TiO_2纳米片的合成、表征及其光催化性能

Synthesis and characterization of TiO_2 nanopieces and their photocatalytic property

采用水热合成法,以自制TiO2粉体和NaOH为原料,成功制备出TiO2纳米颗粒向纳米管转变的过渡产物TiO2纳米片.用XRD、TEM等分析手段对TiO2纳米片的形貌和晶相结构进行表征.结果表明,形貌上粉体由颗粒状转变为片状,晶相结构由金红石相向锐钛矿相转变,TiO2纳米片的生长机理符合3D—2D的生长模型.光催化实验表明,经650℃煅烧的原料制备出金红石相与锐钛矿相物质量比约为32∶68的TiO2纳米片,催化剂加入量0.75 g/L时,90 min后对甲基橙的光催化降解率为94.2%;TiO2纳米片光催化性能稳定.

TiO2nanopieces, which were the transitive products that TiO2 nanogranules were to be changed into nanotubes, were synthesized successfully with hydrothermal process and by using self-prepared TiO2 powder and NaOH as the precursor. The micro-morphology and crystal phases of TiO2 nanopieces were characterized with XRD and TEM. The results showed that, as for the morphology, the granules changed into pieces and, as for the phase, the futile changed into anatase. The formation mechanism of the pieces were consistent with 3D to 2D growth model. It was shown by photocatalytic experiment that TiO2 nanopieces with the ratio of R/A being about 32 ： 68 were synthesized by using TiO2 powder calcined at 650℃. As the amount of catalyzer addition was 0. 75 g/L, the photocatalytic degradation rate of methylorange solvent was 94.2% after 90 min. The photocatalytic property of TiO2 nanopieces was stable.