Release-slowing mechanism of anisole on glucose-based porous carbon materials
(2.Technology Center of China Tobacco Yunnan Industrial Co., Ltd., Kunming, Yunnan, China 650202)
(3.Guangzhou Huafang Tabacoo Flavors Company, Guangzhou, Guangdong, China 510530)
【Abstract】The release-slowing mechanism of anisole desorption on glucose-based porous carbon materials was investigated. The porous carbon materials were prepared by using glucose as carbon source, and then characterized. The kinetic curves of anisole desorption on glucose-based porous carbon materials were measured. The model for estimating diffusion coefficient of anisole desorption from the carbon materials was established. The results showed that the specific surface area of the prepared samples reached as high as 1 133–3 153 m2·g−1, and the anisole adsorption capacity of the adsorbents reached as high as 1 050 mg·g−1. Anisole desorption from the samples took place by mechanism of bulk diffusion, Knudsen diffusion and surface diffusion. The textural structure of the porous carbons had influence on the diffusion mechanism of anisole desorption. The high proportion of micropores would make the more anisole molecules desorb in the form of surface diffusion. Knudsen diffusion and surface diffusion played an important role in anisole release-slowing from the samples. About 78%–83% of anisole desorbed from the porous carbons in the forms of Knudsen diffusion and surface diffusion.
【Keywords】 carbon material; anisole; sustained-release material; desorption; diffusivity; diffusion mechanism;
(Translated by CHENG QZ)
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