An equilibrium model for absorption of multiple divalent metals by alginate gel under acidic conditions

Jang, Larry K.; Nguyen, Duy V.; Geesey, Gill G.

doi:10.1016/s0043-1354(98)00373-x

Cited by 27 publications

(11 citation statements)

References 8 publications

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“…The level of the metal sorption to alginic acid extracted from Laminaria digitata was found to be in the order of Cu 2+ > Ba 2+ > Ca 2+ > Co 2+ (Haug, 1961). In another study, it was found that the sorption of Cu 2+ on alginate was much greater than the sorption of Zn 2+ (Jang et al, 1999). Higher extent of sorption of copper was also observed with formaldehyde cross linked Ascophyllum nodosum seaweed biomass (de Calvalho et al, 1995).…”

Section: Introductionmentioning

confidence: 95%

New method for evaluation of heavy metal binding to alginate beads using pH and conductivity data

Karagündüz

Unal

2006

Adsorption

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Extensive research has been conducted for removal and recovery of heavy metals from wastewater and industrial wastewater in recent years. Due to its low cost and high sorption efficiency, alginate was extensively investigated as a biosorbent. It is known that the sorption of metals to alginate is rate limited. However, the sampling in the beginning of experiments, from 30 seconds to few minutes, is very difficult, if not impossible. In this study, a nontraditional experimental method was used to determine the removal kinetics of metals for short time periods. A relationship among pH, conductivity, and metal concentration was established. It was shown that the sorption mechanism was ion exchange for all metals investigated in this study. A series of experiments was conducted to determine the ion exchange kinetics of different metals at varying pH conditions. Second order pseudo rate kinetics was shown to define the experimental findings well. Results also showed that the extent of exchange significantly reduced as the pH decreased. The selectivity of metal exchange to alginate beads was determined. It was observed that the extent of the ion exchange was greatest for Cu 2+ and lowest for Mn 2+ and Fe 2+ , following the order of Cu 2+ > Zn 2+ ∼ = Co 2+ ∼ = Ni 2+ > Mn 2+ ∼ = Fe 2+ .

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Section: Introductionmentioning

confidence: 95%

New method for evaluation of heavy metal binding to alginate beads using pH and conductivity data

Karagündüz

Unal

2006

Adsorption

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“…The sorption isotherms characterize both the sorbent and the sorbate and can be utilized, for instance, for preparation of material balances. In the literature, the results of sorption experiments on biosorbents are usually described by equations of Langmuir isotherms (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37). The maximum sorption capacity, q max , determined from those equations is considered as being one of principal criterions of suitability of a particular biosorbent for removal of metals by biosorption (38).…”

Section: Introductionmentioning

confidence: 99%

Removal of Cadmium(II) from Aqueous Solutions by Calcium Alginate Beads

Kwiatkowska-Marks

Wójcik

2014

Separation Science and Technology

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Sorption of Cd(II) ions from dilute aqueous solutions by alginate beads has been studied. The measurements were run at 25 • C at a fixed pH of 5.0. Equilibrium sorption isotherms have been determined over a wide cadmium concentration range of 0.3-3 mmol/dm 3 . The Langmuir equation has been found to adequately describe experimental results, and the equilibrium constants depended on the alginate content in the beads. The values of the maximum sorption capacity of Cd(II) ions have been found to decrease with increasing alginate content in the beads. Effective diffusivity (D e ) of the cadmium compounds was also calculated in the beads. The study was carried out using two methods: a shrinking core model (SCM) method and a newly developed method named conductometric. The conductometric method turned out to be a simple and effective one for calculation of effective diffusivity of Cd(II) in alginate sorbents. The D e values obtained by the two methods depended on the alginate content in the beads. However, the SCM method, in contrast to the conductometric one, gave the D e values increasing with increasing alginate level in the beads and higher than the molecular diffusivity of Cd(II), this being inconsistent with the mechanism of diffusion in porous carriers. For this reason, the conductometric method can be considered as one giving more reliable results than the SCM method. Moreover, the retardation coefficients of the diffusion in the alginate beads were calculated. Enhanced content of the biopolymer in the beads caused retardation of Cd(II) diffusion in the beads owing to decreasing of calculated retardation coefficients with increasing alginate contents in the beads.

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“…In recent years, much attention has been paid to the adsorption of metal ions on various kinds of microorganisms or biomass, such as algae and fungi, as well as on their cell components: alginic acid, chitin, cellulose, and so on [1][2][3]. Among these, chitin is a main component existing in the shells of crustaceans, such as crabs, shrimp, prawns, insects, and centipedes, and is easily prepared from their shells at low cost by removing other components, calcium and proteins, by treating with acids and alkalis, respectively.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and kinetics of trisodium 2-hydroxy-1,1′-azonaphthalene-3,4′,6-trisulfonate adsorption onto chitosan

Saha

Karmaker

Ichikawa

et al. 2005

Journal of Colloid and Interface Science

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An equilibrium model for absorption of multiple divalent metals by alginate gel under acidic conditions

Cited by 27 publications

References 8 publications

New method for evaluation of heavy metal binding to alginate beads using pH and conductivity data

New method for evaluation of heavy metal binding to alginate beads using pH and conductivity data

Removal of Cadmium(II) from Aqueous Solutions by Calcium Alginate Beads

Mechanisms and kinetics of trisodium 2-hydroxy-1,1′-azonaphthalene-3,4′,6-trisulfonate adsorption onto chitosan

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