在微波辐照下，负载在活性炭上的 TiO2 产生的羟基自由基（•OH）的确认。
Confirmation of hydroxyl radicals (•OH) generated in the presence of TiO2 supported on AC under microwave irradiation.
机构信息
School of Environmental Science, Liaoning University, Shenyang 110036, China.
School of Environmental Science, Liaoning University, Shenyang 110036, China.
出版信息
J Hazard Mater. 2014 Aug 15;278:152-7. doi: 10.1016/j.jhazmat.2014.05.064. Epub 2014 Jun 2.
In order to study the degradation mechanism of technology of microwave (MW) combined with TiO2 supported on activated carbon (TiO2/AC), the reactive oxygen species (ROS) was explored through oxidation of 1,5-diphenyl carbazide (DPCI) to 1,5-diphenyl carbazone (DPCO). Furthermore, 2,6-di-tert-butyl-4-methylphenol (BHT), Mannitol (MT) and Vitamin C (VC) were used as radical scavengers to confirm the generation of the hydroxyl radicals ((•)OH). In addition, the influence of some parameters such as TiO2 mass ratio content, irradiation time, material dose, DPCI concentration and MW power on the determination of (•)OH were examined. The results showed that the (•)OH could be generated under MW combined with loaded TiO2/AC. Also, anatase TiO2/AC can generate more (•)OH radicals than rutile TiO2/AC under MW irradiation. This work would provide new mechanistic insights on the enhanced degradation effect of organic pollutants in water using the supported TiO2/AC coupled with MW technology.
为了研究微波（MW）与负载在活性炭上的 TiO2（TiO2/AC）联合降解技术的降解机制，通过 1,5-二苯基碳酰肼（DPCI）氧化生成 1,5-二苯基碳酰腙（DPCO）来探究活性氧物质（ROS）。此外，还使用 2,6-二叔丁基-4-甲基苯酚（BHT）、甘露醇（MT）和维生素 C（VC）作为自由基清除剂来确认羟基自由基（（•）OH）的生成。另外，还考察了 TiO2 质量比含量、辐照时间、材料剂量、DPCI 浓度和 MW 功率等一些参数对（•）OH 测定的影响。结果表明，在 MW 联合负载 TiO2/AC 作用下可以生成（•）OH。并且，在 MW 辐照下，锐钛矿 TiO2/AC 比金红石 TiO2/AC 能产生更多的（•）OH 自由基。这项工作将为负载 TiO2/AC 与 MW 技术联用增强水中有机污染物降解效果的增强机制提供新的见解。
Zotero 插件