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A novel method for fast and continuous preparation of superfine titanium dioxide nanoparticles in microfluidic system
Particuology ( IF 4.1 ) Pub Date : 2021-05-12 , DOI: 10.1016/j.partic.2021.04.015
Nan Deng , Yujun Wang , Guangsheng Luo

Previously we had developed a microfluidic system that can be easily fabricated by bending a stainless-steel tube into large circular loops. In this study, a fast and continuous preparation method for superfine TiO2 nanoparticles (TiO2-NPs) was developed for the aforementioned microfluidic system. The proposed method can yield anatase TiO2 in 3.5 min, in contrast to the traditional hydrothermal reaction method, which requires hours or even days. Different reaction conditions, such as reaction temperature (120–200 °C), urea concentration (20–100 g/L), and tube length (5–20 m) were investigated. X-ray diffraction and Brunauer-Emmett-Teller analysis indicate that the as-prepared TiO2-NPs have crystalline sizes of 4.1–5.8 nm and specific surface areas of 250.7–330.7 m2/g. Transmission electron microscopy images show that these TiO2-NPs have an even diameter of approximately 5 nm. Moreover, because of their small crystalline sizes and large specific surface areas, most of these as-prepared TiO2-NPs exhibit considerably better absorption and photocatalytic performance with methylene blue than commercial P5 TiO2 does.



中文翻译:

微流控系统快速连续制备超细二氧化钛纳米粒子的新方法

以前,我们已经开发出一种微流体系统,可以通过将不锈钢管弯曲成大的圆形环来轻松地制造该系统。在这项研究中,为上述微流体系统开发了一种快速,连续的制备超细TiO 2纳米颗粒(TiO 2 -NPs)的方法。与传统的水热反应方法(需要数小时甚至数天)相比,该方法可在3.5分钟内产生锐钛矿型TiO 2 。研究了不同的反应条件,例如反应温度(120–200  °C),尿素浓度(20–100  g / L)和管长(5–20  m)。X射线衍射和Brunauer-Emmett-Teller分析表明,所制备的TiO 2-NPs的晶体大小为4.1–5.8  nm,比表面积为250.7–330.7 m 2 / g。透射电子显微镜图像显示这些TiO 2 -NP具有约 5nm的均匀直径。而且,由于它们的小晶体尺寸和大的比表面积,大多数这样制备的TiO 2 -NP比市售P5 TiO 2表现出明显更好的亚甲基蓝吸收和光催化性能。

更新日期:2021-05-12
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