Synthesis of heterostructured Pd@TiO2/TiOF2 nanohybrids with enhanced photocatalytic performance
Synthesis of heterostructured Pd@TiO2/TiOF2 nanohybrids with enhanced photocatalytic performance
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具有增强光催化性能的异质结构Pd@TiO2/TiOF2纳米杂化物的合成
DOI：
10.1016/j.materresbull.2016.04.018
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发表时间：
2016
影响因子：
5.4
通讯作者：
Jun Zhang
中科院分区：
文献类型：
--
作者：
Xixia Zhao;Guijuan Wei;Junxue Liu;Zhaojie Wang;Changhua An;Jun Zhang
采用溶剂热法合成了二氧化钛/二氧化钛异质结构纳米复合材料，并用X射线衍射仪、扫描电子显微镜、透射电子显微镜、氮气吸附-脱附等温线、紫外可见光谱和光致发光光谱对其进行了表征。结果发现，与单一的TiOF2或TiOF2相比，所制备的TiOF2/TiOF2纳米复合材料对有机污染物罗丹明B的降解和太阳放氢具有更好的光催化活性。这一结果与这两种样品在光照下光生电子和空穴复合的禁止规律一致。通过一种简单的沉积方法将Pd纳米粒子引入到TiO2/TiOF2表面，而不使用任何稳定剂，可以进一步提高光催化活性，这可能是由于Pd纳米粒子的引入增强了可见光吸收以及促进了电荷-载流子的分离。讨论了TiOF2和TiO2之间的协同作用，并解释了它们的活性比单一化合物提高的原因。
TiO2/TiOF2heterostructured nanocomposites has been synthesized through a solvothermal method and characterized by X-ray diffraction, scanning electronic microscopy, transmission electronic microscopy, nitrogen adsorption–desorption isotherms, UV–vis and photo-luminescent spectroscopy. It was found that, compared with single TiOF2or TiO2, the as-prepared TiO2/TiOF2nanocomposites exhibited superior photoactivity towards the degradation of organic pollutants,i.e. rhodamine B and solar hydrogen evolution. The results are in accordance with the prohibition of photogenerated electrons and holes recombination in these two samples under light illumination. The photocatalytic activity can be further boosted by introducing Pd nanoparticles onto the surfaces of TiO2/TiOF2through a simple deposition method without using any stabilizers, which is probably attributed to the enhanced visible-light absorption as well as the facilitated charge-carrier separation after the introduction of Pd nanoparticles. The synergistic effect between TiOF2and TiO2was discussed and was responsible for the enhancement of their activity in comparison with single counterpart.