PM2.5关键成核物--低挥发性化合物在多孔材料中的吸附特性研究

项目名称： PM2.5关键成核物--低挥发性化合物在多孔材料中的吸附特性研究

项目编号： No.51478038

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 其他

项目作者： 刘应书

作者单位： 北京科技大学

项目金额： 85万元

中文摘要： 低挥发性化合物（LVC）是PM2.5形成过程中的关键物质，吸附捕获LVC对于PM2.5污染的治理具有重要研究意义。本课题拟对气态硫酸、芳香酸、多环芳烃等典型LVC及其与超细颗粒物共存时在介孔分子筛、改性活性炭、吸附树脂、硅胶独石等多孔材料上的吸附特性开展研究。采用重量法及TPD技术测量LVC在多孔材料中的饱和吸附量及脱附活化能，获取吸附等温线，建立吸附模型；基于多种先进表征手段测试多孔材料的材质特性及孔道特性，研究其对LVC吸附性能的影响；构建LVC与超细颗粒物共存的吸附实验系统，利用场发射扫描电镜（FESEM）观测超细颗粒在多孔材料中的沉积状态，研究共存条件下LVC的吸附特性。旨在获得单组分及多组分LVC在多孔材料上的吸附基础数据，确立LVC吸附模型及相关参数，明确多孔材料材质、孔道特性及超细颗粒物对LVC吸附特性的影响规律。研究成果可为PM2.5治理方法的选择提供参考。

中文关键词： PM2.5；低挥发性化合物；吸附；多孔材料；超细颗粒物

英文摘要： Low volatility compounds(LVC) are the critical substance in the formation of PM2.5. To adsorb and capture LVC would have great significance for PM2.5 control. The aim of this study is to investigate the adsorption characteristics of some representative LVCs（sulfuric acid, aromatic acids and polycyclic aromatic hydrocarbons） on porous materials (mesoporous molecular sieves, modified activated carbons, adsorptive resins and silica monoliths), with and without existence of ultrafine particles(UFPs, dp<200nm), respectively. Adsorption isotherms and adsorption models of LVC are to be obtained through the adsorption capacity and desorption activation energy measured by gravimetric method and TPD technique, respectively. Then, the influence of porous materials characteristics on LVC adsorption performance will be studied, in terms of the texture and pore information measured by several advanced materials characterization methods. Furthermore, the experiment system of LVCs co-existed with UFPs will be established. The influence of UFPs on LVC adsorption performance will be studied by UFPs deposition in porous materials observed by field emission scanning electron microscopy(FESEM). Based on the work above, we can get the adsorption basic data of monocomponent and multicomponent LVC over porous materials, as well as the influence rule of the texture, pore characteristics of porous materials and the coexisting UFPs upon the LVC adsorption. The research results can provide reference for selecting PM2.5 control methods.

英文关键词： PM2.5;low volatility compounds;adsorption;porous materials;ultrafine particles