...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Hazardous Materials >The layered double hydroxide route to Bi-Zn co-doped TiO2 with high photocatalytic activity under visible light
【24h】

The layered double hydroxide route to Bi-Zn co-doped TiO2 with high photocatalytic activity under visible light

机译：可见光下层状双氢氧化物路线获得高光催化活性的Bi-Zn共掺杂TiO2

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

In this work, a co-doped Bi-Zn-TiO2 photocatalist is synthesized by an original synthesis route of layered double hydroxide followed by heat treatment at 670 degrees C. After characterization the photocatalyst efficiency is estimated by the photo-discoloration of an anionic dye (indigo carmine) under visible light and compare to TiO2-P25 as reference material. In this new photocatalyst, anatase and ZnO wurtzite are the only identified crystalline phase, rutile and Bi2O3 being undetected. Moreover, the binding energy of Bi determined (XPS analysis) is different from the one of Bi in Bi2O3. Compared to TiO2-P25, the absorption is red shifted (UV-vis DRS) and the Bi-Zn-TiO2 photocatalyst showed sorption capacity toward indigo carmine higher than that TiO2-P25. The kinetics of the photo-discoloration is faster with Bi-Zn-TiO2 than with TiO2-P25. Indeed, a complete discoloration is obtained after 70 min and 120 min in the presence of Bi-Zn-TiO2 and TiO2-P25 respectively. The identification of the responsible species on photo-discoloration was carried out in the presence of different scavengers. The study showed that the first responsible is h(+) specie with a moderate contribution of superoxide anion radical and a minor contribution of the hydroxyl radical. The material showed high stability after five uses with the same rate of photo-discoloration. (C) 2015 Elsevier B.V. All rights reserved.
机译：在这项工作中，通过层状双氢氧化物的原始合成路线，然后在670℃下进行热处理，合成了共掺杂的Bi-Zn-TiO2光催化剂。表征后，通过阴离子染料的光致变色估计光催化剂的效率。 （靛蓝胭脂红）在可见光下，并与TiO2-P25作参比材料进行比较。在这种新的光催化剂中，锐钛矿和氧化锌纤锌矿是唯一确定的结晶相，金红石和Bi2O3未被发现。此外，确定的Bi的结合能（XPS分析）不同于Bi2O3中Bi的结合能。与TiO2-P25相比，其吸收发生了红移（UV-vis DRS），Bi-Zn-TiO2光催化剂显示出对靛蓝胭脂红的吸附能力高于TiO2-P25。与TiO2-P25相比，Bi-Zn-TiO2的光致变色动力学更快。实际上，在分别存在Bi-Zn-TiO2和TiO2-P25的情况下，分别在70分钟和120分钟后会发生完全脱色。在存在不同清除剂的情况下，对光变色的负责任物种进行了鉴定。研究表明，第一个负责人是h（+）物种，具有适度的超氧阴离子自由基和少量的羟基自由基。该材料在五次使用后显示出高稳定性，并且光变色速率相同。 （C）2015 Elsevier B.V.保留所有权利。

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