论文部分内容阅读
使用静电纺丝法制备TiO2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Ag2O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Ag2O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.
XRD, SEM, EDX, UV-Vis and BET detection of nanofibers were carried out to prepare TiO2 and TiO2-Ag2O nanofibers by electrospinning method, and the mercury in simulated flue gas was removed.The effects of Ag2O Doping ratio and the number of cycles on mercury removal, the mechanism of mercury removal from TiO2-Ag2O was analyzed.The results showed that the TiO2-Ag2O nanofibers were anatase phase and the diameter of fiber was about 200nm.Compared with pure TiO2, TiO2- Ag2O absorption range increased, the utilization of visible light increased, and with the increase of Ag2O doping amount of light on the fibers also increased gradually.TiO2-Ag2O nanofibers in the light, visible light and UV light mercury removal rate All reached more than 95% .The synthesis of composite nanofibers with mercury removal performance was stable, and the mercury removal rate remained above 95% at the 8th cycle.The mercury removal mechanism of TiO 2 -Ag 2 O could be formed by amalgamation of silver and mercury Silver amalgam.