Efforts by Iranian scientists have resulted in synthesizing a nano-structural semi-conductor which increases the speed of photo degradation process treating industrial wastes.
Hamid R. Etedalpour and his team applied a nano-structural semi-conductor as a photocatalyst for degrading pollutant compounds and converting them into environmentally safe inorganic species.
The scientists first synthesized both pure and contaminated samples of cadmium sulfide nanoparticles. This contamination, caused by elements like manganese, nickel and copper, was a part of semi-conductor preparation process.
The nanoparticles were produced through a controlled precipitation process and for tracing them instrumental methods like UV-Vis spectrophotometery, XRD, and TEM-imaging were used.
Also, kinetics and optimum conditions for photo-degradation of two commercial dye compounds, methylene blue and safranin in presence of cadmium sulfide were studied. UV-Vis spectrophotometery was used to determine degradation efficiencies in this step.
The results of this research, which are published in Journal of Acta Chimica Slovenica, volume 52, pages 353-361, 2009, showed that among three elements of copper, nickel and manganese, copper has the highest efficiency as a photocatalyst.
Also, through a supplementary survey upon two selected wastes, parameters for an optimum photo-degradation including amount of photo-catalyst, pH, concentration of pollutants, and degradation time were determined.
Source: en.nano.ir /...