A "concentration-induced self-assembly" strategy for Ag x H3-x PMo12O40 nanorods: synthesis, photoelectric properties and photocatalytic applications

Decomposition-Reassembly Synthesis of a Silverton-Type Polyoxometalate 3D Framework: Semiconducting Properties and Photocatalytic Applications

Polyoxometalate-based all-inorganic three-dimensional (3D) frameworks have recently attracted attention as a unique class of materials due to their unique physicochemical properties and a wide field of application with excellent prospects. We herein synthesized a novel all-inorganic 3D framework material based on cobalt-substituted Silverton-type polyoxometalate, H₆{Co₆W₁₀O₄₂[Co(H₂O)₄]₃}·2H₂O (Co₉W₁₀), which was successfully constructed using Na₁₂[WCo₃^II(H₂O)₂(Co^IIW₉O₃₄)₂]·46-48H₂O (Co₅W₁₉) and Co(NO₃)₂·6H₂O as starting materials in a hydrothermal reaction via a decomposition-reassembly route together with the rational adjustment of pH values. Co₉W₁₀ has been structurally characterized using single-crystal X-ray diffraction. Photocurrent response, band-gap (E_g) value, and the VB-XPS spectrum have been measured to reveal the semiconducting property of Co₉W₁₀. Furthermore, we synthesized x% PTh/Co₉W₁₀ composites (PTh = polythiophene, x = 0.5, 1, 2, 5) for photodegradation of tetracycline hydrochloride (TH) to evaluate the photocatalytic activities of title composites. Due to the optimal molar ratio of hybrids and matching energy levels, 2% PTh/Co₉W₁₀ composites show the best photocatalytic activities among these composites.

Oxidative Degradation of Pharmaceuticals: The Role of Tetrapyrrole-Based Catalysts

Nowadays, society’s widespread consumption of pharmaceutical drugs and the consequent accumulation of such compounds or their metabolites in effluents requires the development of efficient strategies and systems that lead to their effective degradation. This can be done through oxidative processes, in which tetrapyrrolic macrocycles (porphyrins, phthalocyanines) deserve special attention since they are among the most promising degradation catalysts. This paper presents a review of the literature over the past ten years on the major advances made in the development of oxidation processes of pharmaceuticals in aqueous solutions using tetrapyrrole-based catalysts. The review presents a brief discussion of the mechanisms involved in these oxidative processes and is organized by the degradation of families of pharmaceutical compounds, namely antibiotics, analgesics and neurological drugs, among others. For each family, a critical analysis and discussion of the fundamental roles of tetrapyrrolic macrocycles are presented, regarding both photochemical degradative processes and direct oxidative chemical degradation.

Five compounds based on [TeMo6O24]6− and [β-Mo8O26]4− anions synthesized by using different symmetrical and asymmetric N-donor ligands

A series of POM-based compounds can be used as amperometric detectors and the compounds based on [β-Mo₈O₂₆]⁴⁻ can not only detect the cation Cr(vi), but also can photocatalytically reduce Cr(vi).