Application Of Adsorption Of Atmospheric Haze Particles Based On Electret Material

In recent years, the continued and deteriorated fog and haze has become the main environmental problems facing our country, which not only brings serious impact to the health of human beings, but also to the power transport. As the concentration of particulate matter increases in the air because of fog and haze, the pollution particles become more easily to be enriched in the transmission system insulation material surface by the action of static electricity, and that also produces corrosion degradation to the insulation material. Now, in this thesis, we studied the fouling characteristics and the influence of fog and haze particles on the surface of insulation materials in the micro nano scale. In addition, we also developed a method of sampling and filtering air pollution particulate matter based on pyro-electric material, which rely on the electrostatic adsorption effect. The main contents of this paper include the following three parts:(1) Firstly, through haze weather and simulated haze weather, we concluded that the silicone rubber surface produced corrosion degradation and cracking by the combined effects of water, soluble salt and acid gas on the surface of silicone rubber caused by the long-term exposure to fog and haze. Furthermore, these crackles also make silicone rubber's dielectric constant decrease and dielectric loss increase.(2) Secondly, most of the fine particles in the atmosphere are polar particles, which are easier to be deposited on the surface of material under the action of static electricity. Therefore, the electrostatic adsorption effect can be used to adsorb and filter the fine particles. In this chapter, we firstly obtained polyvinyl fluoride which has pyro-electric effect by modification. Then, we studied its application in adsorption of fine particulate matter in the atmosphere.(3) Compared with poor temperature resistance and high dielectric loss of the pyro-electric polymer, the inorganic pyro-electric material lithium niobate has a good performance in high pyro-electric coefficient?heat-resisting and resistance loss. Thus, we frist collect fine particles in fog and haze weather by lithium niobate through giving it a temperature stimulation. Second, we analyzed these collected particles size and composition by SEM and ICP-MS. Finally, the results show that the composition of particles collected by lithium niobate are in agreement with report, and this method also have a high efficiency in absorbing fine particles in the air. In summary, the pyro-electric effects of LN have higher efficiency, low cost and long service life, especially in the capturing of nano-sized PM, which show great prospect in sampling and purification of atmospheric haze.