What is it about?
We have investigated an application of TiO2 photocatalyst sensitized with meso-tetra (4-carboxyphenyl) porphyrin (H2TPPC) or meso-tetra (4-nitrophenyl) porphyrin (TNO2PP) to degrade acid chrome blue K (ACBK) under visible light irradiation. By injecting electrons from the photoexcited sensitizer to the conduction band, the sensitized TiO2 degraded acid chrome blue K under incandescent lamp irradiation. The results indicated that H2TPPC-TiO2 had remarkable effects on the photodegradation of ACBK under natural sunlight (NSL) irradiation. The initial concentration of ACBK of 10 mg/L gave the decolorization rate of ACBK under incandescent lamp irradiation up to 94% in 15 min. This confirms that the H2TPPC-TiO2 composite could fully decompose ACBK under artificial light and that this process was accelerated under NSL. All facts suggest that H2TPPC-TiO2 in the heterogeneous photocatalysis phase has a potential application in wastewater treatment by using NSL.
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Why is it important?
In this article, the photocatalytic oxidation of H2TPPC-TiO2 or TNO2PP-TiO2 under incandescent lamp irradiation is investigated for the first time. Considerable degradation of ACBK over H2TPPC-TiO2 and TNO2PP-TiO2 is revealed, and the charge-transfer mechanism in H2TPPC-TiO2 and TNO2PP-TiO2 samples is discussed.
Perspectives
The experimental results confirmed that NSL was significantly beneficial to the photodegradation of ACBK solution in the presence of H2TPPC-TiO2, which could provide a potential approach for an energy saving application in wastewater treatment.
Dr Di Li
Read the Original
This page is a summary of: Photocatalytic Degradation of Acid Chrome Blue K with Porphyrin-Sensitized TiO 2 under Visible Light , The Journal of Physical Chemistry C, September 2008, American Chemical Society (ACS),
DOI: 10.1021/jp800318k.
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