TiO 2 Photocatalyzed Degradation of the Azo Dye Disperse Red 1 in Aqueous Micellar Environments,Photochemistry and Photobiology

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TiO 2 Photocatalyzed Degradation of the Azo Dye Disperse Red 1 in Aqueous Micellar Environments
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2020-07-29 , DOI: 10.1111/php.13298
Eduardo Pino ₁ , Cristian Calderón ₁ , Piero Castro ₂

Affiliation

The photoinduced degradation of the azo dye Disperse Red 1 was studied in a microheterogeneous system comprising titanium oxide (TiO2) and sodium dodecyl sulfate, exposed to UV light. Degussa P25, Anatase and TiO2 synthesized in acidic conditions were supported on raschig rings. The TiO2 photocatalyzed degradation is enhanced in the vicinity of the surfactant critical micelle value. Further increase on the surfactant concentration leads to a loss in photodegradation performance up to values equivalent to that observed without surfactant. Surfactant influence can be explained by two different phenomena taking place. The increasing concentration of surfactant leads to an increase in micellar concentration, inducing the incorporation of the dye to the hydrophobic moiety of the micelles, rendering the hydroxyl radical unable to interact with the dye. Similarly, the increased concentration of micelles at the photocatalyst/water interface might lead to a decrease in the number of active sites on the TiO2 surface able to either generate reactive species and/or interact with de dye molecules. Additives such as H2O2, NaCl, Na2SO4, and Na2CO3 are able to override the influence of the surfactant both positively and negatively, being the final outcome of the influence highly dependent on the crystalline form of the TiO2 photocatalyst.

中文翻译：

TiO 2 在水性胶束环境中光催化降解偶氮染料分散红1

在包含氧化钛 (TiO2) 和十二烷基硫酸钠的微多相体系中，暴露于紫外光下，研究了偶氮染料分散红 1 的光诱导降解。在酸性条件下合成的 Degussa P25、锐钛矿和 TiO2 负载在拉西环上。TiO2 光催化降解在表面活性剂临界胶束值附近增强。表面活性剂浓度的进一步增加导致光降解性能的损失，达到与没有表面活性剂观察到的值相当的值。表面活性剂的影响可以用两种不同的现象来解释。表面活性剂浓度的增加导致胶束浓度的增加，诱导染料掺入胶束的疏水部分，使羟基自由基无法与染料相互作用。类似地，光催化剂/水界面处胶束浓度的增加可能导致 TiO2 表面上能够产生活性物质和/或与脱色分子相互作用的活性位点数量减少。H2O2、NaCl、Na2SO4 和 Na2CO3 等添加剂能够抵消表面活性剂的正面和负面影响，这是高度依赖于 TiO2 光催化剂结晶形式的影响的最终结果。

更新日期：2020-07-29

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