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通过溶胶-凝胶过程,在经过有机改性的可再生载银磁性沸石的磁颗粒表面形成介孔硅涂层(以防止磁性粒子被氧化或在酸性环境中被腐蚀)。用元素分析、BET比表面积测定、X射线衍射分析等对吸附剂进行了表征。用浸渍法将聚四氟乙烯(PTFE)滤袋纤维和可再生载银磁性沸石制成复合吸附剂,并对其用浓度分别为5%(wt,质量分数,下同)、10%、15%的HNO_3溶液进行改性。在汞固定床实验台上进行了该复合吸附剂改性前后吸附单质汞的测试,实验结果表明,在汞蒸气入口浓度为45μg/m3,吸附温度为160℃,磁性沸石与PTFE纤维的质量比为2∶1时,对Hg~0脱除效率最高,可达76.5%,经过5%、10%的HNO_3改性后的吸附剂分别比未改性前脱汞率提高了4%、9%,而经过15%的HNO_3溶液改性后,吸附剂脱汞效率降低。
Through the sol-gel process, a mesoporous silicon coating is formed on the surface of the magnetically modified, regenerable silver loaded magnetic magnetic particles (to prevent the magnetic particles from being oxidized or corroded in an acidic environment). The adsorbent was characterized by elemental analysis, BET specific surface area measurement and X-ray diffraction analysis. The impregnated polytetrafluoroethylene (PTFE) filter bag fibers and regenerable silver magnetic zeolite composite adsorbent, and its concentration were 5% (wt, mass fraction, the same below), 10%, 15 % Of HNO 3 solution was modified. The experimental results showed that the mass ratio of magnetic zeolite to PTFE fibers was 45μg / m3 at mercury inlet and 160 ℃ at the inlet of mercury vapor. Is 2: 1, the removal efficiency of Hg ~ 0 is the highest, up to 76.5%. After 5% and 10% HNO 3 modified adsorbents respectively, the mercury removal rate before unmodification increases by 4% and 9% , While after 15% HNO 3 solution was modified, the adsorbent mercury removal efficiency decreased.