Two novel octamolybdate nanoclusters as catalysts for dye degradation by air under room conditions

Abstract

Two novel inorganic-organic hybrid materials, namely, (NH4)2CuMo8O26(C10H8N2)2 (1) and Mo8O26(C10H10N2)2(C10H8N2)·2(H2O) (2) have been synthesized based on β-octamolybdate cluster and 4,4'-bipyridine (4,4'-bpy) ligand under solvothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analyses and characterized by FT-IR, atomic absorption spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA). In addition, microcrystals of 1 were used to synthesize its nanocrystals via an ultrasound-assisted top-down method. The nanocrystals were characterized by scanning electron microscopy (SEM), PXRD and FT-IR analyses. The prepared hybrid materials have been proved to be active heterogeneous catalysts for catalytic wet air oxidation (CWAO) of some dyes under mild conditions. Leaching experiments showed that the catalysts had good stability under the reaction conditions and could be easily recycled and reused after a simple treatment.

Sonochemical Synthesis of a Nanosized Coordination Polymer with Catalytic Activity for Selective Epoxidation of Olefins

“…The Mo center exhibits a six‐coordinated geometry and is surrounded by one N atom from 4,4′‐bpy ligand (Mo−N1, 2.422(3)), one terminal oxygen (Mo−O1, 1.698(3)) and four bridging μ 2 ‐O oxygens (Mo−O3, 2.098(3); Mo−O2, 1.993(3); Mo−O2 i , 1.786(3); Mo−O3 ii , 1.753(3); (symmetry code: (i) 1‐x, −0.5+y, −0.5‐z; (ii) −0.5+x, y, −0.5‐z)). The bond distances are in the range of those reported in the literature …”

“…Sonochemical process has been widely utilized as a facile and economical method to produce nanostructured coordination polymers . In this concept, our research group reported the synthesis of (NH 4 ) 2 CuMo 8 O 26 (4,4′‐bpy) 2 nanosized coordination polymer through an ultrasound‐assisted top‐down method and investigated the enhanced catalytic activity of the polymer in nanoscale …”

Sonochemical preparation of bimetallic (Cu/Mo) oxide nanoparticles as catalysts for dye degradation under mild conditions

“…(NH 4 ) 6 The powder X-ray diffraction (PXRD) patterns were obtained using a Philips PW1800 diffractometer with Cu Kα radiation (λ = 1.5406 Å). FT-IR spectra of the samples were recorded with a Bruker Enquinox 55 spectrometer equipped with a single reflection diamond ATR system.…”

“…In the FT-IR spectrum of nanosized 1, shown in Fig. 6, the peaks at 931-493 cm -1 can be assigned to the ν(Mo=O) and ν(Mo-O-Mo) vibrations [6]. The FT-IR spectrum (Fig.…”

Synthesis and structure of Anderson cluster based organic–inorganic hybrid solid, $$[\{\hbox {Cu}(2\hbox {-}pzc)(\hbox {H}_{2}\hbox {O})_{2}\}_{2}\{\hbox {H}_{7}\hbox {AlMo}_{6}\hbox {O}_{24}\}]\cdot 17\hbox {H}_{2}\hbox {O}$$ [ {

“…However, octamolybdate cluster based solids have been used earlier for dye adsorption 34 and degradation properties. 35,36 The intriguing layer-like structure, porosity and acidic nature of title compound motivated us to use it for dye uptake. Methylene Blue (MB) and Basic Violet 1 (BV1) were tried as both have basic nature.…”