NaBH4 modified TiO2: Defect site enhancement related to its photocatalytic activity
NaBH4 modified TiO2: Defect site enhancement related to its photocatalytic activity
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DOI：
10.1016/j.matchemphys.2017.07.054
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发表时间：
2017-09-15
影响因子：
4.6
通讯作者：
Gao, Wei
中科院分区：
文献类型：
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作者：
Ariyanti, Dessy;Mills, Laura;Gao, Wei
通过在氩气氛下对原始 TiO2 纳米颗粒进行 NaBH4 辅助热处理（300-450 ℃），合成了有缺陷的 TiO2 纳米粉末。通过提高工艺温度，可以获得更高的缺陷百分比（氧空位）。与缺陷浓度一致，还观察到可见光吸收的显着增强。进一步表征表明，NaBH4 处理产生的缺陷主要是引发电子和空穴复合的体缺陷。缺陷的浓度有助于光催化活性。 NaBH4在350℃还原产生的可控缺陷导致模拟太阳光下罗丹明B降解具有更好的光催化活性。 (C) 2017 Elsevier B.V. 保留所有权利。
Defected TiO2 nano-powder was synthesized by applying NaBH4 assisted heat treatment (300-450 degrees C) on pristine TiO2 nanoparticles under argon atmosphere. By increasing the process temperature, higher defect percentage (oxygen vacancies) can be achieved. In line with the defect concentration, significant enhancement of absorption in visible light also observed. Further characterization reveal that the defect created via NaBH4 treatment is mainly bulk defect which trigger recombination of electrons and holes. The concentration of defect contributes to the photocatalytic activity. Controllable defect produced by NaBH4 reduction at 350 degrees C lead to the better photocatalytic activity performance of Rhodamine B degradation under simulated solar light. (C) 2017 Elsevier B.V. All rights reserved.