Radwan Emad K, Langford Cooper H, Achari Gopal
Water Pollution Research Department, National Research Centre, 33 El Bohouth St, Dokki, Giza, Egypt, PO 12622, Egypt.
Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4.
R Soc Open Sci. 2018 Sep 19;5(9):180918. doi: 10.1098/rsos.180918. eCollection 2018 Sep.
Titanium dioxide (Degussa P25) was supported onto two different aluminosilicate zeolites (ZSM-5) and anchored on three silica gels using two separate preparation methods to study the effect of the catalyst components and the preparation method on the photoactivity of composite catalysts. The photoactivity was investigated by tracking phenol disappearance in a batch UVA light-emitting diode reactor. An easily separable photocatalyst with higher photoactivity than commercial Degussa P25 was developed using Degussa P25, ZSM-5 (SiO/AlO = 280) and silica gel (particle size 0.2-0.5 mm and pore size 40 Å). The optimum composition was found to be P25:ZSM-5:silica gel = 0.3 : 0.5 : 0.5 g l. SEM photographs show that the distribution of the composite catalyst components prepared without a binder was better than that prepared with a binder. The efficiency of photocatalytic ozonation of sulfamethoxazole (SMX) using the new photocatalyst was assessed and compared to that of commercially available Degussa P25. It was found that photocatalytic ozonation promoted the SMX disappearance and mineralization. PZS was superior to Degussa P25 with respect to photocatalysis and photocatalytic ozonation. The enhancement was attributed to the synergetic effect between adsorption, ozonation and/or photocatalytic oxidation.
将二氧化钛（德固赛P25）负载到两种不同的硅铝酸盐沸石（ZSM-5）上，并使用两种不同的制备方法固定在三种硅胶上，以研究催化剂组分和制备方法对复合催化剂光活性的影响。通过在间歇式紫外发光二极管反应器中追踪苯酚的消失来研究光活性。使用德固赛P25、ZSM-5（SiO/AlO = 280）和硅胶（粒径0.2 - 0.5 mm，孔径40 Å）开发了一种比市售德固赛P25具有更高光活性且易于分离的光催化剂。发现最佳组成是P25:ZSM-5:硅胶 = 0.3 : 0.5 : 0.5 g l。扫描电子显微镜照片显示，无粘结剂制备的复合催化剂组分的分布优于有粘结剂制备的。评估了使用新型光催化剂对磺胺甲恶唑（SMX）进行光催化臭氧化的效率，并与市售德固赛P25进行了比较。发现光催化臭氧化促进了SMX的消失和矿化。在光催化和光催化臭氧化方面，PZS优于德固赛P25。这种增强归因于吸附、臭氧化和/或光催化氧化之间的协同效应。
