Cu/La共掺杂TiO2光催化氧化水中的氨氮

采用水解-沉淀法制备了Cu/La共掺杂纳米TiO2催化剂,利用XRD、XPS和BET技术对其进行表征,并考察了在紫外灯下,共掺杂TiO2对氨氮的光催化氧化工艺条件。物相结构和比表面积测试结果表明,共掺杂催化剂具有较好的锐钛矿晶型,孔径分布为4～8 nm,Cu/La共掺杂TiO2La以La3+,Cu是以Cu2+、Cu+的形式掺杂进入TiO2的晶格。光催化实验表明:所得改性光催化剂对氨氮的去除及焦化废水的处理均具有较高的催化活性。

Photocatalytic catalytic oxidation of ammonia in aqueous solutions by Cu/La-codoped TiO2

The Cu/La-codoped TiO₂ nanoparticles were prepared by hydrolysis-precipitation method. The nano-TiO₂ was characterized by X-ray diffractometer (XRD), X-ray photoelectron spectra (XPS), and the BET surface areas. The photocatalytic degradation of ammonia in aqueous solutions by doped TiO₂ powders under UV irradiation was studied. Results of structural characterization indicate that the catalyst has the better anatase phase, the pore size rang is 4~8 nm and the incorporation of La as La³⁺ and Cu as Cu²⁺,Cu⁺ exist in Cu/La-codoped TiO₂ nanoparticles. Experimental results show that the treatment of ammonia and coking wastewater exhibit high photocatalytic activity by modified TiO₂ catalyst.