A method is described for obtaining the rate constant of the photodegradation process of fluorophores illuminated by a focused laser beam. The explicit kinetic equations, describing the population dynamics of excited singlet and triplet states, are averaged over the illuminated volume to describe the resulting fluorescence signal. The illumination is modulated at frequencies from 1 Hz to 100 Hz...

Room temperature phosphorescence emission of erythrosin B in sol±gel silica is studied over the oxygen pressure range from 10ÿ6 to 1000 mbar. Quenching by oxygen is signi®cant over the entire range. The Stern±Volmer (SV) intensity data can be very well ®tted using the two-site model. The temperature dependence of the phosphorescence and the delayed ̄uorescence are examined from ÿ173 to 2008C at...

BACKGROUND According to the development of resistant strains of pathogenic bacteria following treatment with antimicrobial chemotherapeutic agents, alternative approaches such as lethal photosensitization are being used. The aim of this study was to evaluate the effect of visible light and laser beam radiation in conjugation with three different photosensitizers on the survival of two main peri...

Hybrid H3PMo12O40/polymer composites were proposed here for the simple photocatalytic decomposition of erythrosine B and rose Bengal because their unwanted effect on environmental microorganism. Interestingly, composite exhibited efficient activity dyes under both mild near UV irradiation solar irradiation. High final conversions obtained reaching 81% 86% respectively after 120 min [email prote...

In this study , Copper oxide as a good and inexpensive adsorbent has been introduced and used for the removal of erythrosine and red carmoisine dyes from several water solutions successfully. The effect of various parameters such as pH, dye concentration, amount of adsorbent, contact time and temperature on removal processing was investigated. Adsorption isothermal data could be interpreted by ...