Adsorption behaviour of methylene blue onto Jordanian diatomite: A kinetic study

The maximum uptake capacity seems to be independent of the particle size of the diatomite when the particle size distribution is less than 250-500 μm. While at larger particle size 250-500 μm, the maximum uptake capacity was dependent on the particle size. It would imply that the MB adsorption is limited by the external surface and that intraparticle diffusion is reduced. The effect of the agitation speeds on the removal of MB from aqueous solution using the diatomite is quite low. The MB removal increased from 43 to 100% when mass of the diatomite increased from 0.3 to 1.7 g.