Release-slowing mechanism of anisole on glucose-based porous carbon materials

doi:10.11949/j.issn.0438-1157.20170576

Abstract

Abstract:

Release-slowing mechanism of anisole desorption on glucose-based porous carbon materials was investigated. Porous carbon materials were prepared by using glucose as carbon source, and then characterized. Kinetic curves of anisole desorption on glucose-based porous carbon materials were measured. Model for estimating diffusion coefficient of anisole desorption from the carbon materials was established. Results showed that the specific surface area of the prepared samples reached as high as 1133-3153 m²·g⁻¹, and the anisole adsorption capacity of the adsorbents reached as high as 1050 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 release-slowing anisole from the samples. About 78%-83% of anisole desorbed from the porous carbons in the forms of Knudsen diffusion and surface diffusion.

Key words: carbon material, anisole, sustained-release material, desorption, diffusivity, diffusion mechanism

摘要：

选择葡萄糖为碳源制备了一种多孔碳材料，对材料进行孔隙结构表征，研究材料孔隙结构对茴香醚脱附扩散机制的影响。应用重量法测定茴香醚在不同吸附剂上的脱附动力学曲线，建立扩散系数D_e估算模型，然后计算出茴香醚在吸附剂上的扩散系数D_e（t）-q（t）关系曲线，根据扩散系数值的大小划分扩散机理区域，讨论吸附剂的孔隙结构对茴香醚在吸附剂材料上扩散机制的影响。研究结果表明，所制备样品的比表面积可达1133～3153 m²·g⁻¹，茴香醚在吸附剂上的吸附量可达到1050 mg·g⁻¹；茴香醚香料分子在3种材料上的脱附扩散都经历了一般扩散、Knudsen扩散和表面扩散。吸附剂的孔隙结构对茴香醚香料分子在材料上的脱附扩散机制有影响，其微孔比例越高，茴香醚分子在此吸附剂上以表面扩散机制进行脱附所占比例越高。茴香醚分子在3种吸附剂上的脱附均以Knudsen扩散和表面扩散为主，约占78%～83%。本研究成果对于指导香料物质缓释材料的制备具有实际指导和借鉴意义。

关键词: 碳材料, 茴香醚, 缓释材料, 脱附, 扩散系数, 扩散机理

CLC Number:

ZHOU Feng, LI Zhiyu, LI Gen, JIANG Tao, ZHE Wei, HUANG Yan, LU Zhenbao, LI Zhong. Release-slowing mechanism of anisole on glucose-based porous carbon materials[J]. CIESC Journal, 2017, 68(12): 4625-4632.

周枫, 李智宇, 李根, 江涛, 者为, 黄艳, 卢真保, 李忠. 茴香醚在葡萄糖基多孔碳材料上缓释机理[J]. 化工学报, 2017, 68(12): 4625-4632.

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