Anatase grain loaded brookite nanoflower hybrid with superior photocatalytic activity for organic degradation

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• 作者：Yanchao Jiao^a ; ^{jiaojj@126.com} ; Feng Chen^a ; ^{fengchen@ecust.edu.cn} ; Bin Zhao^a ; ^b ; ^{zhaobinwily@163.com} ; Hongyun Yang^a ; ^{yanghongyun001@163.com} ; Jinlong Zhang^a ; ^{jlzhang@ecust.edu.cn}
• 关键词：Hybrid catalysts ; Unique morphology ; Excellent photocatalytic activity
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2012
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：20 May, 2012
• 卷：402
• 期：Complete
• 页码：66-71
• 文件大小：1159 K

摘要

A series of brookite and anatase TiO₂ hybrids with different ratios were synthesized by in situ hydrolysis of tetrabutyl titanate (TBOT) on the pre-prepared brookite nanoflowers. The composition and content of the mixture were examined by X-ray diffraction (XRD). The morphology and construction of the hybrids were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM), while BET was used to measure the specific surface area of all the samples. Anatase nano-grains grow on the surface of brookite petals, which builds special heterojunction on their interface and thus benefits the separation of photogenerated electrons and holes under UV irradiation. The TiO₂ hybrids appeared superior photocatalytic activity to the single phase toward the degradation of methyl orange (MO) and 2,4-dichlorophenol (2,4-DCP). The hybrid contains 40%anatase and 60%brookite exhibited the highest activity, the degradation rate constants of which are 2.27 and 1.80 times higher than that of the corresponding physically mixed sample for the degradation of MO and 2,4-DCP, respectively.