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Solvent effect on morphological evolution and photocatalytic property of α-SnWO4
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2018-11-15 , DOI: 10.1016/j.jtice.2018.09.014
Xuewei Liu , Bo Liang , Jingkai Yang , Weifeng Li

Alpha-phase stannous tungstate (α-SnWO4) nano-crystals with different morphologies were successfully synthesized by changing water content in ethylene glycol (EG) using a solvothermal method. The obtained samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It was found that the morphologies of α-SnWO4 samples transformed from nanostrip to nanosheet with increasing water content, which is ascribed to the improved mass transfer in the water medium. Photocatalytic activities of the products were evaluated by the degradation of methyl orange (MO) under visible light irradiation. The microstructure of α-SnWO4 played an important role on its photocatalytic activity. As a result, the α-SnWO4 with high crystallinity and large surface area exhibited the best photocatalytic activity and its degradation efficiency reached to 90.4% within 30 min. Based on active species trapping experiments, both hole (h+) and superoxide radical (·O2) are dominant active species in the photodegradation of MO over α-SnWO4 nano-materials and thus a possible mechanism was proposed.



中文翻译:

形态学进化和光催化性能的溶剂效应α-SnWO 4

α相的亚锡钨(α-SnWO 4)具有不同形态的纳米晶体成功地通过使用溶剂热法在乙二醇(EG)改变含水量合成。通过X射线衍射(XRD),透射电子显微镜(TEM)和X射线光电子能谱(XPS)对获得的样品进行表征。我们发现的形貌α-SnWO 4个从nanostrip转化为纳米片样品水含量的增加,这归因于在水介质改进的传质。通过在可见光照射下甲基橙(MO)的降解来评估产物的光催化活性。的微观结构α-SnWO 4在其光催化活性中起着重要作用。其结果是,α-SnWO 4具有高结晶度和大的表面积表现出最佳的光催化活性和它的降解效率在30分钟内达到90.4%。基于活性物质捕集实验,无论孔(H +)和超氧自由基(·O2 2 - )是在MO上的α-SnWO光降解主导活性种4纳米材料,因此,提出了一种可能的机制。

更新日期:2018-11-15
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