Xing Guanjie, Zhao Lanxiao, Sun Tao, Su Yiguo, Wang Xiaojing
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021 People's Republic of China.
Springerplus. 2016 Jul 19;5(1):1132. doi: 10.1186/s40064-016-2804-2. eCollection 2016.
In this work, we report on the synthesis of nitrogen doped SrTiO3 nanoparticles with efficient visible light driven photocatalytic activity toward Cr(VI) by the solvothermal method. The samples are carefully characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy and photocatalytic test. It is found that nitrogen doping in SrTiO3 lattice led to an apparent lattice expansion, particle size reduction as well as subsequent increase of Brunner-Emmet-Teller surface area. The visible light absorption edge and intensity can be modulated by nitrogen doping content, which absorption edge extends to about 600 nm. Moreover, nitrogen doping can not only modulate the visible light absorption feature, but also have consequence on the enhancement of charge separation efficiency, which can promote the photocatalytic activity. With well controlled particle size, Brunner-Emmet-Teller surface area, and electronic structure via nitrogen doping, the photocatalytic performance toward Cr(VI) reduction of nitrogen doped SrTiO3 was optimized at initial hexamethylenetetramine content of 2.
在本工作中，我们报道了通过溶剂热法合成具有高效可见光驱动光催化活性、可用于还原Cr(VI)的氮掺杂SrTiO₃纳米颗粒。通过X射线衍射、扫描电子显微镜、透射电子显微镜、紫外-可见漫反射光谱和光催化测试对样品进行了仔细表征。结果发现，SrTiO₃晶格中的氮掺杂导致明显的晶格膨胀、粒径减小以及随后Brunner-Emmet-Teller表面积的增加。可见光吸收边缘和强度可通过氮掺杂含量进行调节，其吸收边缘延伸至约600 nm。此外，氮掺杂不仅可以调节可见光吸收特性，还会对电荷分离效率的提高产生影响，从而促进光催化活性。通过氮掺杂很好地控制了粒径、Brunner-Emmet-Teller表面积和电子结构，在初始六亚甲基四胺含量为2时，优化了氮掺杂SrTiO₃对Cr(VI)还原的光催化性能。
