University of Novi Sad, Faculty of Sciences, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia.
Serbian Academy of Sciences and Arts, Institute of Technical Sciences, Knez Mihajlova 35, 11080 Belgrade, Serbia.
Chemosphere. 2018 Apr;196:145-152. doi: 10.1016/j.chemosphere.2017.12.160. Epub 2017 Dec 27.
The surface modification of commercial TiO Hombikat (TiO) using nanoparticles of fullerene C with tetrahydrofuran (THF-nC), as well as fullerenol C(OH) nanoparticles (FNP) was investigated in this study. Characterization of THF-nC, FNP, TiO, TiO/THF-nC, and TiO/FNP was studied by using DES, ELS, TEM, SEM, DRS and BET measurements and their photoactivity has been examined on the mesotrione degradation under simulated sunlight. It was found that FNP in self-assembled nanocomposite TiO/FNP increased negatively charge, as well as catalytic surface of TiO. In addition, TiO/FNP exhibits a shift of band gap energy to lower values compared to TiO and TiO/THF-nC. BET surface area has not showed significant differences among catalysts. Furthermore, it was found that the highest photoactivity was obtained for TiO/FNP system. Besides, influence of different concentrations of electron acceptors (HO and KBrO), as well as scavengers on the kinetics of mesotrione removal in aqueous solution with/without TiO and FNP under simulated sunlight was investigated. Namely, addition of mentioned electron acceptors has resulted in higher mesotrione degradation efficiency compared to O alone. Besides, in the first period substrate degradation probably takes place via hydroxyl radicals and after 60 min of irradiation the reaction mechanism proceeds mainly via holes. The most efficient system for mesotrione degradation and mineralization were TiO/7 mM KBrO and TiO/7 mM KBrO/40 μl FNP, respectively.
本研究探讨了商用 TiO Hombikat（TiO）表面的修饰，使用四氢呋喃（THF-nC）纳米粒子和富勒醇 C（OH）纳米粒子（FNP）对其进行修饰。通过使用 DES、ELS、TEM、SEM、DRS 和 BET 测量对 THF-nC、FNP、TiO、TiO/THF-nC 和 TiO/FNP 进行了表征，并在模拟阳光下研究了它们对 mesotrione 降解的光催化活性。结果发现，自组装纳米复合材料 TiO/FNP 中的 FNP 增加了 TiO 的负电荷和催化表面。此外，TiO/FNP 的带隙能与 TiO 和 TiO/THF-nC 相比向较低值移动。BET 表面积在催化剂之间没有表现出显著差异。此外，发现 TiO/FNP 体系具有最高的光催化活性。此外，还研究了不同浓度的电子受体（HO 和 KBrO）以及在模拟阳光下，在水溶液中加入 TiO 和 FNP 前后对 mesotrione 去除动力学的影响。即在单独添加 O 的情况下，添加所述电子受体可提高 mesotrione 的降解效率。此外，在最初的 60 分钟内，通过羟基自由基进行底物降解，然后在照射 60 分钟后，反应机制主要通过空穴进行。对于 mesotrione 降解和矿化，最有效的体系分别是 TiO/7mM KBrO 和 TiO/7mM KBrO/40μl FNP。
