Donnan Electric Potential Dependence of Intraparticle Diffusion of Malachite Green in Single Cation Exchange Resin Particles: A Laser Trapping-Microspectroscopy Study
Donnan Electric Potential Dependence of Intraparticle Diffusion of Malachite Green in Single Cation Exchange Resin Particles: A Laser Trapping-Microspectroscopy Study
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DOI：
10.4236/ajac.2012.33027
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
N. Cuong;S. Ishizaka;N. Kitamura
中科院分区：
文献类型：
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作者：
N. Cuong;S. Ishizaka;N. Kitamura
采用激光捕获-显微光谱技术，结合荧光阳离子染料(罗丹明B，Rb+)到非荧光阳离子染料(孔雀石绿，MG+)的激发能转移，研究了pH对直径为16μm的单一阳离子交换树脂微粒中MG+(D(MG+))扩散系数的影响。然后利用Rb+被MG+猝灭效率的时间历程来估算颗粒中的D(MG+)值。溶液pH值从9增加到4时，D(MG+)值从1.1×10-11增加到4.3×10-11cm2.s-1。用Donnan电位模型对结果进行了合理解释。
A laser trapping-microspectroscopy technique combined with excitation energy transfer from a fluorescent cationic dye (Rhodamine B, RB+) to a non-fluorescent cationic dye (Malachite Green, MG+) was employed to study pH effects on the diffusion coefficients of MG+ (D(MG+)) in single cation-exchange resin microparticles with the diameters of 16 μm. When RB+-pre-adsorbed resin particles were soaked in an aqueous MG+ solution, the RB+ fluorescence was quenched gradually with the soaking time. The time course of the quenching efficiency of RB+ by MG+ was then used to evaluate the D(MG+) value in the particle. The D(MG+) value increased from 1.1 × 10-11 to 4.3 × 10-11 cm2.s–1 on going the solu- tion pH value from 9 to 4. The results were explained reasonably by a Donnan electric potential model.