Seven new isostructural lanthanide metal-organic frameworks (Ln-MOFs), [Ln(Hpzbc)2(NO3)]·H2O (1-Ln, Ln = Nd(3+), Sm(3+), Eu(3+), Gd(3+), Tb(3+), Er(3+), and Yb(3+) ions, H2pzbc = 3-(1H-pyrazol-3-yl) benzoic acid), with one-dimensional (1D) channels decorated by nitrate anions and pyrazoyl groups have been constructed. 1-Ln, as revealed by structural analysis, represent uncommon microporous 3D Ln-pyrazoyl-carboxyl systems using pyrazoyl-carboxyl bifunctional ligands as bridges. The luminescent investigations show that 1-Eu is an excellent MOF-based fluorescent probe, with high sensitivity, selectivity, and simple regeneration, for environmentally relevant Fe(3+) and Cr2O7(2-) ions. 1-Eu also presents highly selective capture for CO2 over N2 and CH4 due to the multiple binding sites for CO2 molecules, which were supported by Grand Canonical Monte Carlo (GCMC) simulations.

Owing to the rapid increase of Hg­(II) ions in water resources, the design and development of new adsorbents for Hg­(II) removal are becoming a significant challenge in environmental protection. Herein, a thiol-functionalized metal–organic framework (SH-MiL-68­(In)) was successfully prepared through a post-synthesis modification procedure, and the framework intactness and porosity were well maintained after this process. SH-MiL-68­(In) exhibited selective adsorption performance for Hg­(II) ions in water. Meanwhile, SH-MiL-68­(In) also shows a high adsorption capacity (450 mg g–1), large adsorption rate (rate constant k 2 = 1.25 g mg–1 min–1), and good recycling of adsorption capacity toward Hg­(II) ions. The excellent adsorption performance resulted from the strong binding interactions between -SH soft basic groups and Hg­(II) soft acidic ions.

The health-threatening air pollution, especially from particulate matter (PM), has triggered increasing demands for developing low-cost and long-service-life air-cleaning technologies. In the present contribution, a range of high-efficiency textiles/metal–organic framework (MOF) composites (MOFs@textiles) air filters with excellent washable reusability is presented. By processing MOFs onto textile substrates via an eco-friendly solvent-free method to enable the microporous feature and also strong PM adhesion, we develop flexible, highly effective air filters with >95.00% PM removal efficiency (e.g., MiL-53­(Al)@Aramid, PM2.5: 95.30%, PM10: 96.11%) under harmful air quality conditions (average PM2.5 mass concentration > 280 μg m–3 and PM10 > 360 μg m–3). Therefore, these MOFs@textiles are promising composites for producing efficient and recyclable out-/indoor air purifiers.