A New Steady and Water-insoluble Polytungstate:Synthesis, Structure, Characterizations and Photocatalytic Properties

摘要

Polyoxometalate (POM)-based materials universally have some inherent flaws,including low recovery,metastability,solubility,etc.,which may restrict their practical applications.Modifying the materials with organic-inorganic hybrid complexes is one of the most effective approaches to overcome these deficiencies.Under hydrothermal conditions,a new WellsDawson-type polytungstate modified Cd-complex,[Cd(phen)3]3[W18O54(PO4)2]·3H2O (1,phen =1,10-phenanthroline (C12N2H8)),has been synthesized by selecting Cd2+ coordinated phen and employing stepwise self-assembly plans.The compound shows good stability and waterinsolubility under normal circumstances.Experiments demonstrate that compound 1 has ideal catalytic activity in the degradation reaction of rhodamine B (RhB) under ultraviolet (UV)-light and oxidant H2O2 conditions.Detailed characterizations including X-ray single-crystal diffraction (XRD),Powder X-ray diffraction (PXRD),elemental analysis,energy-dispersive X-ray spectroscopy (EDS) analyses,Fourier transform infrared spectroscopy (FT-IR),UV-Vis-NIR diffuse reflection spectrum (DRS) and XPS spectrum are presented herein.The electrochemical (cyclic voltammetry (CV)) and photocatalytic properties of 1 have also been studied.