Direct Analysis of Intraparticle Mass Transfer in Silica Gel Using Single-Microparticle Injection and Microabsorption Methods
Direct Analysis of Intraparticle Mass Transfer in Silica Gel Using Single-Microparticle Injection and Microabsorption Methods
复制标题
使用单微粒注射和微吸收方法直接分析硅胶中的颗粒内传质
DOI：
10.1021/la000885s
复制
发表时间：
2000
期刊：
影响因子：
3.9
通讯作者：
Tomomi Sekine
中科院分区：
文献类型：
--
作者：
Kiyoharu Nakatani and;Tomomi Sekine
用微毛细管操作/进样和微吸收方法研究了阳离子染料在水溶液中在单个硅胶微粒中的吸附和解吸过程。染料在颗粒内部的扩散限制了罗丹明6G的吸附和解吸速率。亚甲基蓝的解吸速率慢于吸附速率，且速率决定步骤不是染料的扩散。从颗粒内扩散和缓慢脱附两个方面讨论了染料的吸附和脱附过程。
Sorption and desorption processes of cationic dyes occurring in single silica gel microparticles in an aqueous solution were kinetically studied by microcapillary manipulation/injection and microabsorption methods. The sorption and desorption rates of rhodamine 6G were limited by diffusion of the dye in the particle interior. For methylene blue, the desorption rate was slow compared with the sorption rate, and the rate-determining step was not the diffusion of the dye. The sorption and desorption processes of the dyes were discussed in terms of intraparticle diffusion as well as of that accompanied by slow desorption.