锐钛矿型TiO_2溶胶的微波法制备及其光催化性能研究

Study of the synthesis of anatase TiO_2 sol via microwave treatment and its photocatalytic performance

以钛酸丁酯为前驱体,经微波处理制备出TiO2溶胶。利用XPS、XRD、TEM、UV-Vis等手段对溶胶进行了表征,并考察了其光催化性能。结果表明,经微波处理4h后,溶胶中TiO2为锐钛矿结构,粒径10nm左右;XPS分析表明溶胶中钛原子是以+4价的形态存在,O元素以O—H与O—Ti两种物相存在,C元素仅修饰在TiO2表面;该溶胶对甲基橙有较强的降解能力,当紫外光光照15min后,甲基橙脱色率达94.7%,经溶胶改性的氟碳涂层在紫外光照24h后,接触角由82°减小到13°,有望在自清洁涂料领域展现巨大的应用前景。

Titania sol was prepared firstly by using Ti（OC4H9）4 as the precursor,then anatase TiO2 sol was synthesized via low temperature microwave processing.The as-prepared sol was characterized by XPS,XRD and UV-Vis and its photocatalytic performance was investigated.The results show that after treating by microwave for 4h,the dried sol exhibits obvious anatase characteristic peak in XRD spectrum;XPS analysis indicates that titanium atoms exist in form of ＋4 and O element exists in two forms,one was O—H the other was O—Ti;the sol has strong photocatalytic ability toward methyl orange under UV illumination.Decoloring efficiency could be up to 94.7% with only 15min of UV source lighting.The fluorine carbon coating was modified by the TiO2 sol,the contact angle with water was reduced from 82 to 13° in the ultraviolet radiation for 24h.Such a sol exhibits immense application potential in self-cleaning coatings.