Shenzhen Key Laboratory of Industrial Water Conservation and Municipal Wastewater Reclamation Technology, Shenzhen Polytechnic, Guangdong 518055, China.
Shenzhen Key Laboratory of Industrial Water Conservation and Municipal Wastewater Reclamation Technology, Shenzhen Polytechnic, Guangdong 518055, China.
J Environ Sci (China). 2019 May;79:153-160. doi: 10.1016/j.jes.2018.11.020. Epub 2018 Dec 13.
Various methods for shifting the optical response of TiO into the visible (Vis) range have been reported. Herein, we reported the application of a TiO/HO/Vis process and the effects of TiO crystalline structure on the degradation of terbuthylazine. The results indicated that TiO crystalline structure and HO addition had significant effects on terbuthylazine degradation: its degradation rate could be increased from 7% to 70% with HO addition after 180 min of reaction, the synergistic degradation of terbuthylazine by TiO-Fe was substantially accelerated, with the degradation rate reaching up to 100% after 20 min of reaction, and rutile TiO showed better photocatalytic activity and a more obvious synergistic effect than anatase TiO. The addition of free-radical scavengers (tert-butyl alcohol or methanol) inhibited the degradation efficiency of rutile TiO, but had a relatively minor effect on anatase TiO. Fluorescence spectrophotometry analysis indicated that hydroxyl free radicals could be continuously produced when using rutile TiO as the photocatalyst. Degradation of terbuthylazine catalyzed by rutile TiO occurred mainly in solution, but occurred on the particle surface of the photocatalyst when catalyzed by anatase TiO. This study provides new insight into the role of TiO crystalline structure on the degradation of terbuthylazine and its photocatalytic degradation mechanism.
已经有多种方法可以将 TiO 的光响应转移到可见光（Vis）范围内。在此，我们报告了 TiO/HO/Vis 过程的应用以及 TiO 晶体结构对特丁津降解的影响。结果表明，TiO 晶体结构和 HO 的添加对特丁津的降解有显著影响：在反应 180 分钟后，加入 HO 可将其降解率从 7%提高到 70%，TiO-Fe 的协同降解作用明显加快，反应 20 分钟后降解率达到 100%，而锐钛矿 TiO 的光催化活性更好，协同作用更明显。自由基清除剂（叔丁醇或甲醇）的添加抑制了锐钛矿 TiO 的降解效率，但对金红石 TiO 的影响相对较小。荧光分光光度法分析表明，使用锐钛矿 TiO 作为光催化剂时，可以不断产生羟基自由基。特丁津在锐钛矿 TiO 催化下的降解主要发生在溶液中，但在催化剂颗粒表面发生时则需要用到金红石 TiO。本研究为 TiO 晶体结构对特丁津降解及其光催化降解机制的作用提供了新的见解。
