Kinetic models intra-particle diffusion, rates

Batch kinetic data on the removal of reactive dye from solution using thermally chaired dolomite have been well described by empirical external mass transfer and intra-particle diffusion models. It was found that external mass transfer and intra-particle diffusion had rate limiting effects on the removal process which were attributed to the relatively simple... 

The kinetic data for the adsorption of Hg(II) by the copolymer satisfactorily follow both the pseudo-second-order model (where linear plots of t vs t/qt) as well as intra-particle diffusion model (up to 3h after that data does not satisfy intra-particle diffusion model, indicating that adsorption in the beginning is diffusion controlled. The correlation coefficients (R ) and the rate constants for CJ-g-PAA are shown in Table 10.4. While the isotherm studies indicate unilayer... 

Ostrovskii and Bukhavtsova published several experimental and theoretical works on capillary condensation in catalytic reactions. Capillary condensation was found to accompany some gas-phase catalytic processes, in particular hydrotreating of jet fuel fractions [7]. The effects of gas-liquid interfacial surface, intra-particle diffusion, and of the ratio of gas to liquid reaction rates under conditions of capillary condensation were estimated [8]. The experimental study of /j-xylene hydrogenation on Pt/Si02 (as a model reaction) was carried out in order to demonstrate the influence of capillary condensation on reaction kinetics and process dynamics, and corresponding model was proposed [9]. Finally, the poisoning of the catalyst under capillary condensation was also considered [10]. 

A wastewater treatment technique has been investigated, for reactive dye removal, in batch kinetic systems. Results indicate that chatted dolomite has the potential to act as an adsorbent for the removal of reactive dye fiom aqueous solution. The effect of initial dye concentration, adsorbent mass liquid volume ratio, and agitation speed on removal have been deteimined with the experimental data mathematically described using empirical external mass transfer and intrai>article diffusion models. The experimental data show conformity with an adsorption process, with the removal rate heavily dependent on both external mass transfer and intra-particle diffesion. 

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