TiO2-coated 2D photonic crystals for reflectometric determination of malachite green
| Autor: | Bhargav R. Patel, Tatsuro Endo, Kenichi Maeno, Hashwin V. S. Ganesh, Kagan Kerman |
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| Rok vydání: | 2019 |
| Předmět: |
Detection limit
Aqueous solution Materials science Quenching (fluorescence) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound chemistry Photocatalysis Degradation (geology) Irradiation Malachite green 0210 nano-technology Absorption (electromagnetic radiation) Nuclear chemistry |
| Zdroj: | Microchimica Acta. 186 |
| ISSN: | 1436-5073 0026-3672 |
| Popis: | A “detect and destroy” strategy is reported for the spectroscopic determination and photocatalytic degradation of Malachite Green (MG) in aqueous solutions. The intensity of the reflection peak maxima from the TiO2-coated 2D-photonic crystal (PhC) at 633 nm wavelength undergoes a gradual decrease with increasing concentrations of MG. The determination of MG was readily achieved in the nanomolar range due to the quenching of the reflection intensity of the peak, measured using a fiber optic probe. The assay works in the 1.0 nM to 10 μM MG concentration range with a detection limit of 1.3 nM. The same TiO2-coated 2D-PhC surface can photocatalytically degrade MG in aqueous solutions under UV irradiation. The photocatalytic degradation in the presence of TiO2-coated 2D-PhC becomes evident as the blue color of MG changes to colorless with increasing irradiation time. The decrease in absorption is detected at 617 nm. It was found that the photocatalytic efficiency of TiO2 was synergistically enhanced in the presence of 2D-PhCs. It is concluded that each component of the TiO2-coated 2D-PhC system plays a key role in the detection and degradation of MG. |
| Databáze: | OpenAIRE |
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