Siuzdak K, Sawczak M, Klein M, Nowaczyk G, Jurga S, Cenian A
Center for Plasma and Laser Engineering, The Szewalski Institute of Fluid Flow Machinery, Fiszera 14, 80-231 Gdansk, Poland.
Phys Chem Chem Phys. 2014 Aug 7;16(29):15199-206. doi: 10.1039/c4cp01923g. Epub 2014 Jun 17.
We report on the preparation method of nanocrystalline titanium dioxide modified with platinum by using nanosecond laser ablation in liquid (LAL). Titania in the form of anatase crystals has been prepared in a two-stage process. Initially, irradiation by laser beam of a titanium metal plate fixed in a glass container filled with deionized water was conducted. After that, the ablation process was continued, with the use of a platinum target placed in a freshly obtained titania colloid. In this work, characterization of the obtained nanoparticles, based on spectroscopic techniques--Raman, X-ray photoelectron and UV-vis reflectance spectroscopy--is given. High resolution transmission electron microscopy was used to describe particle morphology. On the basis of photocatalytic studies we observed the rate of degradation process of methylene blue (MB) (a model organic pollution) in the presence of Pt modified titania in comparison to pure TiO2--as a reference case. Physical and chemical mechanisms of the formation of platinum modified titania are also discussed here. Stable colloidal suspensions containing Pt modified titanium dioxide crystalline anatase particles show an almost perfect spherical shape with diameters ranging from 5 to 30 nm. The TiO2 nanoparticles decorated with platinum exhibit much higher (up to 30%) photocatalytic activity towards the degradation of MB under UV illumination than pure titania.
我们报道了利用纳秒级激光液体烧蚀（LAL）制备铂修饰的纳米晶二氧化钛的方法。锐钛矿晶体形式的二氧化钛是通过两步法制备的。首先，对固定在装有去离子水的玻璃容器中的钛金属板进行激光束照射。之后，在新获得的二氧化钛胶体中放置铂靶，继续进行烧蚀过程。在这项工作中，基于光谱技术——拉曼光谱、X射线光电子能谱和紫外-可见反射光谱——对所得纳米颗粒进行了表征。使用高分辨率透射电子显微镜描述颗粒形态。基于光催化研究，我们观察了与纯二氧化钛（作为参考案例）相比，在铂修饰的二氧化钛存在下亚甲基蓝（MB）（一种典型有机污染物）的降解速率。本文还讨论了铂修饰二氧化钛形成的物理和化学机制。含有铂修饰的二氧化钛锐钛矿晶体颗粒的稳定胶体悬浮液呈现出几乎完美的球形，直径范围为5至30纳米。在紫外光照射下，铂修饰的二氧化钛纳米颗粒对MB降解的光催化活性比纯二氧化钛高得多（高达30%）。
