Nanostructured v2o5 moo3 vn and crn synthesis characterization and their possible catalytic dyeDegradation magnetic properties

Abstract

newline Nanomaterials with specific morphologies have stimulated great interest due to their significance newlinein fundamental research and potential technological applications. Among them, various newlinenanostructured transition metal oxides and nitrides have been synthesized by using various newlinephysical, chemical, and their combined strategies due to their commercial importance for newlinepotential and practical applications in many fields. This thesis discusses the synthesis, newlinecharacterization, and formation mechanism of the nanostructured V2O5, and#945;-MoO3, VN, and CrN. newlineAlso, their dye degradation and magnetic properties are explored. To obtain one-dimensional newlinenanostructures of V2O5 and and#945;-MoO3, simple hydrothermal techniques were used by employing newlineNH4VO3 and (NH4)6Mo7O24and#8729;4H2O as the starting materials, respectively. Apart from this, VN newlineand CrN nanoparticles were prepared via temperature-programmed nitridation reactions under the newlineflowing NHand#61491; gas. The crystal structure and morphology of the products were characterized by Xray newlinediffraction and electron microscopy techniques. Also, the chemical composition, oxidation newlinestate, and bonding arrangements of elements in the samples were confirmed by the Fourier newlinetransforms infrared, the Raman, and X-ray photoelectron spectroscopic studies. newlineMethylene blue (MB) dye degradation studies were performed using prepared newlinenanocatalysts of V2O5 and and#945;-MoO3 at ambient laboratory conditions. Ultraviolet-visible newlinespectroscopy was employed to monitor dye concentration during the degradation process. V2O5 newlinenanowires show remarkable oxidative catalytic efficiency towards MB dye degradation in which newlinedegradation reactions proceed through an adsorption-oxidation-desorption mechanism. and#945;-MoO3 newlinemicrofibers show MB degradation efficiency in both the dark and light. The overall ~90% newlinecatalytic degradation to initial dye concentration was achieved within 3 h contact time. In newlineaddition, the magnetic properties of nanocrystalline VN and CrN were studied by recording newlinemagnetization as the function of applied magnetic field and t