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dc.contributor.authorBabitha, K B-
dc.contributor.authorWarrier, K G K-
dc.contributor.authorShukla, S-
dc.date.accessioned2016-02-09T11:06:47Z-
dc.date.available2016-02-09T11:06:47Z-
dc.date.issued2013-09-29-
dc.identifier.citationAdvanced Science, Engineering and Medicine 6(2):173-183,Feb 2014en_US
dc.identifier.urihttp://ir.niist.res.in:8080/jspui/handle/123456789/2227-
dc.description.abstractThe removal of an organic synthetic-dye from an aqueous solution via the adsorption and decolorization processes, typically occurring in the dark-condition on the surface of semiconductor-oxides nanotubes-based adsorbents, has been demonstrated for the first time without the use of any external power-source such as the radiation, potential-difference, microwave-generator, and ultrasonicator. “Two-step” and “one-step” dyeremoval methods have been developed by utilizing the hydrothermally processed hydrogen titanate (H2Ti3O7)and anatase-titania (TiO2) nanotubes in combination with the strong oxidizer such as the hydrogen peroxide (H2O2). In the “two-step” dye-removal method, conducted in the dark-condition, the organic synthetic-dye is adsorbed from an aqueous solution on the surface of nanotubes and decolorized in another aqueous solution containing H2O2. In contrast to this, in the “one-step” dye-removal method, the simultaneous dye-adsorption and dye-decomposition (decolorization) take place in the dark-condition on the surface of nanotubes only in one aqueous solution containing H2O2. The comparison shows that the dye-removal rate-capacity in the “onestep”dye-removal method is ∼2–3 times higher relative to that in the “two-step” dye-removal method. In both the methods, the nanotubes recovered after the end of the first dye-removal cycle can be reused as catalyst for the multiple dye-removal cycles operating under the dark-condition. The underlying dye-removal mechanism is termed as “dark-catalysis” in which the presence of both the nanotubes and H2O2 has been shown to be an essential condition for the complete decolorization in the dark-condition. Due to its several benefits, the dark-catalysis mechanism appears to be a commercially viable process compared with the conventional photocatalysis mechanism.en_US
dc.language.isoenen_US
dc.publisherAmerican Scientific Publishersen_US
dc.subjectAdsorption; Hydrogen Titanate; Anatase-Titania; Recycling; Superoxide-Ionsen_US
dc.titleDecolorization of aqueous solution containing Organic Synthetic-Dye via Dark-Catalysis process using hydrothermally synthesized semiconductor-oxides nanotubesen_US
dc.typeArticleen_US
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