A red-emitting layer constructed from {Eu ₂ Na(CH ₃ COO) ₂ } chains and 4,4′-(pyridine-2,6-diyl)dibenzolate linkers exhibits luminescent discriminations for three nitrofuran antibiotics and toxic Cr ₂ O ₇ ²⁻ and MnO ₄ ⁻ anions.

A micrometer-sized europium(iii)–organic framework with good dispersibility, excellent thermal and environmental stability, and easy regeneration ability can serve as a dual-responsive luminescent sensor to probe both Cr₂O₇²⁻ and picric acid contaminants in water system.

The peroxidase-like activity of graphitic carbon nitride (g-C₃N₄) is dramatically increased by a small cobalt doping. The cobalt-doped g-C₃N₄ was used for wastewater treatment, exhibiting much higher degradation rate than that of pure g-C₃N₄.

The classification of critical points of charged topological black holes (TBHs) in anti-de Sitter spacetime (AdS) under the Power Maxwell Invariant (PMI)-massive gravity is accomplished within the framework of black hole chemistry (BHC). Considering the grand canonical ensemble (GCE), we show that $$d=4$$d = 4 black hole have only one topological class, whereas $$d\ge 5$$d ≥ 5 black holes belong to two different topology classes. Furthermore, the conventional critical point characterized by negative topological charge coincides with the maximum extreme point of temperature; and the novel critical point featuring opposite topological charge corresponds to the minimum extreme point of temperature. With increasing pressure, new phases emerge at the novel critical point while disappear from the conventional one. Moreover, a atypical van der Waals (vdW) behavior is found in $$d\ge 6$$d ≥ 6 dimensions, and the anomaly disappears at the traditional critical point. In the limit of nonlinearity parameter $$s\rightarrow 1$$s → 1 , different topology classes are only obtained in the GCE and they may not exist within the canonical ensemble. With the absence of electric potential $$\Phi $$Φ , the neutral TBHs share the same topological classification results as the charged TBHs in the GCE of Maxwell-massive gravity.

Porous graphitic carbon layers encapsulating Ni nanoparticles (Ni@C) were prepared by a facile thermolysis of a Ni-containing metal–organic framework, the structure of which were characterized by power X-ray diffraction (XRD), N₂ adsorption–desorption, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) in detail. The resulting Ni@C nanocomposites served as highly efficient and magnetically recyclable catalysts for the hydrogenation of diverse functionalized nitro compounds to the corresponding anilines under relatively milder conditions. The high catalytic performance and the enhanced stability are ascribed to the synergistic effects and electron transfer between the metallic Ni and graphitic carbon as well as the unique encapsulation structure. The achieved success in the MOF-derived Ni@C nanocomposites may pave the way for designing environmentally benign catalytic hydrogenation processes for industrial applications.