| Summary: | 碩士 === 國立成功大學 === 化學工程研究所 === 77 ===
The kinetics for adsorption reaction between the spher-ical resin beads and solution have been studied. In this work, we proceed the adsorption reaction by using weak base anion exchange resins, in the free base form of Amberlite IRA-94, as adsorbent, and p-chlorophenol as adsorbate.
The kinetic mechanism of adsorption reaction that is considered in representing single component adsorption may include: (1)film diffusion from the fluid phase to the surface of the partical; (2) adsorption on the surface; and (3) intraparticle diffusion.
Under the intraparticle diffusion-controlled kinetics, four variables including: adsorbate concentration of the solu-tion, pH value, particle size, and reaction temperature have been investigated in order to understand the effect of each on the adsorption rate. Besides, the rate equation of intraparticle diffusion is described by Pick's second law with a Langmuir adsorption isotherm, and is solved by numerical method to obtain the adsorption rate.
The apparent diffusivites De at various condition are determined by Comparing the experimental data with theoretical data, we can find that the apparent diffusivity is not affected by particale size, but increases with incraesing temperature , pH value and initial concentration of solution. The activation energy for intraparticle diffusion (Ea)De can be obtained from the relationship between De and temperature.
From the experimental result, we can find that the adsorption rate increases with increasing temperature, initial concentration, pH value, but decreases with increasing particle size.
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