模拟三甘醇附着对黑碳气溶胶吸湿性的影响

发布时间：2018-04-11 22:21

本文选题：黑碳气溶胶 + 吸湿性　；参考：《中国环境科学》2017年04期

【摘要】：为研究黑碳气溶胶粒子在附着三甘醇后吸湿性的变化,通过采用反向扩散燃烧器制取黑碳气溶胶,并运用自主搭建的吸湿性串联差分电迁移率分析仪对黑碳气溶胶进行粒径筛选、热消解和三甘醇附着,同时结合扫描电镜仪和气溶胶质量分析仪观察分析黑碳气溶胶在附着三甘醇前后形态结构和吸湿性的变化.分别筛选粒径为100,200,300nm的黑碳气溶胶粒子进行了三甘醇附着模拟实验.实验结果表明,三甘醇附着能够改变黑碳气溶胶粒径和吸湿特性,在相同条件下黑碳气溶胶附着少量三甘醇后就能出现显著的粒径变化.u6于三甘醇具有一定的吸水性且其表面张力小于相同室温条件下水的表面张力,因此附着了三甘醇的黑碳气溶胶在不同相对湿度条件下将会发生进一步的粒径变化.因而,大气中少量存在的三甘醇能够在一定程度上促进黑碳气溶胶微物理特性的改变,进而改变黑碳气溶胶对大气环境的影响.
[Abstract]:In order to study the hygroscopicity of black carbon aerosol particles attached to triethylene glycol, black carbon aerosols were prepared by reverse diffusion burner.The particle size of black carbon aerosol was screened by self-built hygroscopicity series differential mobility analyzer, thermal digestion and attachment of triethylene glycol were carried out.The changes of morphology and hygroscopicity of black carbon aerosol before and after the attachment of triethylene glycol were observed by SEM and aerosol quality analyzer.Black carbon aerosol particles with particle size of 100200300nm were selected for triethylene glycol attachment simulation experiment.The experimental results show that the adsorption of triethylene glycol can change the particle size and moisture absorption characteristics of black carbon aerosol.Under the same conditions, the black carbon aerosol can exhibit significant particle size change after a small amount of triethylene glycol is attached. U6 has a certain water absorption and its surface tension is less than that of water at the same room temperature.Therefore, the black carbon aerosols with triethylene glycol will have further particle size changes under different relative humidity.Therefore, a small amount of triethylene glycol in the atmosphere can promote the change of the microphysical properties of black carbon aerosol to some extent, and then change the influence of black carbon aerosol on the atmospheric environment.
【作者单位】：南京信息工程大学环境科学与工程学院江苏省大气环境监测与污染控制高技术重点实验室江苏省大气环境与装备技术协同创新中心江苏省环境净化材料工程技术研究中心;美国新泽西理工学院;
【基金】：国家自然科学基金资助项目(21577065,91543115) 科技部国际合作专项(2014DFA93780) 环保行业专项(201409027) 江苏省科技支撑1101(SBE2014070928,BE2014602),PAPD 美国National Science Foundation(1463702)
【分类号】：X513

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