With they possesses. These advantages cannot be achieved

With the advancement in
nanotechnology, we see the increased interest in the usage of core shell
nanoparticles because of the advantages they possesses. These advantages cannot
be achieved if  components of core shell
nanoparticles are used individually. Core shelled magnetic nanoparticles
represents important branch of nanotechnology and acquire tremendous amount of
application in optical imaging1-3, catalysis4, magnetic resonance imaging2-9,
sensors10, environmental remediation11, biological separation, cancer
treatment12 and drug delivery13. The shell and core materials together
unveil the combined optical14 and optomagnetic properties. Many core shell
nanoparticles have been developed till now, among these ag nanoparticles are efficiently
analysed as they hold unique optical, electrical, catalytic, antibacterial
properties16-17. They are clean, eco-friendly, less expensive and less toxic
in nature14. A range of approaches have been investigated for synthesis of ag
core nanoparticles; the significant examples include chemical reduction14,
laser ablation21, electron irradiation21, transmetalation14, microwave
processing21, photochemical methods21, polyol reduction18 and
electrochemical synthetic methods19-20. There are ample number of ag based
nanoparticles which are synthesized successfully; [email protected]@Ag22, Fe70Co30Ag14,
FePtAg18, [email protected] and ?-Fe2O3Ag14.

Metal oxides are known to have
various groups with different technological and fundamental importance. For the
existing core-shell nanostructures, the core are usually composed of iron oxide
(Fe3O4 or Fe2O3) and iron metal24. Iron oxides exceptionally shows
superparamagnetism, biodegradability and biocompatibility28 that emerges from
finite size and surface effects25-27. Despite having so many potential
abilities they are not an ideal metal. They have drawbacks such as limited
optical properties, low electrical conductivity, large surface area to volume
ratio and low surface charge at neutral pH, due to which biosensing is a difficult
task. When they are dispersed they show low stability and tend to form aggregates
in solvents29. These downsides are resolved using silver coating. Silver
nanostructures possesses unique surface plasmon30, which helps not only to
modify the outer covering of the shell but also to improve the stability of the
nanoparticles31.

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Silver nanoparticles serve as an electrochemical
biosensor, probe and as a substrate to detect different components such as H2O232,
melamine22. These nanomaterials can be extracted easily using an external
magnet. These are focussed here for their catalytic reduction property14. There
are various approaches for synthesis of ag nanoparticles, they include chemical
reduction22,35, impregnation36, deposition14, solvothermal reduction33,
evaporation condensation, photo-reduction34 and surface functionalization. Solvothermal
synthesis is a process in which the reaction occurs in an autoclave which
allows solvents such as ethyl glycol to be heated to temperatures more than its
normal boiling point under high pressure. The temperature acts as a media for
interaction of precursors. Depending upon saturation level of solvents, this
process produces many geometrically different shapes and sizes of nanoparticles37-39.
This technique helps to prepare high quality metal oxide nanocrystals. The novelty
of the present route is that it can be used to produce metastable and stable state
along with silver metal, which is not possible in other synthetic approaches37.

The wastes from textile, photographic and printing
industries are risky to humans and other living species40. They causes
serious damage to water bodies and surrounding environment. There are around 29-32
Organic dyes which are used commonly in industries. A notable fraction of dye
are washed off as effluent from various industries. Among the various
techniques, the degradation of these dyes by sunlight is popular process but
the process is slow in the absence of catalytic assistance41-44. Therefore
the process is appointed with efficient catalyst. Rhodamine B (Rh B) is a harmful
industrial pollutant dye. They are commonly used in textile industries45.
Their removal is utmost important task as they are toxic and carcinogenic in
nature and are nonbiodegradable in wastewater. They are harmful even when
concentration is low44. Rh B are degraded by heterogeneous photolytic method
but the process is very slow. To fasten the degradation best agents such as
silver core – shelled iron nanoparticles are used. This process is based upon
generation of hole pair and electrons which are later used for redox reactions46.
Silver shelled ferrous nanoparticle is one of the best photocatalyst , as they
possesses the characteristics of absorbing visible range light and have a band
gap of 1.1- 2.2eV45. Other than that, ferrites can be easily separated using
external magnets and can be reused. They help in accelerating the
photocatalytic reaction and degrade RhB into simpler molecule which is harmless
to flora, fauna and human beings. In this paper the ag nanoparticles have been
evaluated for the RhB degradation in presence of photons. The degradation
mechanism using the synthesized catalyst are discussed here along with other
properties of the synthesized catalyst.