Fundamental studies of foam fractionation of cadmium: Effect of the addition of monovalent ions on surface excess of cadmium

Kubota, Kaoru; Hayashi, Shinya; Takubo, Y.

doi:10.1002/cjce.5450570507

Cited by 13 publications

(3 citation statements)

References 4 publications

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“…In previous studies about foam separation (8)(9)(10)(11)(12)(13)(14), the adsorption density, of the present system to the adsorption of proteins on bubble surface will be discussed. Figure 1 shows the mass balance of continuous foam separation.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Water-Soluble Proteins onto Bubbles in Continuous Foam Separation

Maruyama¹,

Suzuki²,

Seki³

2000

Journal of Colloid and Interface Science

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The enriching mechanism of water-soluble proteins in continuous foam separation was studied. The liquid flow rate and the protein concentration in foam phase were measured at various heights from the interphase between bulk liquid and foam layer, and the intrinsic values at the interface were estimated by the extrapolation method to determine the accurate adsorption density on bubble surface. Ovalbumin (OA) and hemoglobin (HB) were used as the soluble proteins. The solution pHs were varied from 3.5, 4.6 and 6.0 for OA and from 6.0, 6.8 and 8.0 for HB. The experimental isotherms for OA and HB were compared to the Langmuir isotherm, and the two adsorption parameters of the equilibrium constant, K, and the saturated density, γ, at each pH were determined. Both γ values obtained for OA and HB showed maxima at their isoelectric point (i.e.p., pH 4.6 for OA and pH 6.8 for HB). Assuming that OA and HB molecules are spherical in shape and they are adsorbed on bubble surface in a closed packed structure at the saturated condition, the calculated diameters for OA and HB molecules were quite similar to the literature values. The variation in γ for both OA and HB were discussed qualitatively relating to the net charge of protein molecule.2

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Section: Introductionmentioning

confidence: 99%

Adsorption of Water-Soluble Proteins onto Bubbles in Continuous Foam Separation

Maruyama¹,

Suzuki²,

Seki³

2000

Journal of Colloid and Interface Science

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“…6, where NDS À and NDS 2 Cd stand for the adsorbed dodecyl sulphate ions and for the bound complex of dodecyl sulphate and Cd at the airwater interface, respectively. Since Cd 2þ ions exhibit higher apparent surface activity than Na þ ions, the co-adsorption of Na þ with DS À at the air-water interface can be neglected (4,22):…”

Section: Effect Of Feed CD Concentrationmentioning

confidence: 99%

Removal of Trace Cd²⁺Using Continuous Multistage Ion Foam Fractionation: Part II—The Effects of Operational Parameters

Rujirawanich¹,

Chavadej²,

O’Haver³

et al. 2011

Separation Science and Technology

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A multistage ion foam fractionation column with bubble-cap trays was employed to study the removal of cadmium ions from simulated wastewater having low Cd concentrations (10-30 mg/L), examining the effects of foam height, air flow rate, feed flow rate, and feed Cd concentration. Sodium dodecyl sulfate (SDS) was used to generate foam in this study. An increase in foam height, which reduces liquid hold-up in the generated foam, resulted in the enhancement of the enrichment ratios of both SDS and Cd while the removal and residual factor of Cd showed insignificant change. An increase in air flow rate increased the foam generation rate, foamate volumetric ratio, and the removal efficiency of Cd but decreased the enrichment ratios of both Cd and SDS. The separation factors of both Cd and SDS decreased with increasing feed flow rate, which is mainly attributable to both the effects of the enhancement of foamate volumetric ratio and the increases in both SDS and Cd input rates. An increase in feed Cd concentration was found to increase Cd effluent concentration and SDS removal but to decrease the enrichment ratios of both Cd and SDS because of the increasing liquid entrainment in the produced foam.

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“…In the adsorptive bubble separation techniques, the adsorption density on the bubble surface (surface excess) has been often determined from the mass balance of the separation column (6)(7)(8)(9). On the other hand, the volumetric flow rate and the concentration of the droplets and the collapsed foam liquid had an axial distribution with the column height (5,(10)(11)(12).…”

Section: Introductionmentioning

confidence: 99%

Influence of Liquid Properties and Operating Variables on Enrichment Ratio in Nonfoaming and Foaming Adsorptive Bubble Separation Techniques

Suzuki

Maruyama

2001

Journal of Colloid and Interface Science

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The influence of the liquid properties and the operating variables on the intrinsic volumetric flow rate, q 0 , of the droplets at the liquid−atmosphere interface in nonfoaming adsorptive bubble separation and that, W f0 , of the liquid in foam at the liquid−foam interface in foam separation was studied to estimate the enrichment ratio of surface−active substance in the both techniques. Each intrinsic flow rate was determined by the extrapolation method, which the authors proposed previously, and was mainly influenced by superficial gas velocity, liquid viscosity and surface tension. Despite of small change in the surface tension and the liquid viscosity, they greatly affected to the intrinsic flow rate for both the droplets and the liquid in foam. The experimental results were applied to a dimensional analysis. A good agreement of the experimental enrichment ratio and the calculated ones was obtained by using the correlations for nonfoaming and foaming.2

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Fundamental studies of foam fractionation of cadmium: Effect of the addition of monovalent ions on surface excess of cadmium

Cited by 13 publications

References 4 publications

Adsorption of Water-Soluble Proteins onto Bubbles in Continuous Foam Separation

Adsorption of Water-Soluble Proteins onto Bubbles in Continuous Foam Separation

Removal of Trace Cd²⁺Using Continuous Multistage Ion Foam Fractionation: Part II—The Effects of Operational Parameters

Influence of Liquid Properties and Operating Variables on Enrichment Ratio in Nonfoaming and Foaming Adsorptive Bubble Separation Techniques

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Fundamental studies of foam fractionation of cadmium: Effect of the addition of monovalent ions on surface excess of cadmium

Cited by 13 publications

References 4 publications

Adsorption of Water-Soluble Proteins onto Bubbles in Continuous Foam Separation

Adsorption of Water-Soluble Proteins onto Bubbles in Continuous Foam Separation

Removal of Trace Cd2+Using Continuous Multistage Ion Foam Fractionation: Part II—The Effects of Operational Parameters

Influence of Liquid Properties and Operating Variables on Enrichment Ratio in Nonfoaming and Foaming Adsorptive Bubble Separation Techniques

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Removal of Trace Cd²⁺Using Continuous Multistage Ion Foam Fractionation: Part II—The Effects of Operational Parameters