A rapid kinetic dye test to predict the adsorption of XXXX onto granular activated carbons and to identify the influence of pore volume distributions.

@entity23282 @entity15583 @entity6693 @entity38804 @entity1758 @entity505 @entity941 @entity9468
The authors have developed a kinetic dye test protocol that aims to predict the competitive adsorption of @entity38804 ( @entity1758 ) to granular activated carbons (GACs). The kinetic dye test takes about two hours to perform, and produces a quantitative result, fitted to a model to yield an @entity9468 ( @entity9468 ) during the earlier times of dye sorption. The dye @entity23282 orange was probed into six coconut-based GACs and five bituminous-based GACs that hosted varied pore distributions. Correlations between @entity23282 orange IDCs and breakthrough of @entity1758 at 4  ppt in rapid small-scale column tests (RSSCTs) were found with R(2)s of 0.85 and 0.95 for coconut carbons that processed waters with total organic @entity505 (TOCs) of 1.9 and 2.2  ppm, respectively, and with an R(2) of 0.94 for bituminous carbons that processed waters with a TOC of 2.5  ppm. The author sought to study the influence of the pore sizes, which provide the adsorption sites and the diffusion conduits that are necessary for the removal of those compounds. For coconut carbons, a linear correlation was established between the @entity23282 orange IDCs and the volume of pores in the range of 23.4-31.8     widths (R(2)  =  0.98). For bituminous carbons, best correlation was to pores ranging from 74 to 93     widths (R(2)  =  0.94). The differences in adsorption between coconut carbons and bituminous carbons have been attributed to the inherently dissimilar @entity15583 layering resulting from the parent materials and the activation processes. When @entity941 dye was employed in the kinetic dye tests, the correlations to @entity1758 performance were not as high as when @entity23282 orange was used. Intriguingly, it was the same pore size ranges that exhibited the strongest correlation for @entity1758 RSSCT's, @entity23282 orange kinetics, and fluoroscein kinetics. When @entity6693 dye was used, sorption occurred so rapidly as to be out of the scope of the @entity9468 model.
