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中文摘要：
采用静电纺丝法成功制备了TiO2-WO3纳米纤维,利用X-射线衍射(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscopy,SEM)、紫外可见吸收光谱(ultraviolet-visible,UV-Vis)及比表面积及孔径分析仪(Brunauer-Emmett-Teller,BET)对其进行表征。使用制备的纤维脱除模拟烟气中的元素汞,研究了TiO2-WO3分别在无光、紫外光和可见光下的脱汞率;考察了WO3的最佳掺杂比;并分析了TiO2-WO3光催化脱汞的机制。结果表明TiO2-WO3纤维中TiO2以锐钛矿相形态存在,纤维的直径约为200nm;当WO3的掺杂含量为7%时,TiO2-WO3在紫外光下的汞脱除率可达到100%;TiO2-WO3脱汞效率的稳定性好,在420 min时紫外光下的脱汞率仍保持在100%。表面酸性和有效的电荷转移是TiO2-WO3纳米纤维光催化活性提高的主要原因。
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