Photodegradation of dye acridine yellow on the surface of mesoporous TiO2, SiO2/TiO2 and SiO2 films: spectroscopic and theoretical studies

Abstract

Electronic spectra and LDI mass spectra changes accompanying photodegradation of acridine yellow (AY) adsorbed on the surface of prepared via templated sol-gel synthesis TiO 2 , SiO 2 , and TiO 2 /SiO 2 mesoporous films have been investigated and the main photodegradation products have been determined. The results of calculations show the adsorption energy of the molecular state of AY to be the greatest for the complex with titania-silica where Lewis acidic sites are present, the smallest one being related to the complex with titania what corresponds to the experimental data. Effectiveness of acridine yellow photodegradation on the surfaces of mesoporous films under UV irradiation increases in a row SiO 2 \ TiO 2 /SiO 2 \ TiO 2 . Electronic and laser desorption/ionization mass spectra and theoretical modeling give evidence that efficient photobleach of AY localized at the surface of anatase films proceeds through the following steps: 1-N-demethylation/deamination; 2-photodimerization; 3-photodegradation.

Multiple dyes applications for fluorescent convertible polymer capsules as macrophages tracking labels

“…In addition to RhB, other dyes have been reported to exhibit blue spectral shifts upon irradiation. These dyes include Rh6G [ 30 ], PyB as an analogue of rhodamine dyes [ 31 ], Fl [ 32 ], AY [ 33 ], AO [ 34 ], and TR [ 35 ]. These dyes were selected for further investigation in this research as promising candidates for the synthesis of photoconvertible labels.…”

Carbon Nitride Nanotube as a Chemical Sensor for Melamine: A Theoretical Study

“…Gauss-Sum program was used to obtain the density of state (DOS) plots [41]. The B3LYP has been demonstrated to be a reliable and commonly used functional in the study of different nanostructures [42][43][44][45][46][47][48][49]. We have defined adsorption energy in the usual way as:…”

Quantum chemical modeling of adsorption complexes of fragment of poly(2 hydroxyethyl methacrylate) on silica surface

“…Тому вирішено спростити задачу, використавши як об'єкт дослідження димер -(ГЕМА) 2 , механізм взаємодії якого з кремнеземною поверхнею може характеризувати взаємодію з поверхнею усього полімерного ланцюга. Як метод дослідження обрано квантовохімічне моделювання, яке служить допоміжним підходом до встановлення будови адсорбційних комплексів органічних сполук на твердих поверхнях [14][15][16][17].…”