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为开发卷烟减害新材料,向琼脂基质中加入不同量的纳米SiO2,采用溶胶-凝胶法制备了系列琼脂-纳米SiO2气凝胶材料,对材料形貌和微结构进行了表征;采用模拟烟气吸附试验考察了材料对巴豆醛的吸附效果,并通过二元复合滤棒的形式考察了Agar-SiO2-60% (气凝胶中纳米SiO2的质量分数为60%)在卷烟滤嘴中的应用效果.结果表明:①该材料呈三维网络多孔结构,比表面积为73.62~424.75 m2/g,平均孔径为23.46~10.38 nm.②当气凝胶中纳米SiO2的质量分数从0依次增加到20%、40%、60%、80%时,琼脂-纳米SiO2气凝胶对巴豆醛的吸附量从1.65 mg/g依次增加到3.13、4.35、8.91、13.80 mg/g.③卷烟滤棒中Agar-SiO2-60%添加量为30 mg/支时,试验卷烟主流烟气常规指标基本无变化,有害成分NNK、NH3以及巴豆醛释放量较对照卷烟分别降低12.8%、11.3%和9.5%,烟气危害性指数降低0.6,且感官品质未下降.“,”In order to develop new materials for reducing harmful components in cigarette smoke, a series of agar-nano-SiO2 aerogels was prepared by agar matrix and nano-SiO2 powder through a sol-gel process. The morphology and microstructure of the aerogels were characterized, the adsorption property of the aerogels to crotonaldehyde in the simulated smoke was studied, and the application effect of the agar-SiO2-60% (the mass fraction of nano-SiO2 in aerogel was 60% ) in the cigarette filter was investigated. The results showed that: 1) The agar-nano-SiO2 aerogels presented three-dimensional network porous structure with a specific surface area of 73.62-424.75 m2/g and the average pore size of 23.46-10.38 nm. 2) The amount of adsorbed crotonaldehyde increased from 1.65 mg/g to 3.13, 4.35, 8.91 and 13.80 mg/g when the mass fraction of nano-SiO2 in aerogels increased from 0 to 20% , 40% , 60% and 80% , respectively. 3) When agar-SiO2-60% was added to the dual-segment filtered cigarette at a rate of 30 mg/cig, the effects on the release of tar, nicotine and CO were negligible, and the release of NNK, NH3 and crotonaldehyde was reduced by 12.8% , 11.3% and 9.5% , respectively. The overall hazard index of the test cigarette was decreased by 0.6, and the sensory quality of cigarette was unchanged.