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|Title:||Environmental remediation of wastewater containing azo dyes with a heterostructured nanophotocatalyst|
Prakash, N Tejo
|Keywords:||Photochemistry;Photocatalyst;Dye degradation;Decolorization;Azo compounds;Wastewater|
|Abstract:||The synthesis, characterization and photocatalytic activity of heterostructured ZnO/TiO2 nanophotocatalyst is reported. The photocatalyst ZnO/TiO2 prepared in molar ratio of 1:9 (ZnO: TiO2) and characterized with X-ray diffraction, SEM-EDX and UV–vis data. The photocatalytic activity has been evaluated using acid orange 7 as a model organic compound. The rate of decolorization has been estimated from residual concentration spectrophotometrically and mineralization rate studied by measuring COD. The results have been compared with TiO2-P25 Degussa. ZnO/TiO2 shows promising photocatalytic activity and 12% higher rate of decolourisation of the dye than that of TiO2 -P25 Degussa. The effect of operational parameters such as pH of reaction medium and concentration of dye on the decolorization rate of AO7 in water has also been investigated. The efficiency of the photocatalyst is maximum at pH 7, an important aspect from the view of its commercial application in waste water treatment technology.|
|Appears in Collections:||IJC-A Vol.50A(07) [July 2011]|
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