Pore- and Solid-Diffusion Kinetics in Fixed-Bed Adsorption under Constant-Pattern Conditions

Hall, K. R.; Eagleton, L. C.; Acrivos, Andreas; Vermeulen, Theodore

doi:10.1021/i160018a011

Cited by 2,626 publications

(1,244 citation statements)

References 9 publications

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“…The affinity between MB and the diatomite-templated carbons are evaluated based on the separation factor, R L , determined from the Langmuir adsorption isotherm model [47,48]. R L is defined by the following equation:…”

Section: Mb Adsorption and Regeneration Of The Diatomite-templated Pomentioning

confidence: 99%

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Liu¹,

Yuan²,

Tan³

et al. 2012

Journal of Colloid and Interface Science

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Section: Mb Adsorption and Regeneration Of The Diatomite-templated Pomentioning

confidence: 99%

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Liu¹,

Yuan²,

Tan³

et al. 2012

Journal of Colloid and Interface Science

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“…dimensionless constant called separation factor or equilibrium parameter (R L ), which is defined by the following relationship (Hall et al, 1966;Malik, 2004):…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of hexavalent chromium from aqueous solutions by wheat bran

Nameni

Moghadam

Arami

2008

Int. J. Environ. Sci. Technol.

181

117

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ABSTRACT:In this research, adsorption of chromium (VI) ions on wheat bran has been studied through using batch adsorption techniques. The main objectives of this study are to 1) investigate the chromium adsorption from aqueous solution by wheat bran, 2) study the influence of contact time, pH, adsorbent dose and initial chromium concentration on adsorption process performance and 3) determine appropriate adsorption isotherm and kinetics parameters of chromium (VI) adsorption on wheat bran. The results of this study showed that adsorption of chromium by wheat bran reached to equilibrium after 60 min and after that a little change of chromium removal efficiency was observed. Higher chromium adsorption was observed at lower pHs, and maximum chromium removal (87.8 %) obtained at pH of 2. The adsorption of chromium by wheat bran decreased at the higher initial chromium concentration and lower adsorbent doses. The obtained results showed that the adsorption of chromium (VI) by wheat bran follows Langmuir isotherm equation with a correlation coefficient equal to 0.997. In addition, the kinetics of the adsorption process follows the pseudo second-order kinetics model with a rate constant value of 0.131 g/mg.min The results indicate that wheat bran can be employed as a low cost alternative to commercial adsorbents in the removal of chromium (VI) from water and wastewater.

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“…The calculated Langmuir separation factors ( R @ ) at different initial Co (II) and Ni (II) concentrations as shown in Fig. 13 and 14 respectively were in the range of 0 to1 in the experimental isotherm, which confirms the favourable uptake of the two metal ions and lower R @ values at higher initial metal ion concentrations showed that the adsorption processes were more favourable at higher concentrations [32]. A similar report was made by Yao et al [33] on the adsorption of Cu (II) onto the chestnut shell.…”

Section: Adsorption Isotherms Freundlichmentioning

confidence: 63%

Sequestering of Ni (II) and Co (II) from Aqueous Solution Using Spines of <i>Bombax buonopozense</i> as Low-Cost Adsorbent

Mustapha¹

2017

AJCHE

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Abstract:The release of potentially toxic elements either by anthropogenic or industrial activities has deteriorated water quality rendering water bodies unsuitable. It was on this basis that readily available agricultural waste was used to treat simulated wastewater containing the potentially toxic element (Ni and Co). Adsorption studies of Co and Ni from aqueous solution were performed using spines of Bombax buonopozense (raw), carbon prepared from Bombax buonopozense (AC 1 ) and activated carbon prepared from modification of spines of cotton silk tree (AC 2 ). Batch adsorption techniques were carried out as a function of contact time, pH, initial concentration, temperature, and dosage. The respective optimum contact times required for adsorption Co and Ni were 90 min. Characterizations of adsorbents were carried out which include: bulk density, hardness, electrical conductivity, ash contents, percentage moisture, and yield. Fourier transform infra-red spectroscopy (FTIR) showed that functional groups in the sorbents were responsible for the adsorption process. The adsorption isotherms data were tested for Langmuir, Temkin and Freundlich equations. The pseudo-first-order, pseudo-second-order, Elovich and diffusion (intra-particle) models were investigated on the adsorption kinetic data. This could be as a result of ion exchange involved in the sequestration of metal ions by the adsorbents. Therefore, sorption using spines of Bombax buonopozense has been adjudged as one of the best tools for replacing conventional methods for the removal of these metals because of its efficiency, costeffectiveness and the availability of the adsorbents.

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Pore- and Solid-Diffusion Kinetics in Fixed-Bed Adsorption under Constant-Pattern Conditions

Cited by 2,626 publications

References 9 publications

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Adsorption of hexavalent chromium from aqueous solutions by wheat bran

Sequestering of Ni (II) and Co (II) from Aqueous Solution Using Spines of <i>Bombax buonopozense</i> as Low-Cost Adsorbent

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Pore- and Solid-Diffusion Kinetics in Fixed-Bed Adsorption under Constant-Pattern Conditions

Cited by 2,626 publications

References 9 publications

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Adsorption of hexavalent chromium from aqueous solutions by wheat bran

Sequestering of Ni (II) and Co (II) from Aqueous Solution Using Spines of &lt;i&gt;Bombax buonopozense&lt;/i&gt; as Low-Cost Adsorbent

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Product

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About

Sequestering of Ni (II) and Co (II) from Aqueous Solution Using Spines of <i>Bombax buonopozense</i> as Low-Cost Adsorbent