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

Journal of the Serbian Chemical Society

Markovska Ljiljana T.¹  Marinkovski Mirko S.¹  Meshko Vera D.¹ 

[1] Faculty of Technology and Metallurgy, University 'Sts Cyril & Methodius', Skopje;

关键词: zinc;    adsorption;    granular activated carbon;    natural zeolite;    equilibrium;    kinetic modeling;    homogeneous solid diffusion model;   

DOI  :  10.2298/JSC0609957M

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown