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1) Wet chemical synthesis of Fe3O4 nanoparticles with various sizes.

2) Growth of uniform thin layer of CdSe nanoparticles on top of the Fe3O4 nanoparticles through wet chemical route.

3) Growth of uniform thin layer of TiO2 on top of Fe3O4/CdSe heterostructure.

4) Structural, morphological and optical characterization of pure Fe3O4, CdSe coated Fe3O4 and Fe3O4/CdSe/TiO2 heterostructures.

5) Characterizing the magnetic properties of the developed heterostructures.

6) Photodegradation test of various commercially used organic dyes using Fe3O4/CdSe/TiO2 heterostructures.

7) To check the dye degradation efficiency of the photocatalyst in the real waste water collected from atextile industry.

Waste water treatment and its reuse is one of the major challenges in our modern society. The source of waste water ranges from domestic waste water to industrial waste water. Among them textile industry is estimated to discharge more highly polluted water than any other industry. There are more than 10,000 varieties of commercial dyes exist and nearly 7x105 tonnes are produced every year and used in textile industry. 15 percent of these dyes are wasted during its synthetic process that are toxic, carcinogenic and cannot degrade naturally. So it is very essential to eliminate these dyes before released to the environment. One successful effort is to degrade these organic pollutants (dye) through photocatalysis.This project aims to achieve a doubly coated magnetic photocatalyst whose outer layer is made of TiO2 which is well known for its chemical stability and non-toxicity. Middle layer is made of CdSe which does not directly in contact with waste water but endows the TiO2 layer with electron and holes under normal sunlight that is crucial for organic dye degradation. The inner core is made of magnetic nanoparticles for removing the photocatalyst. The fabrication of this photocatalyst is aimed to be achieved using simple wet chemical method.As a result, a highly efficient, cheap and safe photocatalyst for dye degradation in textile industry is assured at the end of this project.

1) A wet chemical method for the synthesis of TiO₂ coated Fe3O4/CdSe heterostructure nanoparticles will be delivered.

2) It will be possible to deliver the nanoparticles with high photocatalytic activity as compared to CdSe:TiO₂ based composites due to the following two reasons: a. IncreasedCdSe/TiO₂heterointerfacial area for the effective photogenerated charge transfer between the nanoparticles. b. Increased spectral response range of the nanoparticles.

3) Since TiO₂ is more chemically stable as compared to CdSe nanoparticles, such coating will help to increase the life of photocatalyst.

4) The inner Fe3O4 core endows the photocatalyst with magnetic property, such that the photocatalyst can be removed completely using magnetic field and can be reused after the waste water treatment.

5) The photocatalytic activity will be efficiently carried out under natural sunlight without any need of UV light.

6) A highly efficient, cheap and safe photocatalyst for dye degradation in textile industry is assured at the end of this project.

7) This project can bring two to three high impact articles. It is anticipated that a patent may come out of this work.

The highly efficient, cheap and safe photocatalyst will be available for dye degradation in textile industry that helps in reducing water pollution and providing clean water.