Research Group in Advanced Oxidation Processes (AdOx), Chemical Systems Engineering Center, Department of Chemical Engineering, Escola Politécnica, University of São Paulo, Av. Prof. Luciano Gualberto, tr. 3, 380, São Paulo, SP, Brazil.
Nuclear and Energy Research Institute (IPEN), Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil.
Chemosphere. 2022 Jan;287(Pt 1):132023. doi: 10.1016/j.chemosphere.2021.132023. Epub 2021 Aug 24.
The photocatalytic activity of TiO nanoparticles (NPs) supported on mesoporous silica SBA-15 (TiO/SBA-15) was evaluated for the photodegradation of sulfadiazine (SDZ), as target contaminant of emerging concern (CEC), using either pure water solutions (PW) or a real secondary urban wastewater (UWW) spiked with SDZ. For this purpose, TiO/SBA-15 samples with 10, 20 and 30% TiO (w/w) were prepared by the sol-gel post synthetic method on pre-formed SBA-15, using titanium (IV) isopropoxide as a precursor. The TiO/SBA-15 materials were characterized by HRTEM, SAXS and XRD, nitrogen adsorption isotherms and UV-vis diffuse reflectance spectroscopy. TiO NPs were shown to be attached onto the external surface, decorating the SBA-15 particles. The TiO/SBA-15 catalysts were active in SDZ photodegradation using the annular FluHelik photoreactor, when irradiated with UVA light. The 30% TiO/SBA-15 sample presented the best performance in optimization tests performed using PW, and it was further used for the tests with UWW. The photocatalytic activity of 30% TiO/SBA-15 was higher (56% SDZ degradation) than that of standard TiO-P25 (32% SDZ degradation) in the removal of SDZ spiked in the UWW ([SDZ] = 2 mg L). The photodegradation of SDZ with 30% TiO/SBA-15 eached 90% for UWW spiked with a lower SDZ concentration ([SDZ] = 40 μg L). Aside of SDZ, a suit of 65 other CECs were also identified in the UWW sample using LC-MS spectrometry. A fast-screening test showed the heterogeneous photocatalytic system was able to remove most of the detected CECs from UWW, by either adsorption and/or photocatalysis.
负载于介孔硅 SBA-15（TiO/SBA-15）上的 TiO 纳米粒子（NPs）的光催化活性，用于光降解磺胺嘧啶（SDZ），作为新兴关注污染物（CEC）的目标污染物，使用纯水溶液（PW）或添加 SDZ 的实际二级城市废水（UWW）。为此，通过溶胶-凝胶后合成法，使用钛（IV）异丙醇盐作为前驱体，在预先形成的 SBA-15 上制备了 TiO 负载量为 10、20 和 30%（w/w）的 TiO/SBA-15 样品。TiO/SBA-15 材料通过高分辨透射电子显微镜（HRTEM）、小角 X 射线散射（SAXS）和 X 射线衍射（XRD）、氮气吸附等温线和紫外可见漫反射光谱进行了表征。TiO NPs 被证明附着在外部表面，修饰 SBA-15 颗粒。当使用 UVA 光辐照时，TiO/SBA-15 催化剂在环形 FluHelik 光反应器中对 SDZ 光降解具有活性。在 PW 中进行优化测试时，30%TiO/SBA-15 样品表现出最佳性能，进一步用于 UWW 测试。在去除 UWW 中添加的 SDZ 时，30%TiO/SBA-15 的光催化活性（56%SDZ 降解）高于标准 TiO-P25（32%SDZ 降解）。当 UWW 中添加的 SDZ 浓度较低（[SDZ]=40μg/L）时，用 30%TiO/SBA-15 进行的 SDZ 光降解达到 90%。除了 SDZ 之外，使用 LC-MS 光谱法还在 UWW 样品中鉴定出 65 种其他 CECs。快速筛选测试表明，多相光催化系统能够通过吸附和/或光催化作用从 UWW 中去除大部分检测到的 CECs。
