School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2007, Australia.
School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, NSW 2007, Australia.
Sci Total Environ. 2018 Jan 1;610-611:521-530. doi: 10.1016/j.scitotenv.2017.08.097. Epub 2017 Aug 17.
Gold-modified TiO (Au-TiO) photocatalysts were utilised for the degradation of estrone (E1), a major endocrine disrupting chemical in water and wastewater. Au-TiO catalysts were synthesised by a deposition-precipitation method with gold loadings of 0-8% (wt%). The Au-TiO nanocomposite exhibited superior activity compared to P25 TiO under UVA (λ=365nm), cool white (λ>420nm) and green (λ=523nm) light emitting diodes (LEDs), for treating 1mgl of E1. The 4wt% Au loading was found to produce the best photocatalytic activity with a rate constant of 2.44±0.36h, compared to 0.06±0.01h for P25 TiO, under visible light. In total 4 by-products were identified, one from negative ionization mode (m/z=269) and three from positive ionization mode (m/z=287) during photocatalysis, which were also degraded with time by Au-TiO. For different water matrices, the photodegradation rate of E1 decreased in the order: ultrapure water>synthetic wastewater≈wastewater effluent from membrane bio-reactor. Overall, 4wt% Au-TiO demonstrated superior performance compared to P25 TiO in water and wastewater.
金修饰的 TiO（Au-TiO）光催化剂被用于降解水中和废水中的主要内分泌干扰化学物质雌酮（E1）。Au-TiO 催化剂通过沉积沉淀法合成，金负载量为 0-8%（wt%）。与 P25 TiO 相比，Au-TiO 纳米复合材料在 UVA（λ=365nm）、冷白光（λ>420nm）和绿光（λ=523nm）发光二极管（LED）下处理 1mgl 的 E1 时表现出更高的活性。发现 4wt%的金负载量产生了最佳的光催化活性，其速率常数为 2.44±0.36h，而 P25 TiO 的速率常数为 0.06±0.01h，在可见光下。在光催化过程中，共鉴定出 4 种副产物，其中 1 种来自负离子模式（m/z=269），3 种来自正离子模式（m/z=287），Au-TiO 也随时间降解了这些产物。对于不同的水基质，E1 的光降解速率按以下顺序降低：超纯水>合成废水≈膜生物反应器废水。总的来说，4wt%的 Au-TiO 在水和废水中的性能优于 P25 TiO。
