spectroscopy (FTIR), and nitrogen
sorption measurements. Product formation was confirmed using 1H-NMR, 13C-NMR, and FTIR. The photocatalytic performance
of Bi-ellagate was studied for the first time, which exhibits a band
gap value of 2.62 eV, endowing it with a high photocatalytic activity
under visible light irradiation. The reaction product, N,N-benzylidenebenzylamine, was selectively obtained
with a high conversion yield of ∼96% under solvent-free conditions
compared to other control experiments. The Bi-ellagate photocatalyst
was recovered and reused four times without any significant loss in
its activity, which provides an eco-friendly, low-cost, recyclable,
and efficient photocatalyst for potential photocatalytic applications.
Mixed matrix membranes (MMMs), possessing high porosity, have received extensive attention for gas sensing applications. However, those with high flexibility and significant sensitivity are rare. In this work, we report on the fabrication of a novel membrane, using Cu3(HHTP)2 MOF (Cu-MOF) embedded in a polymer matrix. A solution comprising a homogenous suspension of poly-vinyl alcohol (PVA) and ionic liquid (IL), and Cu-MOF solid particles, was cast onto a petri dish to obtain a flexible membrane (215 μm in thickness). The sensor membrane (Cu-MOF/PVA/IL), characterized for its structure and morphology, was assessed for its performance in sensing against various test gases. A detection limit of 1 ppm at 23 °C (room temperature) for H2S was achieved, with a response time of 12 s. Moreover, (Cu-MOF/PVA/IL) sensor exhibited excellent repeatability, long-term stability, and selectivity towards H2S gas. The other characteristics of the (Cu-MOF/PVA/IL) sensor include high flexibility, low cost, low-power consumption, and easy fabrication technique, which nominate this sensor as a potential candidate for use in practical industrial applications.
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