Feng Huajun, Zhang Min-Hong, Yu Liya E
Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576.
J Nanosci Nanotechnol. 2013 Jul;13(7):4981-9. doi: 10.1166/jnn.2013.7606.
Phosphorus-doped (P-doped) TiO2 catalysts with a stable anatase-brookite biphase structure were successfully synthesized by integrating ultrasonication with phosphorus doping and Pluronic P123 surfactant. The synthesized catalysts were characterized using X-ray diffraction, transmission electron microscopy, nitrogen adsorption-desorption, Fourier transform infrared, and UV-visible diffuse reflectance spectra. Ultrasonication facilitates the appearance of brookite phase. Phosphorus doping was demonstrated an effective strategy to stabilize the anatase-brookite biphase structure and inhibits undesirable grain growth. Triblock copolymer Pluronic P123 used in the reaction facilitates the formation of catalyst particles with mesoporous structure and large surface area and prevents particles from agglomeration. The low band-gap of brookite phase enables the synthesized P-doped TiO2 catalysts outperform commercial P25 TiO2 and N-doped TiO2 in the degradation of methylene blue under both solar light and visible light irradiation.
通过将超声处理与磷掺杂以及普朗尼克P123表面活性剂相结合，成功合成了具有稳定锐钛矿-板钛矿双相结构的磷掺杂（P掺杂）二氧化钛催化剂。使用X射线衍射、透射电子显微镜、氮吸附-解吸、傅里叶变换红外光谱和紫外-可见漫反射光谱对合成的催化剂进行了表征。超声处理有助于板钛矿相的出现。磷掺杂被证明是稳定锐钛矿-板钛矿双相结构并抑制不良晶粒生长的有效策略。反应中使用的三嵌段共聚物普朗尼克P123有助于形成具有介孔结构和大表面积的催化剂颗粒，并防止颗粒团聚。板钛矿相的低带隙使得合成的P掺杂二氧化钛催化剂在太阳光和可见光照射下对亚甲基蓝的降解性能优于市售的P25二氧化钛和N掺杂二氧化钛。
