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中文摘要：
使用静电纺丝法制备TiO。及TiO2-Ag2O纳米纤维，脱除模拟烟气中的汞元素．对纳米纤维进行了XRD，SEM，EDX，uV—Vis及BET检测．研究了不同光照条件下Ag。O的掺杂比和循环次数对脱汞的影响，分析了TiO2-Ag2O的脱汞机理．结果表明：TiO2-Ag2O纳米纤维为锐钛矿相，纤维直径在200nm左右．与纯TiO2相比，TiO2-Ag2O的吸光范围增大，对可见光的利用率提高，并且随着AgzO掺杂量的增加纤维对光的吸收也逐渐增强．TiO2-Ag2O纳米纤维在无光、可见光及紫外光下的脱汞率均达到95％以上．合成的复合纳米纤维脱汞性能稳定，到第8次循环时脱汞率仍保持在95％以上．TiO2—Ag2O脱汞的机理可为银与汞通过汞齐化作用形成银汞合金．
英文摘要：
TiO2 and TiOe-Ag20 nanofibers prepared by electrospinning method were used to remove elemental mercury from simulated coal combustion flue gas. The nanofibers were characterized by XRD （X-ray diffraction）, SEM （scanning electron microscope）, UV-Vis （ultraviolet-visible） spectra as well as BET （Brunauer-Emmett-Teller）. The mercury removal efficiency under different light conditions, the optimum doping content of Ag2 O as well as the capability to oxidize Hg^0 for 8 cycles were tested. The mechanism of Hg^0 removal over TiO2-Ag2O was deduced. The result shows that TiO2- Ag2O nanofibers exhibited an anatase phase structure with average diameter of 200 nm. Compared with pure TiO2, the absorption wavelength range of TiO2-Ag2O is expanded and the utilization ratio of visible light is improved. In addition, the UV-Vis absorption intensity of TiO2-Ag20 significantly increases with increasing Ag2O doping content. Hg^0 removal efficiencies of TiO2-Ag2 O are all around 95% whatever in the dark, under visible light or UV light. After the eighth cycle, its Hg^0 removal efficiency remained above 95%, which indicated it was stable with prolonged use of the catalyst. The mechanism of Hg^0 removal over TiO2-Ag2O is considered to form silver amalgam via amalgamation.
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