Modeling Selenite Breakthrough with the Pore Surface Diffusion Model in Iron Coated Granular Activated Carbon Packed Bed Columns

For comparing the adsorption of Synthetic Organic Chemicals (SOC) competing with background pollutants between a bifunctional resin and a commercial granular activated carbon (GAC), tannic acid (TA) was preloaded to the two adsorbents at quantities of 60 and 120 μmol/g. As a result, decreases of micropores volume in the resin were 75.5 and 98.9%, while those in the GAC were only 19.0 and 30.0%, respectively. Preloading attenuated surface heterogeneities and phenol’s capacities of two adsorbents distinctly. But maximumly, 1.0 mole TA’s preloading on GAC could decline 9.23 mole phenol’s adsorption. Under the same condition, the resin’s capacity of phenol was only descended at 2.68 times, when 98.9% micropores have been blocked. In kinetic tests, blockages in the resin were misapprehended to be much lighter than those in the GAC by the Homogeneous Surface Diffusion Model (HSDM). One steady operation engineering at micropore volume 37.8% decline was introduced. The conflicts were explained by quite a number of resin’s functional groups in the macroporous and mesoporous region could attract enough phenol molecular rapidly, even if almost all micropores were blocked.

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Application of granular activated carbon packed-bed reactor in microwave radiation field to treat phenol

Chemosphere ◽

10.1016/s0045-6535(98)00432-9 ◽

1999 ◽

Vol 38 (11) ◽

pp. 2667-2680 ◽

Cited By ~ 43

Author(s):

Hua-Shan Tai ◽

Chih-Ju G. Jou

Keyword(s):

Activated Carbon ◽

Radiation Field ◽

Microwave Radiation ◽

Granular Activated Carbon ◽

Packed Bed ◽

Packed Bed Reactor

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Adsorption Characteristics of Humic Acids by Granular Activated Carbon

Adsorption Science & Technology ◽

10.1177/026361749701500704 ◽

1997 ◽

Vol 15 (7) ◽

pp. 507-516 ◽

Cited By ~ 1

Author(s):

S.H. Lin ◽

C.M. Lin

Keyword(s):

Activated Carbon ◽

Humic Acid ◽

Surface Diffusion ◽

Humic Acids ◽

Granular Activated Carbon ◽

Model Parameters ◽

Adsorption System ◽

Transfer Resistance ◽

Liquid Phase Mass Transfer ◽

Continuous Adsorption

The adsorption of humic acids on granular activated carbon has been investigated. A commerically available humic acid and that extracted from the bottom sludge of a dam were employed in the studies. Both batch and continuous adsorption experiments were conducted. A simplified competitive adsorption model in conjunction with the Freundlich isotherm was employed to represent the batch multicomponent adsorption system and a homogeneous surface diffusion model utilized to describe the continuous adsorption system in a packed-bed column. The model parameters were obtained by best fit of the models to the experimental adsorption data. The results indicated that the liquid-phase mass-transfer resistance, surface diffusion coefficient and the amount of adsorption on the activated carbon decreased with increasing molecular weight of the humic acid. It was also found that the adsorption of humic acid on the activated carbon was primarily a surface diffusion-controlled process.

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