Controllable Synthesis of α-Bi2O3 and γ-Bi2O3 with High Photocatalytic Activity by α-Bi2O3/γ-Bi2O3/α-Bi2O3 Transformation in a Facile Precipitation Method
Controllable Synthesis of α-Bi2O3 and γ-Bi2O3 with High Photocatalytic Activity by α-Bi2O3/γ-Bi2O3/α-Bi2O3 Transformation in a Facile Precipitation Method
复制标题
通过简便沉淀法通过 α-Bi2O3/γ-Bi2O3/α-Bi2O3 转化可控合成具有高光催化活性的 α-Bi2O3 和 γ-Bi2O3
DOI：
10.1016/j.jallcom.2016.08.047
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发表时间：
2016
影响因子：
6.2
通讯作者：
Can Li
中科院分区：
文献类型：
--
作者：
Guo Liu;Shuai Li;Yuanyuan Lu;Jing Zhang;Zhaochi Feng;Can Li
通过一种简便的溶液结晶法可控地制备了棒状α -Bi₂O₃和四面体γ -Bi₂O₃颗粒，该方法在温和的反应条件下进行，无需任何表面活性剂和/或模板。结合X射线粉末衍射、高分辨率透射电子显微镜、扫描电子显微镜、X射线光电子能谱和紫外 - 可见吸收光谱的结果，研究了Bi₂O₃的形貌和晶相演变与反应时间和反应温度的关系。有趣的是，发现了α -Bi₂O₃/γ -Bi₂O₃/α -Bi₂O₃的转变现象。纳米棒状α -Bi₂O₃相在短时间内形成，而当反应时间足够长时，α -Bi₂O₃可转变为四面体γ -Bi₂O₃晶体。然而，随着反应时间进一步增加，γ -Bi₂O₃可能转变为棒状α -Bi₂O₃。此外，可以推断出高反应温度促进了从α -Bi₂O₃到γ -Bi₂O₃，然后从γ -Bi₂O₃到α -Bi₂O₃的转变。以罗丹明B作为模型污染物，通过光催化降解来评估不同晶相的Bi₂O₃的光催化活性。与α -Bi₂O₃相比，γ -Bi₂O₃表现出比α -Bi₂O₃更低的电子 - 空穴复合率，显示出优异的光催化活性。
Rod-like a-Bi2O3 and tetrahedral g-Bi2O3 particles have been controlled fabricated by a facile solution crystallization method, which was performed at a mild reaction condition without any surfactants and/or templates. By combining the results of X-ray powder diffraction, high resolution transmission electron.microscope, scanning electron microscopy, Xeray photoelectron spectra, and UV-visible absorption spectra, the morphology and crystalline phase evolution of Bi2O3 was studied versus reaction time and reaction temperature. It is interesting to note that the phenomenon of a-Bi2O3 / g-Bi2O3 / a-Bi2O3 transformation was found. The nanorod a-Bi2O3 phase formed in a short time, while a-Bi2O3 could transform to tetrahedral g-Bi2O3 crystals upon enough reaction time. However, g-Bi2O3 may transform into rod-shape a-Bi2O3 with further increasing the reaction time. Moreover, it can be deduced that high.reaction temperature promoted the transformation from a-Bi2O3 to g-Bi2O3, and then from g-Bi2O3 to a-Bi2O3. The photocatalytic activities of Bi2O3 with different crystalline phases were evaluated by the photocatalytic degradation of rhodamine B as a model pollutant. The g-Bi2O3, which exhibits lower.electrons-holes recombination rate than that of a-Bi2O3, showed excellent photocatalytic activity as compared with the a-Bi2O3.