【摘要】 以钛酸四丁酯和氨水为原料,通过水热法制得层状钛酸铵前驱体,并在400℃下对其进行热分解,制得了N掺杂的锐钛矿TiO2纳米晶。紫外-可见漫反射谱图显示,N掺杂后产物的吸收边红移至550nm左右,禁带宽度减小至2.25eV。结合X射线衍射、X射线光电子能谱、红外光谱及热重分析等表征手段,分析了前驱体的制备和热分解条件、产物的晶型转化和表面结合态及其与光催化活性的关系,探讨了层状钛酸铵的形成条件和N掺杂作用机理。本工作条件下,以氙灯为光源,水中活性艳红X-3B为探针的光催化结果表明,辐射40minX-3B的降解率为99.4%;加装紫外滤光片后,辐射120min降解率为97.8%。更多还原

【Abstract】 N-doped nanocrystal TiO2(anatase) powders were prepared by calcining layered titanate precursor at 400 ℃. The precursor was obtained via one-step hydrothermal reaction using tetrabutyl titanate and ammonia water. UV-Vis diffuse reflectance spectroscopy (DRS) results show that the absorption band of the N-doped products is shifted to 550 nm and the band gap is reduced to 2.25 eV. The sample was characterized by X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), FT-Infrared spectroscopy (FTIR), thermo gravimetric and differential thermal analysis (TG-DTA) for the preparation and thermolysis conditions of the precursor, the crystal phases and surface binding state of products, and their correlations with photocatalytic activity. The formation conditions for layered ammonium titanate and the mechanism for N-doped processes were also discussed. The Xenon-light photocatalytic degradation with liquid X-3B as a probe reaction demonstrates that, after irradiation for 40 min, the removal rate is 99.4%; after irradiation with UV filter for 120 min, the removal rate is 97.8%.更多还原