Photodegradation rhodamine

The physical properties of the xanthene type dye stmcture in general have been considered. For example, the aggregation phenomena of xanthene dyes has been reviewed (3), as has then photochemistry (4), electron transfer (5), triplet absorption spectra (6), and photodegradation (7). For the fluoresceins in particular, spectral properties and photochemistry have been reviewed (8), and the photochemistry of rhodamines has been investigated (9). 

Wilhelm, P. and Stephan, D. (2007) Photodegradation of rhodamine B in aqueous solution via Si02 Ti02 nanospheres. Journal of Photochemistry and Photobiology A Chemistry, 185, 19-25. 

Figure 4.5 Photodegradation of rhodamine films (A) uncoated (B) coated with an ORMOSIL coating without UV absorber (C) coated with a UV-protec-tive ORMOSIL coating.6 (Reproduced from ref. 6, with permission.)...

A new hybrid Cu"porphyrin-ZnO system has been recently evaluated as a photocatalyst for the photodegradation of rhodamine B, both under UV-vis and visible light. The system displayed higher photodegradation efficiency than bare ZnO, maintaining the photocatalytic activity over several recycles. This makes Cu°porphyrin-ZnO a promising photocatalyst for future applications. ... 

Zinc 5,10,15,20-tetrakis(4-pyridyl)porphyrin, ZnTPyP, was assembled to form monodimensional supramolecular nanostructures via surfactant-assisted self-assembly (SAS) method, with GO acting as a sheet-Uke surfactant [106]. This SAS-enhanced photocatalytic activity for the photodegradation of Rhodamine B under visible-light irradiation with respect to ZnTPyP nanoassemblies formulated via a conventional SAS, with hexadecyltrimethylammonium bromide used as surfactant. 

Dye Liquid Organic dye in a non-absorbing solvent. Dye circulated from a reservoir to avoid problems from photodegradation and triplet state formation Nitrogen laser Excimer laser Nd YAG laser Depends on dye Stilbene (390 35 nm) Coumarin 102 (460-515 nm) Rhodamine G (570-640 nm) Ring-dye laser—0.1 ps 1 MW... 

Using a sol-gel approach, a solution-based synthesis of nanocrystalline InNb04 has been reported for the first time. Indium acetylacetonate and niobium chloride, in the presence of benzyl alcohol, are used as precursors which react to yield the desired nanoparticles at 200 °C after 24 hr. These nanoparticles have been shown to have enhanced photocatalytic activity compared to the corresponding bulk materials, when the photodegradation of the dye Rhodamine B was tested under visible-light irradiation. 

Polydiacetylenes dissolved in common solvents such as tetrahydrofuran, CHCI3, CH2CI2, CCI4 are bleached very rapidly during UV irradiation due to chain scission [1561, 1824], The loss of effective conjugation causes a decrease of photoconductive properties. The photodegradation is accelerated in the presence of photoinitiators such as 2,2 -azobisisobutronitrile, benzo-phenone, anthraquinone and in the presence of dyes such as methylene blue and rhodamin 6G [1524, 2264],... 

Ardona HAM, Paredes FU, Arellano IHJ, Arco SD (2013) Electrospun PET supported-ionic liquid-stabilized CdS catalyst for the photodegradation of Rhodamine B under visible light. Mater Lett 91 96-99. doi 10.1016/j.matlet.2012.09.069... 

Figure 4J8 Photodegradation of Rhodamine B catalyzed by SPB with Au-Ti02, as observed by UV-vis spectroscopy (Lu et al., 2010).

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