作者:Cláudia Gomes Silva、Judith Monteiro、Rita R. N. Marques、Adrián M. T. Silva、Cristina Martínez、Moisés Canle L.、Joaquim Luís Faria
DOI:10.1039/c2pp25239b
日期:2013.4
Photochemical and photocatalytic degradation of the emerging pollutant trans-resveratrol has been studied under different irradiation wavelengths and using different TiO2 catalysts. trans-Resveratrol was more easily degraded when irradiated using the whole spectral range (UV-Vis) rather than with UV and near-UV to visible irradiation. The main intermediate of trans-resveratrol phototransformation was identified as its isomer cis-resveratrol. Different TiO2 catalysts were used to carry out the photocatalytic degradation of trans-resveratrol. Catalysts properties such as crystallite dimensions, surface area and presence of hydroxy surface groups are shown to be crucial to the photocatalytic efficiency of the materials tested. From the point of view of trans-resveratrol abatement, the photocatalytic process was more efficient than the pure photochemical one resulting in higher degradation rates and higher organic content removal. Six photoproducts of trans-resveratrol phototransformation were identified mainly resulting from the attack of the hydroxyl radical to the organic molecule.
在不同的照射波长和使用不同的 TiO2 催化剂下,研究了新兴污染物反式白藜芦醇的光化学和光催化降解。当使用整个光谱范围(紫外-可见)而不是紫外和近紫外到可见光照射时,反式白藜芦醇更容易降解。反式白藜芦醇光转化的主要中间体被鉴定为其异构体顺式白藜芦醇。使用不同的TiO2催化剂进行反式白藜芦醇的光催化降解。催化剂的特性,例如晶粒尺寸、表面积和羟基表面基团的存在,对于测试材料的光催化效率至关重要。从反式白藜芦醇消除的角度来看,光催化过程比纯光化学过程更有效,导致更高的降解率和更高的有机物含量去除。鉴定出六种反式白藜芦醇光转化的光产物,主要是由羟基自由基对有机分子的攻击产生的。