Fabrication of magnetic mesoporous manganese ferrite nanocomposites as efficient catalyst for degradation of dye pollutants

Abstract

In this study, mesoporous silica encapsulated with magnetic MnFe 2 O 4 nanoparticles is synthesized by a solvothermal method. The synthetic route is feasible and widely applicable. The obtained products have been characterized by an X-ray powder diffraction (XRD) pattern, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM) and nitrogen adsorption-desorption isotherm measurements. The synthesized magnetic mesoporous MnFe 2 O 4 nanoparticles are monodispersed with a mean diameter of 200 nm, and have an obvious mesoporous silica shell of B20 nm. The surface area of magnetic mesoporous MnFe 2 O 4 nanocomposites is 423 m 2 g À1 . The nanoparticles are superparamagnetic in nature at room temperature and can be separated by an external magnetic field. This magnetic mesoporous material is used as a catalyst for the degradation of methyl orange dye. The merits of the effect under different conditions like pH, temperature, light and sonolysis have been evaluated by investigating the degradation of azo dye. The mesoporous MnFe 2 O 4 nanocomposites have effective adsorption of dyes inside the porous network followed by degradation with the central magnetite core and regeneration of the catalyst with the help of a simple magnet for successive uses.

Influence of annealing temperature on structural and magnetic properties of MnFe2O4 nanoparticles

“…They have wide applications, ranging from fundamental research to industrial applications. The possible applications of manganese ferrite nanoparticles are in magnetic storage, as precursors for ferrofl uids, contrast-enhancing agents in magnetic resonance imaging (MRI), effi cient catalyst for degradation of dye pollutants and magnetically guided drug-delivery agents [4][5][6].…”

Effect of precursor concentration on size evolution of iron oxide nanoparticles

“…Iron oxide nanoparticles have been the focus of intense research because of their magnetic properties, 1,2 biocompatibility 3,4 and bright application prospect in catalysis, 5,6 magnetic fluidity, 7 biomedicine 3,8-10 biotechnology, [11][12][13][14] and data storage. 15,16 Various approaches such as coprecipitation, 17 hydrothermal and solvothermal chemistry, 18 polyol synthesis, 19 reverse micelle, 20 sol-gel, 21 and thermal decomposition [22][23][24] techniques have been developed for the synthesis of iron oxide nanoparticles.…”

Spinel Ferrite Mediated Photo‐Fenton Degradation of Phenolic Analogues: A Detailed Study Employing Two Distinct Inorganic Oxidants

“…Table 2 convincingly suggest that the reactions carried out in dark are much less productive than those administered in visible light. The considerable improvement detected was attributed to many phenomena which occur in the presence of light such as [41][42][43] :…”