Evaluation of surface and film diffusion coefficients for carbon adsorption

Traegner, U.K.; Suidan, Makram T.

doi:10.1016/0043-1354(89)90091-2

Cited by 66 publications

(64 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…respectively. Both systems were modeled by a homogeneous Surface diffusion model (HSDM) which is one of the most widely used models for activated carbons Wang and Roy, 1993;Traegner and Suidan 1989;Thacker et al, 1981). adsorbent, and local equilibrium occurs at the external surfice of an adsorbent particle and can be described by a Freundlich isotherm Equations descniing this model are (Thacker et al, 1981): …”

Section: Discussionmentioning

confidence: 99%

“…Adsorption processes both in batch and column systems have been successllly modeled by the HSDM (Traegner and Suidan 1989;Thacker et al, 1981). The HSDM is based on the following assumptions: The adsorbent is a homogenous spherical particle, intraparticle transport can be described by surface or solid diffusion, Iiquid-difEbsion resistance (liquid f i l m ) exists at the external surface of the adsorbent, and local equilibrium occurs at the external surface of an adsorbent particle and can be descriied by a Freundlich isotherm.…”

Section: Adsorption Modeling For Batch and Columnmentioning

confidence: 99%

“…Among these diffusion model, the homogeneous solid surface diffusion model (HSDM) is one of the most widely used models for activated carbons (Thacker et al, 1981;Traegner and Suidan 1989;Wang and Roy, 1993;Roy et al, 1993).…”

Section: External Diffusion (Or Film D235sion)mentioning

confidence: 99%

See 2 more Smart Citations

Development and evaluation of Mn oxide-coated composite adsorbent for the removal and recovery of heavy metals from coal processing wastewater. Final report, December 1995

Fan¹,

Anderson²

1995

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Section: Adsorption Modeling For Batch and Columnmentioning

confidence: 99%

See 1 more Smart Citation

Development and evaluation of Mn oxide-coated composite adsorbent for the removal and recovery of heavy metals from coal processing wastewater. Final report, December 1995

Fan¹,

Anderson²

1995

View full text Add to dashboard Cite

“…In a mixed system, the transport rate is usually limited by film diffusion and internal surface diffusion. For such systems, the homogeneous surface diffusion model (HSDM) can be used to describe the adsorption process (Weber and Chakravorty 1994;Roy et al 1993;Traegner and Suidan 1989;Najm 1996). Table 1 shows basics equations and initial and boundary conditions involved in HSDM theory for closed batch adsorption.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…Morris and Weber (1964;1969) presented a considerable amount of data on the adsorption of phenol, sodium salts of sulfonated organics, and pesticides. The kinetics of adsorption of organics on activated carbon have also been extensively studied by a number of investigators (Weber and Chakravorty 1974;Traegner and Suidan 1989;Roy et al 1993;Najm 1996;Knappe et al 1998). Research has also been undertaken showing that the combination of MF/UF with coagulation or carbon adsorption could be very effective for organic removal in tertiary wastewater or drinking water treatment.…”

mentioning

confidence: 99%

Assessment of Trace Estrogenic Contaminants Removal by Coagulant Addition, Powdered Activated Carbon Adsorption and Powdered Activated Carbon/Microfiltration Processes

et al. 2004

View full text Add to dashboard Cite

Abstract:Increasing attention is being paid to health and environmental risk as a result of the presence of trace steroid estrogens in the effluent discharged from municipal sewage treatment plants. This paper focuses on assessment of removal of these trace compounds using 3 H-labelled estrone as the model compound. Jar tests over a range of ferric chloride dosage and pH conditions showed that coagulation was ineffective in removal of estrone from secondary effluent. The experiments showed that the combination of PAC and microfiltration could be effective for removal of trace estrone from water. The rate and extent of estrone removal by PAC are functions of PAC dosage and retention time of PAC in the system. Mathematical analysis of the results using a homogeneous surface diffusion model (HSMD) indicates that the adsorption of estrone on PAC can be limited by film diffusion and internal surface diffusion. The surface and film mass transfer coefficients were determined to be 9.72 x 10 -10 cm 2 /min and 1.963 cm/min, respectively, under the conditions used.

show abstract

Adsorption of copper on glass beads coated with chitosan: Stirred batch and fixed bed analysis

et al. 2017

View full text Add to dashboard Cite

Chitosan is a natural polymer largely studied for heavy metal adsorption applications, since the amino and hydroxyl groups present in its structure can act as chelation sites. However, this material presents some drawbacks as an adsorbent due to its low mechanical strength. Studies have shown that the use of immobilized chitosan on glass beads can improve the mechanical strength of adsorbent and enhance mass transfer properties. For this reason, stirred batch experiments of copper adsorption on chitosan immobilized onto glass beads were performed to estimate the surface diffusion coefficient and the chitosan film thickness, considering an inert solid glass core. The kinetic data were modelled by a surface diffusion model incorporating the external film mass transfer resistance. Column experiments were also performed for copper solution at different flow rates and a film‐surface diffusion model was used to describe the breakthrough adsorption experiments, using the chitosan film thickness estimated from the batch experiment (φ = 2.5 µm). The input parameters for this model were determined by batch experiments or estimated from correlations available in the open literature. The surface diffusion coefficients (0.98–1.72 × 10−10 cm2 · min−1) of copper in the chitosan film for different flow rates were estimated. The experimental data and the model agreed, indicating that the film thickness and the mass transfer parameters were well predicted.

show abstract

Evaluation of surface and film diffusion coefficients for carbon adsorption

Cited by 66 publications

References 6 publications

Development and evaluation of Mn oxide-coated composite adsorbent for the removal and recovery of heavy metals from coal processing wastewater. Final report, December 1995

Development and evaluation of Mn oxide-coated composite adsorbent for the removal and recovery of heavy metals from coal processing wastewater. Final report, December 1995

Assessment of Trace Estrogenic Contaminants Removal by Coagulant Addition, Powdered Activated Carbon Adsorption and Powdered Activated Carbon/Microfiltration Processes

Adsorption of copper on glass beads coated with chitosan: Stirred batch and fixed bed analysis

Contact Info

Product

Resources

About