Many kinds of compounds in cigarette smoke can effect human health，and some may be carcinogenic or mutagenic to humans. The adsorb materials in cigarette filters are important for the reduction of the harmful compounds in cigarette smoke. In this study, we present a functional composite aerogels, a series of N-C-SiO2 composite aerogels with different nitrogen content are prepared via one step sol-gel technique. The porosity of N-C-SiO2 composite aerogels depends on the content of chitosan and the calcining procedure. Nitrogen atoms are successfully introduced into silica aerogels through carbon atoms and the N-C-SiO2 composite aerogels possess higher specific surface area (681 m2 /g). We sandwich the composite aerogels in the acetate filter rod of control samples to get a sandwich structure filter and the control samples named Hong Shuang Xi are purchased from market. The cigarettes with composite filters and control samples are smoked in a smoking machine, and the mainstream smoke is collected and analyzed. Seven kinds of compounds include carbonyls (formaldehyde, acetaldehyde, acetone, propaldehyde, crotonaldehyde, 2-butanone, butyraldehyde), CO, HCN，benzo[a]pyene, ammonia, NNK and phenol examined in our study. The removal efficiency of composite filter for seven kinds of compounds in cigarette smoke is calculated as a formula (Removal efficiency = (Vsample – Vcontrol) / Vcontrol). Totally, the composite filter shows high removal efficiency for seven kinds of compounds, especially for carbonyls and the removal efficiency for crotonaldehyde is 75.9% . Sensory evaluation test shows the aroma of the sample with composite filter is smoother and softer than the control cigarette. The N-C-SiO2 composite aerogels have a good application prospect in cigarette smoke filtration.

One step synthesis of N-C-SiO2 composite aerogels and their adsorption property for cigarette smoke

2019 Spring National Meeting

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