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Mn0.5Zn0.5Fe2O4 Nano-material: Hydrothermal Synthesis

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Title: Hydrothermal synthesis and photocatalytic application of Mn0.5Zn0.5Fe2O4 nano-material for degradation of Reactive Blue H5R dye

In the proposed research work Mn0.5Zn0.5Fe2O4 nano material will be synthesized using hydrothermal technique for the degradation of reactive blue H5R dye. The chlorides of manganese, iron and zinc will be used for the synthesis of the Mn0.5Zn0.5Fe2O4 nano material. Then synthesized material will be used in water treatment for the degradation of reactive blue H5R dye through photocatalysis using visible light. The examination of the size of the particles and structural properties of the synthesized material will be carried out by using X-ray diffraction (XRD) technique and the morphology of material will be evaluated by scanning electron microscopy (SEM). Particle or grain size of prepared samples of Mn0.5Zn0.5Fe2O4 nano material will be computed using the Scherer’s formula. The photo-catalytic behavior of Mn0.5Zn0.5Fe2O4 nano material will be investigated by measuring the photo degradation rate of the dye. The stability of the nano-photo catalytic material will also be investigated by the repeated use of Mn0.5Zn0.5Fe2O4.

INTRODUCTION

Synthetic dyes and different chemicals used in textile industries play significant role in environmental pollution. Some of these industrial chemicals and synthetic dyes decompose aerobically and anaerobically resulting in the formation of carcinogenic compounds (Neill et al., 1999). In the past few decades, there has been huge attention between scientists in increasing semiconductor photo-catalysts with great prospective for environmental protection applications like water disinfection (Ullah et al., 2012; Shahid et al., 2013).

Most of the ferrite materials are known to show exciting photocatalytic capabilities for hydrogen or oxygen generation from water upon irradiation with visible light. Such visible light absorption properties, and their proper band edge positions with respect to redox levels essential for water splitting, are desirable for a water splitting photocatalyst to work under sunlight (Dom et al., 2014).

Ferrite materials technology has now extended to a very progressive stage, in which the properties to a large extent are designed and controlled by engineers, to garb the particular function of the device. Because of their outstanding magneto-transport properties the mixed valence ferrites have involved huge scientific attention in the recent years (Ahmed and Bishay 2005). In the beginning works the ferrites were attained by soft chemistry and mechano-synthesis (Millotet al., 2007).

Hydrothermal strategy is a promising synthetic method because of the low process temperature and very easy to manage the particle size. The hydrothermal procedure has several benefits over other growth methods such as the use of simple devices, catalyst-free growth, low cost, large area uniform production, environmental friendliness and less harmful (Aneesh et al., 2007). Moreover, no post-heat behavior is needed for the created nanoparticles, which makes this method extremely suitable as heat treatment might result in particle collection. (Haw et al., 2002)

OBJECTIVE

The objective of present research work is to produce Mn0.5Zn0.5Fe2O4 nano-sized particles by hydrothermal technique specifically for catalysis of reactive blue H5R dye. The structural properties of synthesized nano-photocatalyst will be studied by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Photo-catalytic behavior of the Mn0.5Zn0.5Fe2O4 nanoparticles will be investigated by determining the photo degradation rate of the reactive blue H5R dye under visible light irradiation.

Review of Literature

Rath et al. (1999) synthesized Mn0.65Zn0.35Fe2O4 particles in nanosize (9–12nm) using metal chlorides via hydrothermal precipitation. The characterization was done with TEM, XRD, and VSM. The concentration of chloride ion and pH of precipitate played a vital role in retaining the preliminary stoichiometry of the solution of the nano-material. Whereas at low pH, incomplete precipitation of Mn was observed. Zn loss in the nano-particles at higher pH of precipitation was noted.

Bujoreanu et al. (2000) investigated the structure of manganese ferrite in powder form which was prepared by co-precipitation method using MnO2 and FeSO4.7H2O. The powder material then was co-precipitated and aged at temperatures ranging from 55 to 59 oC, then washed and dried in the air at room temperature. By the addition 15% sodium hydroxide solution in the 2N cation solution the stoichiometric amounts of MnO2, FeSO4.7H2O and H2SO4 were precipitated

Kosak et al. (2004) prepared nanocrystalline MnZn-ferrite with different morphology through single water-in-oil micro-emulsion comprising of n-hexanol, surfactant CTAB and an mixed metal sulfates solution. The mixture was precipitate with sodium hydroxide solution and oxidized with hydrogen peroxide. The prepared nano materials were characterized by using X-ray diffraction (XRD), BET surface analyzer, magnetometry and transmission electron microscope (TEM).

Abdollahi et al. (2004) synthesized various compositions of manganese Mn doped ZnO. using precipitation method. XRD, TEM, SEM, EDX, BET techniques were used for characterization. The band gap measurement was done with UV-visible reflectance. XRD pattern showed no impurity peaks, indicating Mn-related secondary phases. The EDX showed the slightly lower amount of Mn doped on ZnO than the theoretical value and SEM showed that 1% Mn-doped ZnO well ordered morphology, homogeneous distribution of slightly lower particle size and low aggregation.

Vaidyanathan et al. (2004) compared Mn0.9Zn0.1Fe2O4 synhesized through double sintering method and chemical co precipitation method in order to find the magnetic properties. The precipitated ferrites showed altered magnetic properties like magnetization (Ms), coercive field (Hc) and Curie temperature (Tc). The particles were reduced in size as compared to co-precipitated nano-sized particles.

Arulmurugan et al. (2006) prepared by Mn1−xZnxFe2O4 used for ferro-fluid preparation.TG-DTA, XRD, TEM, VSM and Mossbauer spectroscopy was used for description. The ultimate approximated cation contents decided with the initial degree of substitution. The particle size and curie temperature (Tc) reduced with the rise in zinc substitution. The particles with greater zinc concentration, showed ferrimagnetic and super paramagnetic behavior at room temperature.

Yimin et al. (2007) synthesized Mn1-xZnxFe2O4 using metal sulfate in aqueous ammonia. The TEM, XRPD, VSM and TGA were appled to demonstrate the material properties. The classification of the nanoparticles was evaluated and discussed. The effects of the reacting components and preparation methods on the Curie temperature, the magnetization and the size distribution of Mn Zn ferrite nanoparticles.

Hejase et al. (2012) produced hyperthermia inducing agents manganese zinc iron magnetic nanoparticles. The structure was recongnized using scanning electron microscopy, X-ray diffraction, and a superconducting quantum interference device. The curie temperature, saturation magnetization, remnant magnetization, coercive field, and hysteresis were analyzed which showed that adapting the Mn contributed to the modification of properties of the magnetic complex.

Shahid et al. (2013) synthesized high effective ZrFe2O5 nanoparticles using co-precipitation method. By (EDX) the chemical composition of nano-materials were analyzed. (FE-SEM) was used to study the morphology. The structural properties of the produced material were appraised by XRD technique. By evaluating the degradation rate of TBO dye in aqueous solution the photo-catalytic action of ZrFe2O5nano-particles was examined under visible light irradiation in the presence of ZrFe2O5nano-particles. By increasing time of exposure under visible light irradiation a steady decrease in absorption peak was noticed. As after 140 min of contact to visible light the 92% degradation effectiveness was detected. Besides, ZrFe2O5nano-photocatalyst could be recaptured and reprocessed purely. The rate of TOC elimination and TBO was decreased by only 10% and 5% respectively, afterward seven cycles of use, representing the more photo-stability of the synthesized nano-photo-catalyst material.


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