Mercury Recovery by Polymer-Enhanced Ultrafiltration: Comparison of Chitosan and Poly(Ethylenimine) Used as Macroligand

Kuncoro, Eko Prasetyo; Roussy, J.; Guibal, Eric

doi:10.1081/ss-200042646

Cited by 53 publications

(30 citation statements)

References 38 publications

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“…Alternatively, it is possible to use chitosan without cross-linking treatment but, at the saturation of the polymer, it is necessary to recover the metal-bound macromolecules by an ultrafiltration process. This is the base of polymer-enhanced ultrafiltration processes (PEUF) (Juang & Tseng 2000;Kuncoro et al 2004). The protonation of chitosan in acidic solution may be also interesting for the electrostatic attraction of anionic dyes (McKay et al 1987;Yoshida & Takemori 1997;Annadurai et al 2002;Gibbs et al 2003Gibbs et al , 2004Wong et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Chitosan Interactions with Metal Ions and Dyes: Dissolved-state vs. Solid-state Application

Guibal

Touraud

Roussy

2005

World J Microbiol Biotechnol

102

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Chitosan is an amino-polysaccharide with highly efficient properties for the binding of metal ions and anionic dyes. Uptake may occur through chelation on free amino functions (at near-neutral pH) or by electrostatic attraction on protonated amino groups (in acidic solutions). The polymer is soluble in acidic solutions and its binding properties can be used in both solid form (sorption) and liquid form (ultrafiltration coupled with chelation, coagulationflocculation). These properties have been used for the recovery of mercury from dilute solutions at initial pH 5 (which reveals the most efficient pH in the range pH 4-6) and for the recovery of Reactive Black 5 (RB5, anionic dye) at pH 3. While in the case of mercury binding saturation of the biopolymer is only slightly higher when chitosan is used in the liquid form compared to solid-state adsorption, in the case of the coagulation-flocculation of RB5 (using the liquid-form of chitosan) the saturation of the polymer (calculated on the basis of molar ratio of dye vs. amino groups of the polymer) is reached at a significantly greater value than when the polymer is used for the solid-state binding of the dye. There is a much more efficient use of amino groups when chitosan is used in the liquid-form due to a better availability of amino groups (less hydrogen bonds between the chains of the polymer) and to a better accessibility to internal sorption sites (lower diffusion control).

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Section: Introductionmentioning

confidence: 99%

Chitosan Interactions with Metal Ions and Dyes: Dissolved-state vs. Solid-state Application

Guibal

Touraud

Roussy

2005

World J Microbiol Biotechnol

102

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“…8 The protonation of amine groups also is responsible for the polymer dissolving in acidic solutions, with the notable exception of sulfuric acid solutions. Chitosan dissolved in acetic acid or hydrochloric acid can be used for the uptake of metal cations using polymer-enhanced ultrafiltration 14,15 These interactions of dissolved chitosan with solutes also may be used for the coagulation and flocculation of dissolved contaminants 16 and suspended colloids. 17 Several studies have focused on the use of chitosan for fish processing, 18 in the food industry, 19,20 and in river silt water, 21 latex particles, 22,23 microorganisms, 24,25 and suspensions containing mineral colloids.…”

Section: Introductionmentioning

confidence: 99%

Influence of chitosan characteristics on coagulation and flocculation of organic suspensions

Roussy

Vooren²,

Guibal

2005

J of Applied Polymer Sci

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Several samples of chitosan with different degrees of deacetylation and of different molecular weights were tested for the coagulation-flocculation of organic suspensions. Organic suspensions were prepared by mixing mushroom powder with tap water. Experiments were carried out at pH 5, pH 7, and pH 9. Because decreasing the pH reduced the amount of chitosan required to reach the required turbidity, at pH 9, a high concentration of chitosan was required to achieve the required treatment levels, whereas the difference was less significant between pH 7 and pH 5 (the required concentration of chitosan was halved). Though viscosity, correlated to the molecular weight of chitosan, affected treatment performance, its influence on the efficiency of coagulation-flocculation could be substantially reduced by slightly increasing the concentration of the polymer. This is of importance in the processing of industrial effluents: the aging of a chitosan solution, which may cause partial depolymerization, and loss of viscosity, will have a limited impact on process efficiency. The degree of deacetylation also has a limited effect on treatment performance, especially when the degree of deacetylation exceeds 90%.

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“…Sophisticated precipitants are required for reaching target levels [2]. Membrane processes such as polymer-enhanced ultrafiltration [3] or reverse osmosis can be applied, but the process is expensive for large-scale applications. Solvent extraction processes are generally used for the recovery of metal ions from highly concentrated solutions [4,5].…”

Section: Introductionmentioning

confidence: 99%

Mercury(II) Biosorption Using Lessonia sp. Kelp

Reategui

Maldonado

et al. 2010

Appl Biochem Biotechnol

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Lessonia nigrescens and Lessonia trabeculata kelps have been tested for the sorption of mercury from aqueous solutions. A pretreatment (using CaCl(2)) allowed stabilizing the biomass that was very efficient for removing Hg(II) at pH 6-7. Sorption isotherms were described by the Langmuir equation with sorption capacities close to 240-270 mg Hg g(-1) at pH 6. The temperature had a negligible effect on the distribution of the metal at equilibrium. The presence of chloride anions had a more marked limiting impact than sulfate and nitrate anions. The uptake kinetics were modeled using the pseudo-second-order equation that fitted better experimental data than the pseudo-first-order equation. The particle size hardly influenced sorption isotherms and uptake kinetics, indicating that sorption occurs in the whole mass of the biosorbent and that intraparticle mass transfer resistance was not the limiting rate. Varying the sorbent dosage and the initial metal concentration influenced the equilibrium, but the kinetic parameters were not drastically modified. Metal can be eluted with hydrochloric acid, citric acid, or acidic KI solutions.

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Mercury Recovery by Polymer-Enhanced Ultrafiltration: Comparison of Chitosan and Poly(Ethylenimine) Used as Macroligand

Cited by 53 publications

References 38 publications

Chitosan Interactions with Metal Ions and Dyes: Dissolved-state vs. Solid-state Application

Chitosan Interactions with Metal Ions and Dyes: Dissolved-state vs. Solid-state Application

Influence of chitosan characteristics on coagulation and flocculation of organic suspensions

Mercury(II) Biosorption Using Lessonia sp. Kelp

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