What is intraparticle diffusion?
An intraparticle diffusion rate parameter has been defined characteristic of the rate of diffusion after the early stages of the adsorption. The rate parameter has been determined for a number of variables including adsorbent mass, initial dye concentration, and particle size.
What is intraparticle?
Intraparticle describes processes which happen in a solid particle. As particle size becomes bigger, intraparticle resistances to heat and mass transfer eventually begin to dominate. Intraparticle pores are pores within the particle. Intraparticle describes processes which happen in a solid particle.
What is pore diffusion model?
In the pore diffusion model, diffusion is assumed to take place in the liquid-filled pores. The driving force for intraparticle mass transfer is solute concentration gradient in the pore phase of the particle.
What is intraparticle porosity?
The Inter-particle porosity are the large pores between particles while the Intra-particle porosity are the smaller pores within the particle.
What is elovich kinetic model?
Abstract. The Elovich equation has been widely used in adsorption kinetics, which describes chemical adsorption (chemical reaction) mechanism in nature. The approaching equilibrium parameter of Elovich equation (RE) was used here to describe the characteristic curves of adsorption kinetics.
Where does pore diffusion occur?
The movement of fluids (gas or liquid) into the interstices of porous solids or membranes; occurs in membrane separation, zeolite adsorption, dialysis, and reverse osmosis.
What is Tracer diffusion?
Tracer diffusion, which is a spontaneous mixing of molecules taking place in the absence of concentration (or chemical potential) gradient. This type of diffusion can be followed using isotopic tracers, hence the name.
What is intercrystalline porosity?
Intercrystalline Porosity. This type of porosity is formed in the existing space among the dolomite crystals (Figure 3(a)) and their geological origin is from sabkha to open marine. This porosity is one of the best spaces for gas reserves in the gas field. 4.1.2.
What is formation porosity?
Porosity is defined as the ratio of the volume of pores to the volume of bulk rock and is usually expressed as a percentage.
What is elovich equation?
One of the most useful models for describing such activated chemical adsorption is the Elovich equation [2], which is given by(1) d q t d t = a exp ( − b q t ) where a and b are constants during any an experiment. The constant a is regarded as the initial rate because (dqt/dt) approaches a when qt approaches 0.
What causes molecular diffusion?
7.5. The molecular diffusion coefficient is caused by the random thermal motion of molecules in a gas or liquid and depends on the temperature and pressure, molecular properties, such as mass and volume, and the forces between molecules.