Enhanced simulated sunlight induced photocatalytic activity by pomegranate-like S doped SnO2@TiO2 spheres
Enhanced simulated sunlight induced photocatalytic activity by pomegranate-like S doped SnO2@TiO2 spheres
复制标题
石榴状 S 掺杂 SnO2@TiO2 球体增强模拟太阳光诱导光催化活性
DOI：
10.1016/j.colsurfa.2015.06.011
复制
发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
陈建峰
中科院分区：
文献类型：
--
作者：
王倩;方玉;孟洪;毋伟;初广文;邹海魁;程道建;陈建峰
在本研究中，我们制备了石榴状S掺杂SnO2@TiO2复合球形纳米粒子，具有较高的模拟太阳光催化活性。用透射电子显微镜、高分辨电子显微镜、扫描电子显微镜、X射线衍射仪、X射线能谱、X射线光电子能谱等测试手段对其形貌和结构性能进行了表征。UV-Vis光谱表明，与纯二氧化钛相比，复合粒子的吸收边变宽，能带宽度变窄。与TiO2光催化剂、S掺杂的TiO2光催化剂、SnO2@TiO2光催化剂相比，复合粒子具有较高的光催化活性。在模拟太阳光照射下，合成复合粒子可在200min内将罗丹明B(RhB)染料降解97%。电子清除剂K2S2O8可使光催化活性提高62%，表明空穴对有机污染物的氧化起主要作用。并对制备的S掺杂的SnO2@TiO2复合纳米粒子在太阳能催化领域的应用前景进行了机理探讨。
In the present study we prepared pomegranate-like S doped SnO2@TiO2composite sphere nanoparticles with high simulated sunlight photocatalytic activity. Various characterization techniques such as TEM, HRTEM, SEM, XRD, EDX, XPS were used to check its morphology and structural properties. UV–vis spectra showed that the composite particles have broadened absorption edge and narrowed energy band gap compared with pure TiO2. The composite particles displayed enhanced photocatalytic activity compared with other photocatalysts, including TiO2, S doped TiO2, SnO2@TiO2, etc. The rhodamine B (RhB) dyes can be degraded by 97% in 200 min, by synthesizing composite particles, under the simulated sunlight irradiation. The electron scavenger (K2S2O8) can accelerate the photocatalytic activity by 62%, indicating that the holes act as the major role for the oxidization of organic pollutants. Mechanism discussion was also proposed to support that the prepared S doped SnO2@TiO2composite nanoparticles can serve as a promising candidate for the applications in many solar catalytic fields.
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