TiO_(2)同质体材料的拓扑转变合成及其性能的研究

Topological Transition Synthesis and Properties of TiO2 Homogeneous Materials

采用H_(4x/3)Ti_(2-x/3)□_(x/3)O_(4)·nH_(2)O(HTO)为前驱体原料,通过水浴浸渍的方式在HTO的表面负载纳米级氧化钛颗粒(ST01),采用焙烧的方法拓扑合成TiO_(2)同质结构复合材料。利用X射线衍射(XRD)、拉曼光谱(Raman)等测试手段,详细研究了焙烧温度对TiO_(2)相变过程的影响。结果表明,HTO随着温度的升高逐渐由单斜结构的TiO_(2)(B)转变成锐钛矿结构,再转变至金红石结构,且形成多种不同结构、组成的TiO_(2)同质复合体材料。以罗丹明B(RhB)为污染物模型进行降解实验,600℃时样品的光催化活性明显高于其他样品,主要是由于此时样品的电子与空穴分离效率较高,说明同质复合体TiO_(2)结构和组成影响了其光催化活性。此外,染料敏化太阳能电池(DSSCs)实验表明,600℃时样品的光电性能较高,其原因是二维片状形貌有助于光生载流子的快速迁移。

In this work,the HTO (H_(4x/3)Ti_(2-x/3)□_(x/3)O_(4)·nH_(2)O) was used as the precursor raw material,and the nanoscale titanium oxide particles(ST01)were loaded on the surface of the HTO by water bath impregnation,and the TiO_(2)homogeneous structure composite was topologically synthesized by calcination method.Using X-ray diffraction(XRD),Raman spectroscopy(Raman)and other testing methods,the effect of calcination temperature on the phase transition process with titanium dioxide was studied in detail.The results indicate that the HTO can transfer to TiO_(2)(B),anatase TiO_(2)and rutile TiO_(2)with increased temperatures,and the TiO_(2)homophase composites are obtained with various structure and content of TiO_(2).The degradation experiment was carried out with Rhodamine B(RhB)as the pollutant model.The photocatalytic activity of the sample at 600℃is significantly higher than that of other samples,mainly because the separation efficiency of electrons and holes of the sample is the highest at this time,indicating that the structure and composition of homogeneous composite TiO_(2)affect its photocatalytic activity.In addition,dyesensitized solar cell(DSSCs)experiments show that the reason for the higher optoelectronic performance of the samples at 600℃is that the two-dimensional sheet-like morphology facilitates the rapid migration of photogenerated carriers.