Preparation of nano crystalline titanium dioxide by microwave hydrothermal method

摘要

Titanium dioxide (TiO_2) nanoparticles due to their exclusive physical, chemical and electrical properties are widely used as a heterogeneous catalyst and catalytic support in the chemical reactions, a semiconductor for photocatalysis reactions and additives in the membrane processes. The TiO_2 nanoparticles are also utilized in solar cells, gas sensors, pigments and etc. Efficiency of these nanoparticles in various applications is dramatically dependent on their size. Various techniques such as combustion flame synthesis and conventional hydrothermal methods have been used to prepare TiO_2 nanoparticles, but few synthesis techniques can reproducibly produce particles below 10 run. In this study, the TiO_2 nanoparticles in rutile phase were synthesized by microwave assisted hydrothermal method by controlling the crystallization time and temperature. Titanium tetrachloride (TiCl_4) was used as a titanium precursor. The synthesized nanoparticles were characterized by X-ray powder diffraction (XRD) and Scanning Electron Microscope (SEM) analysis. The XRD pattern showed that the rutile phase of the TiO_2 nanoparticles was successfully synthesized by the proposed method with the average crystal size of 4nm. Finally, the prepared Titanium dioxide (TiO_2) nanoparticles were as a hydrophobic additive in the polymeric ultrafiltration membranes in order to reduce the membrane fouling.