Instituto de Cerámica y Vidrio, CSIC, c/Kelsen 5, Campus de Cantoblanco, Madrid 28049, Spain.
POEMMA-CEMDATIC, ETSI Telecomunicación, (UPM), Av. Complutense 30, Madrid 28040, Spain.
Nanoscale Res Lett. 2014 May 29;9(1):273. doi: 10.1186/1556-276X-9-273. eCollection 2014.
The fabrication of hierarchical anatase microspheres with potential photocatalytic properties eventually comprises a consolidation step in which a high degree of crystalline order is typically achieved through conventional electric heating treatments. This however entails a substantial reduction in the specific surface area and porosity of the powders, with the consequent deterioration in their photocatalytic response. Here, we have tested the employ of microwave heating as an alternative energy-saving sintering method to promote fast crystallization. The results obtained suggest that under the microwave radiation, the TiO2 hierarchical structures can effectively crystallize in a drastically reduced heating time, allowing the specific surface area and the porosity to be kept in the high values required for an improved photocatalytic performance.
具有潜在光催化性能的分级锐钛矿微球的制备最终包括一个固结步骤，其中通过常规的电热处理通常可以实现高度的结晶有序性。然而，这会导致粉末的比表面积和孔隙率大幅降低，从而导致其光催化响应恶化。在这里，我们已经测试了使用微波加热作为替代节能烧结方法来促进快速结晶。结果表明，在微波辐射下，TiO2 分级结构可以在大大缩短的加热时间内有效地结晶，从而使比表面积和孔隙率保持在提高光催化性能所需的高值。
