Environmental Problems Associated With Organic Dyes

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1. INTRODUCTION
Environmental problems related with hazardous wastes and toxic water-pollutants have attracted much attention towards itself. Organic dyes are one of the major groups of pollutants in wastewaters released from textile and other industrial processes.
Photocatalysis is a simple and promising technique for solving various current environmental issues. Semiconductor absorbents offer a great potential for eliminating the organic pollutants present. Semiconductor photocatalysts for example, zinc oxide and titanium oxide have been applied to degradation of contaminants in waste water and air.
On common example,For photocatalysis process, ZnO has also been considered as a suitable alternative for TiO2 due to The band-gap energy of ZnO is similar to TiO2, the most used photocatalytic material, so it hypothetically has the same photocatalytic ability as TiO2 and it exhibits better performance in the degradation of organic dye molecules in acidic as well as basic media.
The doping of Cu in ZnO is expected to modify absorption, and other physical or chemical properties of ZnO also.
Lately,( Co- doping) doping of two types of atoms into semiconductor materials has attracted interest, as it result in a higher photocatalytic activity and special characteristics compared with that of single element doping into semiconductor oxides .
Here, a simple Physical method is developed for the synthesis of Cu doped ZnO nanorods, and their photocatalytic activities with different
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