Effect of calcined atmosphere on the photocatalytic activity of P-doped TiO2
Effect of calcined atmosphere on the photocatalytic activity of P-doped TiO2
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DOI：
10.1016/j.apsusc.2013.10.157
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发表时间：
2014-01
影响因子：
6.7
通讯作者：
Yue Xia;Yin-shan Jiang;Fangfei Li;Maosheng Xia;B. Xue;Yanjuan Li
中科院分区：
文献类型：
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作者：
Yue Xia;Yin-shan Jiang;Fangfei Li;Maosheng Xia;B. Xue;Yanjuan Li
采用溶胶-凝胶法，加入H3 PO 4，制备了磷掺杂的二氧化钛。在不同气氛和不同温度下对样品进行煅烧，以影响P掺杂TiO 2中Tisingle键O结合行为。采用TG-DTA、XRD、FTIR、XPS、TEM和UV-vis等测试手段对样品的物化性能进行了研究。以甲基橙子（MO）染料为降解对象，在紫外和可见光照射下考察了其光催化活性。结果表明，不同热气氛下煅烧的P掺杂TiO 2具有完全不同的性能。XRD和UV-vis分析表明，在还原性气氛下煅烧可以增加P物种在TiO 2中的作用。进一步的光催化实验也表明，在碳热还原气氛下煅烧的P掺杂TiO 2（R-PT）比在空气中煅烧的P掺杂TiO 2（A-PT）具有更高的光催化活性。XPS分析结果表明，煅烧气氛改变了P掺杂TiO 2表面和界面物种的分布浓度，如表面氧和Ti 3+位，从而提高了R-PT的光催化活性和重复利用性能。进一步的机理研究表明，P掺杂促进TiO 2光催化活性的主要原因是表面形成了Ti 3+位，而不是表面氧的过量。而碳热过程有助于在高温煅烧过程中保留这些Ti 3+位，从而提高P掺杂TiO 2的光催化活性，特别是当P物种的掺杂水平相对较低时。
Titanium dioxide doped with phosphorus was synthesized by the sol–gel method with H3PO4addition. The samples were calcined at different temperatures under different atmospheres, in order to affect the Tisingle bondO combination behavior in P-doped TiO2. The physicochemical properties of the prepared samples were investigated using TG-DTA, XRD, FTIR, XPS, TEM and UV–vis. The photocatalytic activity was evaluated by degradation of methyl orange (MO) dye under UV and visible-light irradiation. The results show that P-doped TiO2calcined in different thermal atmosphere reveals entirely different performances. The XRD and UV–vis analysis reveal that the effect of P species in TiO2is increased by calcining in reducing atmosphere. Further photocatalytic experiments also display that P-doped TiO2calcined under carbothermal reduction atmosphere (R-PT) exhibits higher photocatalytic activity than that calcined in air (A-PT). The XPS results confirms that the calcining atmosphere changes the distribution concentration of surface and interface species in P-doped TiO2, such as surface oxygen and Ti3+sites, resulting in the improved photocatalytic activity and enhanced reutilization performance of R-PT. Further mechanism study illustrates that the promoting photocatalytic activity of P-doped TiO2are ascribed to the formation of Ti3+sites rather than exceeding oxygen on the surface. And the carbothermal process helps to reserve these Ti3+sites during high temperature calcination, resulting in the increased photocatalytic activity of P-doped TiO2, especially when the doping level of P species is relative low.