Details

Autor(en) / Beteiligte

• Guo, Sheng-Qi
• Zhen, Meng-Meng
• Sun, Mei-Qing
• Zhang, Xiao
• Zhao, Ya-Ping
• Liu, Lu

Titel

Controlled fabrication of hierarchical WO·HO hollow microspheres for enhanced visible light photocatalysis

Ist Teil von

• RSC advances, 2015-02, Vol.5 (21), p.16376-16385

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• WO 3 ·H 2 O nanostructures have been prepared through a facile hydrothermal route by controlling their morphology during synthesis. WO 3 ·H 2 O nanoplates with a thickness of ∼45 nm and hierarchical hollow microspheres (HMSs) structures could be obtained by introducing different amounts of citric acid. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed to understand the structure and morphology of the two types of WO 3 ·H 2 O. The formation mechanisms for WO 3 ·H 2 O nanoplates and WO 3 ·H 2 O HMSs were investigated. The photocatalytic activities, determined by rhodamine B (RhB) degradation under visible light irradiation of WO 3 ·H 2 O HMSs photocatalysts, were significantly improved as compared with WO 3 ·H 2 O nanoplates. The higher efficiency of photocatalytic activity in WO 3 ·H 2 O HMSs was attributed to its higher surface-to-volume ratio and stability against aggregation. In addition, we investigated the toxicity of WO 3 ·H 2 O HMSs against an important model fungus, yeast ( Saccharomyces cerevisiae ). The results indicate that the as-synthesized hierarchical WO 3 ·H 2 O HMSs could be used as a green and efficient photocatalyst. A new type of hierarchical WO 3 ·H 2 O hollow microsphere, whose formation was successfully controlled based on the reaction system for preparing simple nanoplates, showed excellent photocatalytic activity for the degradation of dye under visible light.