硫、氮共掺杂TiO2纳米棒的合成及其光催化活性

SYNTHESIS AND PHOTOCATALYTIC ACTIVITY OF S, N-CODOPED TiO2 NANORODS

以乙二胺为介质，采用溶剂热法制备S、N共掺杂TiO2纳米棒，并考察其可见光条件下光催化氧化苯酚活性。结果表明，S、N共掺杂TiO2对可见光的吸收优于N掺杂的TiO2。采用溶剂热法合成的S、N共掺杂纳米TiO2为短棒状，略有团聚，直径大约为10～15nm，长度大约为80～120nm。S原子在TiO2中以两种状态存在：一部分S原子以S6＋的形式取代了阳离子Ti4＋的位置；另一部分S原子以S2-的形式取代了TiO2中O原子的位置。N原子部分取代了O原子，进入TiO2晶格中，有效实现了N元素掺杂。在S、N共掺杂TiO2中，S元素和N元素含量存在最佳值。S含量为0．22％、N含量为1．15％时，S、N共掺杂TiO2的苯酚光催化降解性能最好，其降解率为95．2％，TOC转化率为91．0％。

S, N-codoped TiO2 nanorods were synthesized through solvothermal route with the assistance of ethylenediamine, and their photocatalytic activity was evaluated. N,S-codoped TiO2 showed the better absorption for visible light than N doped TiOz. S, N-codoped TiO2 nanorods with a diameter of about 10--15 nm and a length of about 80- 120 nm indicated a little spontaneous agglomeration. XPS showed that S6＋ ions and S2- ions respectively replaced Ti4＋ ions and O2- ions in the lattice of TiO2. Moreover, the O atoms of TiO2 were partially substituted by N atoms. S doping and N doping were competitive in the synthetic process of S, N-codoped TiO2 nanorods. The conversion of phenol reached to 95.2% and the TOC degradation ratio to 91.0% with 0.22% S and 1.15 % N doped TiO2 under the illumination of visible light.