Modeling of the adsorption kinetics of zinc onto granular activated carbon and natural zeolite

Abstract

The isotherms and kinetics of zinc adsorption from aqueous solution onto granular activated carbon (GAC) and natural zeolite were studied using an agitated batch adsorber. The maximum adsorption capacities of GAC and natural zeolite towards zinc(II) from Langmuir adsorption isotherms were determined using experimental adsorption equilibrium data. The homogeneous solid diffusion model (HSD-model) combined with external mass transfer resistance was applied to fit the experimental kinetic data. The kinetics simulation study was performed using a computer program based on the proposed mathematical model and developed using gPROMS. As the two-mass transfer resistance approach was applied, two model parameters were fitted during the simulation study. External mass transfer and solid phase diffusion coefficients were obtained to predict the kinetic curves for varying initial Zn(II) concentration at constant agitation speed and constant adsorbent mass. For any particular Zn(II) - adsorbent system, k f was constant, except for the lowest initial concentration, while D s was found to increase with increasing initial Zn(II) concentration.

Effective heterogeneous electro-Fenton process of m-cresol with iron loaded actived carbon

“…[1][2][3][4] In addition, cresols are extensively used in resin manufacturing, pharmaceuticals, pesticides, tri-cresylic acid and surfactants, therefore they are released in the wastewaters from those industries. Several processes have been developed for the treatment of phenol polluted wastewaters: biodegradation, 5,6 conventional physico-chemical methods such as adsorption, 7,8 and conventional advanced oxidation processes (AOPs) such as photodegradation, 9,10 Fenton oxidation 1,11 and their combinations. Several processes have been developed for the treatment of phenol polluted wastewaters: biodegradation, 5,6 conventional physico-chemical methods such as adsorption, 7,8 and conventional advanced oxidation processes (AOPs) such as photodegradation, 9,10 Fenton oxidation 1,11 and their combinations.…”

Adsorption of Zinc on Cassava Peels Activated Carbon and Kaolin Clay: Kinetics, Thermodynamics and Optimization Studies.

“…The kinetics model of the adsorption was investigated using the pseudo first and second order kinetic model shown in (6) and (7).…”

“…This is basically due to less investment in terms of cost, simple and easy operation [6]. Adsorption involves the use of solid materials known as the adsorbents that have internal pores where the molecules to be removed will be attached.…”

The uranium recovery from aqueous solutions using amidoxime modified cellulose derivatives. I. Preparation, characterization and amidoxime conversion of radiation grafted ethyl cellulose-acrylonitrile copolymers

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