Photodegradation mechanisms and kinetics of Eosin-Y in oxic and anoxic conditions

光降解 曙红Y 曙红 缺氧水域 化学 颜料 吸光度 发色团 光化学 降级(电信) 氧气 核化学 光催化 环境化学 染色 色谱法 有机化学 催化作用 计算机科学 病理 电信 医学
作者
Alba Álvarez‐Martín,Stanislav Trashin,Matthias Cuykx,Adrian Covaci,Karolien De Wael,Koen Janssens
出处
期刊:Dyes and Pigments [Elsevier BV]
卷期号:145: 376-384 被引量:62
标识
DOI:10.1016/j.dyepig.2017.06.031
摘要

Lakes based on Eosin-Y are extensively used by 19th century artists. Unfortunately, the identification of these pigments in paintings is a difficult task because Eosin-Y degrades very fast under the influence of light. The characterization of the (photo)degradation products of Eosin-Y can be very useful for the identification of these pigments in historic works of art and related cultural heritage artifacts. Furthermore, knowledge on how different factors influence the discoloration process (e.g. different types of irradiation sources and presence/absence of oxygen) is a valuable tool for preventive conservation. To this aim we performed a study on the photodegradation of Eosin-Y in solution under different illumination and in both oxic and anoxic conditions. The photodegradation of Eosin-Y was monitored by UV-VIS spectrophotometry, LC-QTOFMS and electrochemistry techniques. Results indicated higher degradation rates, by a factor of 20 or higher, under illumination with wavelengths near to the main absorbance band of the red pigment. Two different degradation pathways are observed under the conditions studied. LC-QTOFMS and electrochemistry suggested that in the presence of oxygen the degradation mechanism is an oxidative process where the breakdown of the structure causes the total discoloration. Meanwhile under anoxic conditions, a debromination process takes place while the chromophore, and consequently the color of the molecule in solution, remains essentially intact.
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