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Abstract
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Contamination of water resources is one of the most important problems in the world today. With
the increasing expansion of industries, significant amounts of pollutants, including
pharmaceutical compositions, agricultural pesticides and organic dyes into water resources are.
Textile dyes are an important source of environmental pollution. These dyes not only are
important colors to water sources but also damages living organisms by blocking sunlight,
stopping photosynthesis and therefore disturbing the aquatic life. Conventional biological and
physical methods do not degrade this type of pollutants as environmental standards, but chemical
methods such as advanced oxidation process in recent years become increasingly desirable. One
of the processes used to remove pollutants resistant to biological oxidation is photocatalytic
process. By using semiconductors such as TiO2 , ZnO , ZnS and CdS in the presence of UV
organic pollutants and convert them to CO2 and H2O. In this research work, CdS nanoparticles
produced by hydrothermal method and used as photocatalyst for the destruction of Red 43 dye.
To reduce the band gap of energy, CdS doped with some lanthanide cations and evaluated its
effectiveness in removing organic dye. These photocatalysts in visible light are efficient. Because
of the doping efficiency, bandgap of energy decreases and reaches into visible light and ultraviolet
light is not needed. By using a hydrothermal method, doped CdS with some lanthanide cations
synthesized under conditions of various time and temperature and identified by means of XRD,
SEM, EDX
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