• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Visible light assisted photocatalytic hydrogen generation by Ta2O5/Bi2O3, TaON/Bi2O3, and Ta3N5/Bi2O3 composites
【24h】

Visible light assisted photocatalytic hydrogen generation by Ta2O5/Bi2O3, TaON/Bi2O3, and Ta3N5/Bi2O3 composites

机译：Ta2O5 / Bi2O3，TaON / Bi2O3和Ta3N5 / Bi2O3复合材料的可见光辅助光催化制氢

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Composites comprised of two semiconducting materials with suitable band gaps and band positions have been reported to be effective at enhancing photocatalytic activity in the visible light region of the electromagnetic spectrum. Here, we report the synthesis, complete structural and physical characterizations, and photocatalytic performance of a series of semiconducting oxide composites. UV light active tantalum oxide (Ta2O5) and visible light active tantalum oxynitride (TaON) and tantalum nitride (Ta3N5) were synthesized, and their composites with Bi2O3 were prepared in situ using benzyl alcohol as solvent. The composite prepared using equimolar amounts of Bi2O3 and Ta2O5 leads to the formation of the ternary oxide, bismuth tantalate (BiTaO4) upon calcination at 1000 degrees C. The composites and single phase bismuth tantalate formed were characterized by powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), Brunauer-Emmett-Teller (BET) surface area measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy, and photoluminescence. The photocatalytic activities of the catalysts were evaluated for generation of hydrogen using aqueous methanol solution under visible light irradiation (lambda >= 420 nm). The results show that as-prepared composite photocatalysts extend the light absorption range and restrict photogenerated charge-carrier recombination, resulting in enhanced photocatalytic activity compared to individual phases. The mechanism for the enhanced photocatalytic activity for the heterostructured composites is elucidated based on observed activity, band positions calculations, and photoluminescence data.
机译：据报道，由具有合适的带隙和能带位置的两种半导体材料组成的复合材料可有效增强电磁波谱在可见光区域的光催化活性。在这里，我们报告了一系列半导体氧化物复合材料的合成，完整的结构和物理特征以及光催化性能。合成了紫外光活性氧化钽（Ta2O5），可见光活性氧氮化钽（TaON）和氮化钽（Ta3N5），并以苯甲醇为溶剂原位制备了它们与Bi2O3的复合材料。使用等摩尔量的Bi2O3和Ta2O5制备的复合物在1000摄氏度下煅烧时会形成三元氧化物钽酸铋（BiTaO4）。通过粉末X射线衍射（PXRD）对复合物和单相钽酸铋进行表征，热重分析（TGA），Brunauer-Emmett-Teller（BET）表面积测量，扫描电子显微镜（SEM），透射电子显微镜（TEM），UV-Vis漫反射光谱和光致发光。在可见光照射下（λ≥420nm），使用甲醇水溶液评估催化剂的光催化活性以产生氢。结果表明，所制备的复合光催化剂扩展了光吸收范围并限制了光生电荷载流子的重组，与各个相相比，光催化活性得到增强。基于观察到的活性，能带位置计算和光致发光数据，阐明了增强异质结构复合材料光催化活性的机理。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号