Mahu Elvira, Coromelci Cristina Giorgiana, Lutic Doina, Asaftei Iuliean Vasile, Sacarescu Liviu, Harabagiu Valeria, Ignat Maria
Laboratory of Materials Chemistry, Faculty of Chemistry, "Alexandru Ioan Cuza" University of Iasi, 11 Carol I Boulevard, 700506 Iasi, Romania.
Laboratory of Inorganic Polymers, "Petru Poni" Institute of Macromolecular Chemistry, 41 A, Grigore Ghica Vodă Aley, 700487 Iasi, Romania.
Nanomaterials (Basel). 2021 May 11;11(5):1263. doi: 10.3390/nano11051263.
A mesoporous titania structure has been prepared using the ultrasound-assisted sol-gel technique in order to find out a way to tailor its structure. The TiO obtained was compared to the same version of titania but synthesized by a conventional sol-gel method with the objective of understanding the effect of ultrasound in the synthesis process. All synthesis experiments were focused on the preparation of a titania photocatalyst. Thus, the anatase photocatalytic active phase of titania was proven by X-ray diffraction. Additionally, the ultrasonation treatment proved to increase the crystallinity of titania samples, being one of the requirements to having good photocatalytic activity for titania. The influence of surfactant/titania precursor weight ratio on the structural (XRD), textural (N-sorption measurements), morphological (TEM), surface chemistry (FTIR) and optical properties (UVDR) was investigated. It was observed that the crystallite size, specific surface area, band gap energy and even photocatalytic activity was affected by the synergism occurring between cavitation effect and the surfactant/titania precursor weight ratio. The study yielded interesting great results that could be considered for further application of ultrasound to tailor mesoporous titania features via sol-gel soft template synthesis, against conventional sol-gel process.
为了找到一种调整其结构的方法，采用超声辅助溶胶 - 凝胶技术制备了一种介孔二氧化钛结构。将所得的二氧化钛与通过传统溶胶 - 凝胶法合成的相同版本的二氧化钛进行比较，目的是了解超声在合成过程中的作用。所有合成实验都集中在制备二氧化钛光催化剂上。因此，通过X射线衍射证实了二氧化钛的锐钛矿光催化活性相。此外，超声处理被证明可以提高二氧化钛样品的结晶度，这是二氧化钛具有良好光催化活性的要求之一。研究了表面活性剂/二氧化钛前驱体重量比在结构（XRD）、织构（N吸附测量）、形态（TEM）、表面化学（FTIR）和光学性质（UVDR）方面的影响。观察到微晶尺寸、比表面积、带隙能量甚至光催化活性都受到空化效应与表面活性剂/二氧化钛前驱体重量比之间协同作用的影响。该研究产生了有趣的重要结果，这些结果可用于考虑通过溶胶 - 凝胶软模板合成进一步应用超声来调整介孔二氧化钛的特性，以替代传统的溶胶 - 凝胶工艺。
