3.3. Intraparticle diffusion model
In order to investigate the mechanism of the MB adsorption onto
PS, intraparticle diffusion-based mechanism was studied. The most
commonly used technique for identifying the mechanism involved
in the adsorption process is by fitting an intraparticle diffusion plot.
It is an empirically found functional relationship, common to the
most adsorption processes, where uptake varies almost proportionally with t1/2 rather than with the contact time t. According to the
theory proposed by Weber and Morris [25]: