活性炭改性对滤嘴吸附性能的影响

Effect of the Modification of Activated Carbon on Adsorptive Performance of Activated Carbon Filters

采用物理吸附仪对活性炭孔结构及比表面积进行表征,运用Boehm滴定法分析了活性炭改性前后表面酸性和酸性分布,并用X射线能谱仪对活性炭氧化改性前后氧元素含量进行了半定量分析,以期揭示活性炭物理、化学性质对滤嘴吸附性能的影响。研究结果表明:随着滤嘴中活性炭添加量的增加,滤嘴对烟气的吸附性能越高,在不显著增加香烟吸阻的前提下,选择30mg/g为滤嘴中活性炭最佳添加量;活性炭比表面积越高、孔容越大、酸性越强,滤嘴对香烟主流烟气的吸附性能越好。与普通醋酸纤维滤嘴相比,HNO3改性活性炭的滤嘴对尼古丁和焦油的吸附能力分别提高25.6%和8.8%。

Pore texture and specific surface area of activated carbon were analyzed by sorptomatic instrument. Surface acidity and acidity distribution measured by Boehm titration and oxygen content of the activated carbon before and after modification analyzed semi-quantitatively by EDS were used to characterize the influence of physical and chemical properties of activated carbon on adsorption performance of filter. The results indicate that adsorption capacity of filter to smoking became high with increasing of the content of activated carbon in filter, and if the internal resistance of cigarette was maintained constant, the best content of activated carbon in filter was 30 mg/g. High specific surface area, larger pore volume and acidity of activated carbon could contribute to the excellent adsorption performance of filter to mainstream smoking of cigarette. The adsorption capacity of the filter to nicotin and tar were about 25.6% and 8.8% higher than that of filter containing common cellulose acetate.