Basic dye adsorption on carbon using a solid-phase diffusion model

Kinetic and equilibrium modelling of MTBE (methyl tert-butyl ether) adsorption on ZSM-5 zeolite: Batch and column studies

“…This may be due to that the increasing MTBE concentration increased the surface loading, thereby leading to an 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 18 increase of adsorbate mobility and a decrease of the adsorption energy [17]. This fell well within the magnitudes for chemisorption system (10 -5 to 10 -13 cm 2 ·s -1 ) [46]. Since surface diffusion and pore diffusion act in parallel and competitively, the faster process dominates and determines the total adsorption rate.…”

Thermodynamic behaviour and the effect of temperature on the removal of dyes from aqueous solution using modified diatomite: A kinetic study

“…The value of the intraparticle diffusion coefficient of RB is higher. This effect could be attributed to (i) the polar properties, which cause ionic interaction between the dye molecules and the MOMD surface hence slowing the rate of diffusion of MB and RY; (ii) the molecular size and branching; RB molecules may has less branching than RY and MB, hence RB is higher to diffuse [19]; and (iii) aggregation effect, in particular, MB exhibits an aggregation behaviour which could block the pores and therefore reduce the intraparticle diffusion coefficient. Therefore, MB diffusion within MOMD can be hampered, as a result of the aggregation of the dye molecules.…”

Adsorption isotherm models for basic dye adsorption by peat in single and binary component systems

“…This expression is characterized by the heterogeneity factor, b f , and so the Freundlich isotherm may be used to describe heterogeneous systems [33][34][35]. Theoretically, using this expression, an infinite amount of adsorption can occur [28].…”