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.…”

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.…”

Kinetic Modeling of the Adsorption of Basic Dyes onto Steam-Activated Bituminous Coal

“…Walker and Weatherley attributed the decrease in diffusivity, D , with increased dye concentration to dye agglomeration at high bulk liquid concentrations, which would increase the diffusional resistance. Al-Duri and McKay explained the increase in D with initial dye concentration to a decrease in bonding energies. As surface coverage increases, bonding energy decreases due to the progressive filling of adsorption sites of decreasing energy.…”

Review on decolorisation of aqueous dye solutions by low cost adsorbents

“…The pith, which is a soft and porous material with a large surface area, in the centre of stalks, has twice the adsorptive capacity of skin which is cellulose-based with a layered fibrous structure. The adsorption rates of two basic dyestuffs (Methylene Blue and CI Basic Red 9) studied was much higher than that of the direct dyes (Congo Red and CI Direct Blue 71) with almost 80% removal within 30 min [66,67]. Chemical modification of sunflower stalks with cationic groups dramatically increases their adsorption of anionic dyestuffs.…”

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.…”

Kinetic Modeling of the Adsorption of Basic Dyes onto Steam-Activated Bituminous Coal

“…Walker and Weatherley attributed the decrease in diffusivity, D , with increased dye concentration to dye agglomeration at high bulk liquid concentrations, which would increase the diffusional resistance. Al-Duri and McKay explained the increase in D with initial dye concentration to a decrease in bonding energies. As surface coverage increases, bonding energy decreases due to the progressive filling of adsorption sites of decreasing energy.…”

Review on decolorisation of aqueous dye solutions by low cost adsorbents

“…The pith, which is a soft and porous material with a large surface area, in the centre of stalks, has twice the adsorptive capacity of skin which is cellulose-based with a layered fibrous structure. The adsorption rates of two basic dyestuffs (Methylene Blue and CI Basic Red 9) studied was much higher than that of the direct dyes (Congo Red and CI Direct Blue 71) with almost 80% removal within 30 min [66,67]. Chemical modification of sunflower stalks with cationic groups dramatically increases their adsorption of anionic dyestuffs.…”

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.…”

Kinetic Modeling of the Adsorption of Basic Dyes onto Steam-Activated Bituminous Coal

“…Walker and Weatherley attributed the decrease in diffusivity, D , with increased dye concentration to dye agglomeration at high bulk liquid concentrations, which would increase the diffusional resistance. Al-Duri and McKay explained the increase in D with initial dye concentration to a decrease in bonding energies. As surface coverage increases, bonding energy decreases due to the progressive filling of adsorption sites of decreasing energy.…”

Review on decolorisation of aqueous dye solutions by low cost adsorbents

“…The pith, which is a soft and porous material with a large surface area, in the centre of stalks, has twice the adsorptive capacity of skin which is cellulose-based with a layered fibrous structure. The adsorption rates of two basic dyestuffs (Methylene Blue and CI Basic Red 9) studied was much higher than that of the direct dyes (Congo Red and CI Direct Blue 71) with almost 80% removal within 30 min [66,67]. Chemical modification of sunflower stalks with cationic groups dramatically increases their adsorption of anionic dyestuffs.…”