【摘要】 分子筛膜的脱附困难是制约纳米分子筛敏感膜传感器发展的主要技术瓶颈之一,传统的高温脱附和纯氮气吹洗的方法无法有效地使纳米分子筛膜得到再生。针对Silicalite—1,ZSM—5和Cu-ZSM—5 3种纳米分子筛,利用石英晶体微天平(QCM)技术,研究了氮气吹洗法、高温脱附法和高频交变电场脱附法对甲基磷酸二甲酯(DMMP)气体的脱附特性。结果显示:超声频交变电场脱附法可以使脱附时间从传统方法的20 min缩短到60 s以内,并达到85%以上的脱附率,使传感器的重复性很快得到再现。更多还原

【Abstract】 The difficulty of desorption of dimethylmethylphosphonate(DMMP)gas is one of the key technical bottleneck which restrict the development of nano-zeolite sensitive membrane.The traditional desorption method such as high-temperature desorption and blow nitrogen to dry can not effectively make the nano-zeolite films regeneration.A novel desorption method for strong polar molecule DMMP using high frequency alternate electric fields is proposed.Three kinds of nano-zeolites,Silicalite—1,ZSM—5 and Cu-ZSM—5 with different size and microstructure are synthesized.The result shows that the desorption time decreases from 20 min to 60 s and the ratio of desorption up to 85 % by using the method with the high frequency alternate electric field against traditional desorption methods.更多还原