氮铈共掺杂介孔TiO2的制备及在造纸废水处理中的应用

Preparation of N, Ce Co-doping Mesoporous TiO2 and Its Application in Papermaking Wastewater Treatment

以钛酸四正丁酯为前躯体，用聚氧乙烯脂肪醇醚（B喇98）和十六烷基三甲基溴化铵（CTAB）作为复合模板剂，硝酸铈和尿素为掺杂离子给予体，通过改进的溶胶-凝胶法成功地制备了氮铈共掺杂介孔TiO2光催化剂。用X射线衍射（XRD）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）等分析手段对所得产物的结构和光学性能进行了表征。结果表明，所制备材料为锐钛矿晶型，具有7～10nm的均一孔径，掺杂能够阻止TiO2的相转变，提高TiO2介孔结构的热稳定性。当共掺杂催化剂含氮2％、铈2％（物质的量分数）时对造纸废水的光催化降解效果最佳，色度和CODCr的去除率分别达到100％和72％。

On a composite surfactant template （Brij 98 and CTAB）, nitrogen and cerium co-doped mesoporous TiO2 photocatalysts were synthesized by a modified sol-gel process using tetrabutyl titanate as the inorganic precursor, and urea and cerium nitrate as doping ion donors. The samples were characterized by X-ray diffraction （XRD）, fourier transformed infrared spectroscopy （FF-IR） and transmission electron microscopy （TEM）. The results showed that as-prepared materials possessed a anatase phase with a uniform pore size of 7 - 10 nm, while the ions doping could inhibit the phase transformation of TiO： and enhance the thermal stability of TiO2 structure. When the mol ration of N/ Ti and Ce/Ti are 2% and 2%, respectively, the catalyst is endowed with the highest activity, at the same time, the chroma and CODCr removal rates of the wastewater are up to 100% and 72% respectively when the waste water is photocatalysts degraded with the mesoporous TiO2.