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Environmental photochemistry on semiconductor surfaces: photosensitized degradation of a textile azo dye, Acid Orange 7, on TiO2 particles using visible light

Article Abstract:

Photosensitization may be the best approach for the degradation of colored pollutants using visible light. Photosensitized degradation of a textile azo dye, Acid Orange 7, was conducted on TiO2 particles. Degradation does not occur on AI2O3 surface or in the absence of oxygen. Excited dye and TiO2 semiconductor participate in the surface photochemical process as evidenced by the dependence of the dye degradation rate on the surface coverage.

Analysis, Chemistry, Photochemistry, Decomposition (Chemistry), Photosensitizing compounds, Photosensitizing agents, Dyes and dyeing, Dye chemistry

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Enhanced rates of photocatalytic degradation of an azo dye using SnO2 TiO2 coupled semiconductor thin films

Article Abstract:

The use of coupled SnO2 TiO2 semiconductor thin films in the electrochemical degradation of textile dye effluent is investigated. The results showed that the coupled semiconductor thin film significantly enhanced the oxidation efficiency of the photocatalytic semiconductor system. Rapid and complete decolorization of the textile azo dye was achieved due to improved charge separation.

Semiconductors and related devices, Semiconductor Devices, Semiconductor and Related Device Manufacturing, Cyclic crudes and intermediates, Azoic Dyes & Components, Synthetic Organic Dye and Pigment Manufacturing, Thin films, Azo dyes, Azo compounds

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Environmental photochemistry on surfaces: charge injection from excited fulvic acid into semiconductor colloids

Article Abstract:

Research was done at Indiana University Northwest and the University of Notre Dame on the ability of fulvic acid to photosensitize a large band-gap semiconductor. The researchers measured fluorescence emission levels of a solution of fulvic acid in ethanol. The results indicate a direct charge-transfer interaction between the semiconductor and the fulvic acid.

Semiconductors, Fulvic acids, Charge transfer

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