This work focuses on the design of multifunctional lanthanide MOFs platform for smart sensing of methylmalonic acid (MMA) and anti-counterfeiting applications. The platform enables intuitive detection of MMA in urine to further infer vitamin B12 levels.
The destruction of the ecological environment caused
by human activity
and modern industrial development is so severe that the water environment
has become seriously polluted. Therefore, the exploration of high-efficiency
absorbents has become one of the hot topics to solve this issue. Herein,
a porous metal–organic framework [Cu(L)]·2.5H2O·0.5DMF (1, DMF = N,N-dimethylformamide) was successfully constructed using a rigid N-heterocyclic 5-(4-(1H,3,4-triazol-1-yl)phenyl)isophthalic
acid (H2L) ligand. In particular, its structure includes
the classical paddle-wheel-shaped secondary building units and two
1D channels with diameters of 7.2 and 3.2 Å, respectively. Complex 1 shows great sorption performance for methylene blue (MB)
with a maximum capacity of 589 mg·g–1. The
various influence factors, including the time, dye concentration,
adsorbent dosage, and the pH of the solution, are investigated respectively.
Also, the adsorption process is more in line with the first-order
kinetics and the Langmuir isothermal adsorption model. The strong
electrostatic force and intermolecular forces are primarily responsible
for the remarkable adsorption ability of MB.
This review mainly summarizes the recent progress of MOFs composed of N-heterocyclic carboxylate ligands in gas sorption/separation. This work may help to understand the relationship between the structures of MOFs and gas sorption/separation.
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