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In recent years, the environmental production is one
of the most essential objectives of humanity and many approaches are carried
out to achieve this task 1. The waste water originated from pulp, paper, textile
and other industries is contains huge amounts of organic matter with high
chemical stability, low bio-degradability, high color, high absorbable organic
halogenated compounds and toxicity values, which are potentially harmful to the
eco environment 2,3. Among these, photo-catalysis has attracted intense
attention during the past decades because of its potential for utilization of
an abundant and clean energy sources for the purpose of environmental
remediation and clean energy production 1, 4. As a result, the use of
semiconductor metal oxides as photo-catalyst has shown great utility in the
complete mineralization of various environmental pollutants such as dyes,
detergents and volatile organic compounds 5. Over the years, numerous semiconductor
metal oxides namely TiO2, ZnO, WO3, Fe2O3,
MnO2, SnO2, CeO2, V2O5, etc.,
were used as photo catalyst materials for ecological remediation, especially
degradation of organic pollutants in water and air 3, 5. Therefore, it is of
significant practical interest, and there is intensive research effort to
develop novel photo catalyst such as semiconductor materials to improve the
efficiency, in particular under UV, visible, near IR or solar illumination 6.
A photo catalyst is a substance that enhances the reaction rate using light
energy without being altered or consumed at the end. These Semiconductor metal
oxide photo catalyst are photo induced, chemically and biologically neutral,
nontoxic, low cost, and stable in water under different environmental
conditions 2, 7. From the perspective of ecological concern, it is
significant to focus the current research effort in the preparation of Magnesium
oxide (MgO), Copper oxide (Cu2O) and cadmium oxides (CdO) nanoparticles
for the degradation of organic pollutants such as dyes 8. MgO, Cu2O
and CdO nanoparticles are versatile oxide materials with fascinating properties
like wide energy band gap, excellent thermo dynamical stability, low dielectric
constant and low refractive index 8, 9. In addition, it is a well-known
semiconductor metal oxide with unique chemical, mechanical, thermal, optical electrical properties; inexpensiveness
and non-toxicity were recognized
as the main reason for the acceptability of MgO, Cu2O
and CdO materials 10, 11. On the basis of its photo
catalytic properties, the extensive applications of MgO, Cu2O
and CdO such as ceramics, toxic waste
remediation, antibacterial materials,
refractory, paint, fire retardants, electrochemical biosensors, translucent ceramics, plasma display panel, absorbent for
many pollutants and superconductor products 11. Therefore,
several synthetic methods have been engaged to synthesis MgO, Cu2O
and CdO nanoparticles such as Reflection, precipitation, hydrothermal, sol-gel,
surfactant methods, combustion, and micro-emulsion 12. Still, due to the
scalability, feasibility, and low-cost of the precipitation process, this
synthesis route has aroused the interests of many research groups 13.
Accordingly, in the present work we report a simple method to synthesis MgO, Cu2O
and CdO nanoparticles by precipitation method. The photo-catalytic activity of
the synthesized MgO, Cu2O and CdO nanoparticles was evaluated by monitoring the photo-degradation
of MO, MB and RB dyes under sunlight irradiation. The structural,
morphological, optical and photo-catalytic activity of synthesized MgO, Cu2O and CdO
nanoparticles were investigated. 

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