الفهرس 
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Abstract
The aim of the current research is to treat water from organic pollutant through a simple and cheap preparation of nanomaterials have the ability to photodegrade the organic dyes.
This thesis consists of three main chapters as follows:
Chapter One: contains a general introduction on the subject and a literature review.
Chapter Two: Include materials, instruments, preparations and general procedures, methods of data analysis.
Chapter three: This chapter represents the materials’ characterizations and the results of the study:
1. The CoS-rGO nanocomposites exhibited superior efficiency in the removal of both amaranth and rhodamine B dyes.
2. The CuS-rGO nanocomposites showed an effective role in the removal of both amaranth and rhodamine B dyes.
3. DFT studies unveil the role of superoxide radicals and showed the robust binding distance and large charge transfer between the studied dyes and our composite that confirm the experimental results.
4. The 20%CuS-rGO efficiently removes the amaranth dye after 90 minutes under visible light, while the 10%CuS-rGO fully degrades rhodamine B dye after 60 minutes under visible light.
5. The exceptional reactivity of the nanocomposites in destructing the organic pollutants is ascribed to the positive role of rGO in transferring electrons to CuS conduction band. This electron transportation enhances the separation efficiency of the charge carrier and increases the lifetime for charge carrier production.