材料科学
高分辨率透射电子显微镜
光催化
纳米颗粒
化学工程
纳米孔
煅烧
光降解
透射电子显微镜
扫描电子显微镜
水溶液
光致发光
多孔性
锌
纳米技术
催化作用
有机化学
化学
复合材料
工程类
光电子学
冶金
作者
Fen Xu,Peng Zhang,Alexandra Navrotsky,Zhong‐Yong Yuan,Tie Zhen Ren,Matej Halasa,Bao Lian Su
摘要
We show an effective experimental method to prepare hierarchically porous zinc oxide (ZnO) spherical nanoparticles through a self-assembly pathway using surface-modified colloidal ZnO nanocrystallites as the building blocks and P-123 copolymers as the template in aqueous solution. Copolymers are thoroughly removed by Soxhlet extraction with ethanol and calcination at 400 °C. The final products have been characterized by X-ray powder diffraction (XRD) pattern, scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and photoluminescence (PL) spectroscopy. On the basis of calorimetric measurements reported separately, the surface enthalpy (γ) of the hydrated porous ZnO is 1.42 ± 0.21 J/m2, in good agreement with that of ZnO nanoparticles. The calorimetric results support the presence of self-assembled ZnO nanocrystallites in the nanoporous ZnO. Photocatalytic activitiy of porous ZnO nanoparticles has been tested on the photodegradation of phenol under ambient condition, indicating that porous ZnO nanoparticles show superior activity to TiO2 nanoparticles (PC-500).
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