Fouad Mohamed, Gar Alalm Mohamed, El-Etriby Hisham Kh, Boffito Daria Camilla, Ookawara Shinichi, Ohno Teruhisa, Fujii Manabu
Department of Public Works Engineering, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt.
Department of Public Works Engineering, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt; Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan.
J Hazard Mater. 2021 Jan 15;402:123514. doi: 10.1016/j.jhazmat.2020.123514. Epub 2020 Jul 17.
We selected ruthenium (Ru) to improve the photocatalytic activity of a WO/ZrO composite. The synthesized Ru/WO/ZrO was then compared to a benchmark photocatalyst (S-TiO) in terms of photocatalytic disinfection of raw surface waters collected from the Nile Delta region, Egypt. The photocatalysts were immobilized on aluminum plates with polysiloxane to test them in repetitive cycles under the irradiation of a metal-halide lamp. Bacterial concentrations in the raw waters ranged from 300 to 5000 CFU/mL (CFU: colony-forming units) and different species and genus were detected including gram-negative (e.g., shigella, salmonella, vibrio parahaemolyticus, and vibrio cholera) and gram-positive bacteria (e.g., enterococcus). Ru/WO/ZrO deactivated over 90 % of the bacterial content within 120 min for most sources, whereas S-TiO did not perform as highly. The bacterial count after 240 min of irradiation was below the detection limit for all different water sources. Moreover, the inhabitation of photocatalytic disinfection by natural organic matter (NOM) was investigated. Ru/WO/ZrO was stable for four continuous cycles (960 min in total), suggesting the viability for practical application.
我们选择钌（Ru）来提高WO/ZrO复合材料的光催化活性。然后，将合成的Ru/WO/ZrO与一种基准光催化剂（S-TiO）就从埃及尼罗河三角洲地区采集的原地表水的光催化消毒效果进行比较。将光催化剂用聚硅氧烷固定在铝板上，以便在金属卤化物灯照射下进行重复循环测试。原水中的细菌浓度范围为300至5000 CFU/mL（CFU：菌落形成单位），检测到不同的物种和属，包括革兰氏阴性菌（如志贺氏菌、沙门氏菌、副溶血性弧菌和霍乱弧菌）和革兰氏阳性菌（如肠球菌）。对于大多数水源，Ru/WO/ZrO在120分钟内使90%以上的细菌失活，而S-TiO的表现则没那么好。照射240分钟后，所有不同水源的细菌计数均低于检测限。此外，还研究了天然有机物（NOM）对光催化消毒的抑制作用。Ru/WO/ZrO在四个连续循环（总共960分钟）中保持稳定，表明其具有实际应用的可行性。
