摘要
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。
By a sol-gel process,mesoporous silica coating formed on the surface of magnetic particles of organically modified regenerable magnetic silver loaded adsorhent （to protect the magnetic particles from oxidation or corrosion in acid- ic environments）. BET specific surface area measurements,X-ray diffraction analysis and elemental analysis were used to characterize the synthetic methods of adsorbent. The synthetic adsorbent （PTFE fiber-q-magnetic zeolite） was made by im- pregnation,the magnetic zeolite＋PTFE fiber were modified respectively by adding 5% ,10% ,15% nitric acid solution. Ab- sorption of gas-phase mercury （Hg^0） in coal-fired flue gases by polyimide fiber cooperated with the magnetic zeolite were investigated in the fixed bed system. The results showed that when the inlet concentration of mercury was 45μg/ma ,the ad- sorption temperature 160℃, and quality ratio of the magnetic zeolite and PTFE fiber 2 ： 1, the highest Hg^0 removal efficiency was up to 76.5%. After the modification of 5%,10% HNO3 respectively, compared with the unmodified adsorbent, the Hg^0 removal rate increased by 3 % ,9 % ,and modification by 15 % HNO3 solution of adsorbent resulted in lower efficiency for mercury removal.
作者
王静泓
刁永发
Wang Jinghong Diao Yongfa(School of Environment Science and Engineering,Donghua University,Shanghai 201620)
出处
《化工新型材料》
CAS
CSCD
北大核心
2016年第12期147-149,共3页
New Chemical Materials
基金
国家"863"高新技术研究发展计划项目(2008AA05Z305)
上海市优秀技术带头人计划项目(14XD1424700)
中央高校基本科研业务费重点项目基金(11D11315)
