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首页> 外文期刊>CERAMICS INTERNATIONAL >Impact of calcination atmospheres on the physiochemical and photocatalytic properties of nanocrystalline TiO2 and Si-doped TiO2
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Impact of calcination atmospheres on the physiochemical and photocatalytic properties of nanocrystalline TiO2 and Si-doped TiO2

机译：煅烧气氛对纳米晶TiO2和Si掺杂TiO2的物理化学和光催化性能的影响

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Nanocrystalline TiO2 and Si-doped TiO2 samples were prepared by solvothermal and sol-gel methods. Before the characterization and photocatalytic test, the thus-obtained powder and gel were calcined under different atmospheric gas flows (O-2, air, and N-2). The physiochemical properties of the samples were determined using X-ray diffraction (XRD), ultraviolet visible spectroscopy (UV-vis), electron spin resonance (ESR), transmission electron microscope (TEM), energy dispersive X-ray spectrometer (EDX) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity was evaluated by the degradation of methylene blue (MB) dye under UV and visible light irradiation. The solvothermal-made N-2-treated TiO2 nanocatalyst showed the highest photocatalytic activity under both UV and visible light irradiation. The addition of Si resulted in the formation of partial monolayer of Si on TiO2 nanocatalyst and an increase of the anatase phase stability. The ESR and XPS results reveal that the calcining atmosphere affected the distribution concentration of surface and interface species in TiO2 and Si-doped TiO2, such as surface oxygen and Ti3+ sites, thus improving photocatalytic activity. The increasing of anatase phase stability and the formation of Ti3+ sites due to N-2-treated and Si-doped TiO2 nanocatalyst promoted the photocatalytic activity of MB degradation. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：采用溶剂热法和溶胶-凝胶法制备了纳米晶TiO2和掺Si的TiO2样品。在表征和光催化测试之前，将如此获得的粉末和凝胶在不同的大气流量（O-2，空气和N-2）下煅烧。使用X射线衍射（XRD），紫外可见光谱（UV-vis），电子自旋共振（ESR），透射电子显微镜（TEM），能量色散X射线光谱仪（EDX）和X射线光电子能谱（XPS）。通过在紫外线和可见光照射下亚甲基蓝（MB）染料的降解来评估光催化活性。溶剂热制得的N-2-处理的TiO2纳米催化剂在紫外和可见光照射下均表现出最高的光催化活性。 Si的添加导致在TiO 2纳米催化剂上形成Si的部分单层，并且锐钛矿相稳定性增加。 ESR和XPS结果表明，煅烧气氛影响了TiO2和Si掺杂的TiO2中表面和界面物种（如表面氧和Ti3 +位）的分布浓度，从而提高了光催化活性。 N-2处理和掺Si的TiO2纳米催化剂引起的锐钛矿相稳定性的增加和Ti3 +位的形成促进了MB降解的光催化活性。 （C）2015 Elsevier Ltd和Techna Group S.r.l.版权所有。

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