Estimation of the adsorbent capacities from the adsorption isotherm of binary liquid mixtures on solids

Dada, Emmanuel A.; Wenzel, L. A.

doi:10.1021/ie00050a017

Cited by 3 publications

(3 citation statements)

References 12 publications

(24 reference statements)

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“…These models are generally based on the principles of statistical thermodynamic which are used for estimating certain parameters such as the surface excess, the parachor, etc. [13,141 which have to be included. Most of these models can be used only for well-defined binary or ternary mixtures.…”

Section: Data Analysis and Discussionmentioning

confidence: 99%

Removal of sulfur compounds from naphtha solutions using solid adsorbents

1997

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Two types of solid adsorbents, activated carbon and zeolite 13X, were used at 80°C to remove sulfur compounds from naphtha solutions. Adsorption isotherms have been determined in a pressure vessel. This investigation indicated that activated carbon is superior to zeolite 13X at such high temperatures. A new formula based on the Langmuir model has been found to fit the experimental data satisfactorily. Comparison of the findings of this study with those of a previous one conducted at ambient temperatures in this department indicates that such treatment generally gives better results at low temperature where almost complete recovery of the sulfur compounds can be performed by using zeolite 13X.

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Section: Data Analysis and Discussionmentioning

confidence: 99%

Removal of sulfur compounds from naphtha solutions using solid adsorbents

1997

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“…For example, for 1-naphthol at C, = 0.01 q, is 1.5 pmol/g, while at C, = 0.10 q, falls to 0.4 pmol/g. This phenomenon has been observed in other systems (Dada and Wenzel, 1991) and in one case was attributed to a decrease in the accessibility of the cellulose gel caused by the increase in the quantity of adsorbent per unit volume (Hedberg and Lindstorm, 1993).…”

Section: Adsorption Of Naphtholsmentioning

confidence: 55%

The use of mixing‐sensitive chemical reactions to study mixing in dispersed fibre systems: Adsorption of reactants and product dyes on the dispersed phase

Mmbaga

Bennington

1998

Can J Chem Eng

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Mixing-sensitive chemical reactions conducted under controlled conditions can be used to qualitatively and quantitatively assess mixing in aqueous systems. These reactions are typically competitive reactions where the distribution of products is used to quantify mixing. This technique is valuable for studying both mixing and local energy dissipation in dispersed systems where the opacity of the suspension prevents the use of other techniques. However, correct interpretation of the test results requires that adsorption of reactants and product dyes on the dispersed phase be known. The adsorption of the reactants and product dyes formed in the mixing-sensitive azo coupling between mixtures of I -and 2-naphthol and diazotized sulfanilic acid was measured in aqueous suspensions of nylon, polyethylene, fibreglass and kraft pulp fibres. The polyethylene fibre did not adsorb the reactants or product dyes. The nylon, fibreglass and kraft fibres adsorbed both reactants and product dyes, with adsorption described by Langmuir isotherms. Accounting for the adsorption of dye on the dispersed phase allowed correct interpretation of mixing in the aqueous phase of the dispersions. This technique is evaluated for mixing assessment in suspensions of nylon fibre and fully bleached kraft (FBK) pulp in a medium-intensity mixer.

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“…where Γ is the molecular coverage of a rutile nanoparticle by Alizarin Red S, Γ* is as defined earlier, wt is the loading of dyemodified rutile drop-casted onto a gold electrode (= 0.29 mg cm -2 ), NA is Avogadro's number (= 6.022 × 10 23 mol -1 ), and m' is a monolayer capacity 92 which is the ratio of the BET surface area (= 6.5 m 2 g -1 ) over the molecular cross sectional area of Alizarin Red S (= 1.2 × 10 -18 m 2 per molecule, estimated using Chem 3D software). By solving the above equation, the molecular coverage of 0.15 (± 0.02) monolayers of the dye is found to be present at the rutile surface.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Particle-impact analysis of the degree of cluster formation of rutile nanoparticles in aqueous solution

Shimizu

Sokolov

Young

et al. 2017

Phys. Chem. Chem. Phys.

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Cluster formation can profoundly influence the bioavailability and (bio)geochemical activity of nanoparticles in natural aquatic systems. While colloidal properties of nanoparticles are commonly investigated using light-scattering techniques, the requirement to dilute samples can affect the fundamental nature and extent of the cluster size. Hence, an alternative in situ approach that can cover a much higher and wider concentration range of particles is desirable. In this study, particle impact chronoamperometry is employed to probe the degree of cluster formation of Alizarin Red S modified rutile nanoparticles of diameter ca. 167 nm in conditions approximating those existing in the environment. Random collisions of individual clusters of the modified rutile particles with a stationary electrode result in transient current signals during a chronoamperometric measurement, indicative of the reduction of the adsorbed Alizarin Red S dye molecules. The results from the particle-impact analysis reveal that the nanoparticles are heavily clustered with an average 91 monomeric particles per cluster. As the spherical equivalent size of the clusters (ca. 754 nm in diameter) is considerably larger than that from nanoparticle tracking analysis (ca. 117 nm), the present work highlights the impact of the dilution on the fundamental nature of the colloidal suspension and introduces the electrochemical determination of the size distribution of inert mineral nanoparticles in highly concentrated media.

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Estimation of the adsorbent capacities from the adsorption isotherm of binary liquid mixtures on solids

Cited by 3 publications

References 12 publications

Removal of sulfur compounds from naphtha solutions using solid adsorbents

Removal of sulfur compounds from naphtha solutions using solid adsorbents

The use of mixing‐sensitive chemical reactions to study mixing in dispersed fibre systems: Adsorption of reactants and product dyes on the dispersed phase

Particle-impact analysis of the degree of cluster formation of rutile nanoparticles in aqueous solution

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