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- 2019
一步水热合成Sm3+-SrTiO3/TiO2复合纳米纤维及可见光催化性能
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Abstract:
以电纺TiO2纳米纤维为基体和反应物，通过一步水热法，将SrTiO3原位构筑在TiO2纳米纤维表面的同时将稀土Sm3+掺入SrTiO3中，合成了Sm3+-SrTiO3/TiO2复合纳米纤维光催化材料.利用XRD、XPS、FESEM和HRTEM等测试手段对样品进行了表征.以罗丹明B和对氯苯酚模拟有机污染物进行光催化降解.结果表明：稀土Sm3+掺杂进入SrTiO3晶格取代Sr2+，在SrTiO3禁带内形成杂质能级，拓宽了光谱响应范围；同时在SrTiO3晶格内引入了缺陷位，成为电子的捕获中心，降低了载流子的复合几率；而SrTiO3与TiO2复合形成异质结，进一步提高了光生电子-空穴的分离程度，Sm3+-SrTiO3/TiO2复合纳米纤维表现出良好的可见光催化活性。 A novel Sm3+-SrTiO3/TiO2 composite nanofibers were synthesized by one-step hydrothermal technique. By this way, TiO2 nanofibers could serve as the both substrate and reactant. Moreover, not only doping of Sm3+ into SrTiO3 but also in-situ growth of SrTiO3 on skeleton of TiO2 could be simultaneously satisfied. The as-synthesized Sm3+-SrTiO3/TiO2 composite nanofibers were characterized by XRD, XPS, FESEM and HRTEM. The photocatalytic activity was evaluated by the degradation of rhodamine B and p-chloro phenol. The results show that rare earth Sm3+ ions are doped into the SrTiO3 lattice and replace Sr2+ in SrTiO3, forming an impurity level in forbidden band. The range of the light absorption by SrTiO3 is enlarged. Meanwhile, the defects are introduced into SrTiO3 lattice, acting as trapping cites of photogenerated electrons and hence reducing the recombination of charge carrier. The additionally, the heterojunction between SrTiO3 and TiO2 is beneficial for the electronic-hole separation. With these regards, Sm3+ doped SrTiO3/TiO2 composite nanofibers exhibit highly photocatalytic activity under visible light. 国家自然科学基金（21573003）；吉林省自然科学基金（20140101118JC
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