Bi7Ti4NbO21的合成、酸化及光催化性能

doi:10.6040/j.issn.1672-3961.0.2016.257

摘要/Abstract

摘要： 采用化学溶液分解法制备了Aurivillius结构钛酸铋铌化合物Bi₇Ti₄NbO₂₁,并对其进酸化处理。X射线衍射(X-ray diffraction, XRD)表征表明, 500 ℃以上的温度进行热处理,可以制得结晶性良好的Bi₇Ti₄NbO₂₁。对Bi₇Ti₄NbO₂₁进行浓硝酸酸化处理,可转化为结晶性良好的焦绿石结构钛酸铋化合物Bi₂Ti₂O₇。采用SEM观察了所合成的Bi₇Ti₄NbO₂₁和Bi₂Ti₂O₇的形貌和尺寸。在紫外光照射下对甲基橙的光催化降解实验表明,所合成的钛酸铋铌化合物Bi₇Ti₄NbO₂₁及其酸化产物钛酸铋Bi₂Ti₂O₇均具有良好的光催化活性。试验结果表明,光催化剂颗粒的结晶性及其尺寸对其光催化活性均具有很大影响。550 ℃热处理得到的Bi₇Ti₄NbO₂₁具有最高的催化活性,而将钛酸铋铌酸化处理得到的Bi₂T_i2O₇其光催化性能显著提高,优于标准光催化剂P25。

关键词: 光催化, Bi₂Ti₂O₇, Bi₇Ti₄NbO₂₁, 降解, 酸化

Abstract: Aurivillius compound Bi₇Ti₄NbO₂₁ was fabricated by a chemical solution decomposition method(CSD)and acid treated. X-ray diffraction(XRD)analysis revealed that well-crystallized Bi₇Ti₄NbO₂₁ could be prepared with a calcination temperature at or above 550 ℃. Well-crystallized Bi₂Ti₂O₇ with uniform particle sizes was obtained by concentrated nitric acid treatment. Field emission scanning electron microscopy(FESEM)was used to examine the morphology and particles size of as-prepared Bi₇Ti₄NbO₂₁ and acid-treated product Bi₂Ti₂O₇. The results showed that both Bi₇Ti₄NbO₂₁ and Bi₂Ti₂O₇ were highly photocatalytic active for the degradation of organic dye methyl orange under UV light irradiation. The crystallinity and particles size of as-prepared photocatalysts were found to strongly influence the photocatalytic activities. The BTN-550 calcined at 550 ℃ showed the highest activity of as-prepared Bi₇Ti₄NbO₂₁. The Bi₂Ti₂O₇ obtained by acid-treated Bi₇Ti₄NbO₂₁ exhibited remarkable enhanced photocatalytic activity which was superior to that of P25.

Key words: acid treatment, photocatalytic, degradation, Bi₂Ti₂O₇, Bi₇Ti₄NbO₂₁

中图分类号:

TB321

于正刚,常宁,赵根源,石春颖,周爱秋. Bi₇Ti₄NbO₂₁的合成、酸化及光催化性能[J]. 山东大学学报(工学版), 2017, 47(2): 106-110.

YU Zhenggang, CHANG Ning, ZHAO Genyuan, SHI Chunying, ZHOU Aiqiu. Fabrication and acid treatment of Bi₇Ti₄NbO₂₁ and their photocatalytic properties[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2017, 47(2): 106-110.

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Bi₇Ti₄NbO₂₁的合成、酸化及光催化性能

Fabrication and acid treatment of Bi₇Ti₄NbO₂₁ and their photocatalytic properties

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