Application of the NICA–Donnan approach to calculate equilibrium between proton and metal ions with lignocellulosic materials

Li, Xiao-Sen; Englezos, Peter

doi:10.1016/j.jcis.2004.08.141

Cited by 14 publications

(10 citation statements)

References 14 publications

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“…The validitiy of Donnan model in context of pulp fibers is discussed in several papers [54][55][56]. The consensus is that Donnan model is satisfactory at moderate pH range (3-6) where precipitation of metal hydroxides do not occur and ion interactions with semi-permeable membrane, i.e., fibre cell wall, are non-specific [57][58][59]. We cannot rule out at this point the possibility that the nucleation within the S2 cell wall produces other than LDH particles also.…”

Section: +mentioning

confidence: 99%

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Lange

Lastusaari

Reza

et al. 2015

Fibers

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Inorganic Mg2+ and Al 3+ containing layered double hydroxide (LDH) particles were synthesised in situ from aqueous solution onto chemical pulp fibers of pine (Pinus sylvestris). High super saturated (hss) solution with sodium carbonate produced LDH particles with an average diameter of 100-200 nm. Nano-size (70 nm) LDH particles were found from fibers external surface and, to a lesser degree, from the S2 cell wall after synthesis via low super saturated (lss) route. The synthesis via slow urea hydrolysis (Uhyd) yielded micron and clay sized LDH (2-5 µm) and enabled efficient fiber densification via mineralization of S2 fiber wall layer as indicated by TEM and compliance analysis. The Uhyd method decreased fiber compliance up to 50%. Reduction in the polymerisation degree of cellulose was observed with capillary viscometry. Thermogravimetric analysis showed that the hybridization with LDH reduced the exothermic heat, indicating, that this material can be incorporated in flame retardant applications. Fiber charge was assessed by

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Section: +mentioning

confidence: 99%

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Lange

Lastusaari

Reza

et al. 2015

Fibers

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“…However, despite these encouraging results, knowledge of the geometric parameters that determine the electrostatic description of the system would be required in order to derive the intrinsic binding parameters (i.e., independent of the bulk ionic strength) [27].…”

Section: Equilibrium Studiesmentioning

confidence: 99%

Biosorption of cadmium by the protonated macroalga Sargassum muticum: Binding analysis with a nonideal, competitive, and thermodynamically consistent adsorption (NICCA) model

Lodeiro

Rey-Castro

Barriada

et al. 2005

Journal of Colloid and Interface Science

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Protonated biomass of the seaweed Sargassum muticum was investigated for its ability to remove cadmium(II) from aqueous solutions. In this work, a nonideal, semiempirical, thermodynamically consistent (NICCA) isotherm was proposed to fit the experimental ion binding data obtained in NaNO3 0.05 mol L(-1). This model describes the competition between protons and metal ions satisfactorily. Moreover, it reflects the complexity of the macromolecular systems that take part in biosorption considering the heterogeneity of the sorbent. It was demonstrated in this work that the NICCA isotherm constitutes a great improvement with respect to a simpler Langmuir competitive equation, which was not able to describe all the experimental data satisfactorily. Potentiometric acid-base titrations in the absence of cadmium were made to estimate the maximum amount of acid functional groups (2.61 mmol g(-1)) and the conditional proton binding parameters, logK (H) (3.8) and m(H) (0.54). The values of the binding parameters for the cadmium ion were chosen to provide the best simultaneous description of the isotherm at pH 4.5, as well as the dependence of cadmium adsorption on pH. Values of logK (Cd) (3.1), n(Cd) (1.8), and p (0.19) in the case of the NICCA isotherm or logK(Cd) (2.94-3.4) for Langmuir competitive models were obtained. Kinetic experiments were performed at two different pH values (3.0 and 4.5), establishing the time dependence that represents the sorption of cadmium with a pseudo-second-order kinetic model. It was observed that 4 h is enough to ensure that the equilibrium uptake was reached.

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“…It is difficult to explain this apparent selectivity. The interaction of metal ions with functional groups is governed primarily by Donnan equilibrium (non-specific binding interaction) and to a smaller extent by specific binding (Towers and Scallan, 1986;Li and Englezos, 2005). Experiments with single component solutions followed by binary and ternary would reveal the affinity of a particular pulp for an individual metal species as well as interactions.…”

Section: Resultsmentioning

confidence: 99%

“…The BSW pulp is chemically produced whereas the CTMP is produced by mechanical treatment aided by some chemical addition (sodium sulphite). Wood fibres suspended in waster are known to interact with metal ions through their negatively charged functional groups (Susilo et al, 2005;Li and Englezos, 2005). The most common groups are shown in Table 3.…”

Section: Introductionmentioning

confidence: 99%

Sequestering of heavy metal ions from aqueous solutions by using a lignocellulosic material

Chandraghatgi

Englezos

2008

IJEP

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The ability of Brown Stock Washer (BSW) unbleached kraft pulp and Chemi-Thermo-Mechanical Pulp (CTMP) to sequester heavy metals was studied. The BSW pulp is chemically produced while the CTM one is produced by mechanical treatment aided by some chemicals. The two pulps were rendered in their protonated form and then equilibrated with two aqueous solutions of metals. One was ocean water and the other was a laboratory prepared solution of metal ions. Both pulps were able to remove metal ions from the solution in a one-stage procedure. The overall metal removal efficiency of CTMP was in general greater than that of the BSW pulp for the low concentration metals.Reference to this paper should be made as follows: Chandraghatgi, R. and Englezos, P. (2008) 'Sequestering of heavy metal ions from aqueous solutions by using a lignocellulosic material', Int.

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Application of the NICA–Donnan approach to calculate equilibrium between proton and metal ions with lignocellulosic materials

Cited by 14 publications

References 14 publications

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Biosorption of cadmium by the protonated macroalga Sargassum muticum: Binding analysis with a nonideal, competitive, and thermodynamically consistent adsorption (NICCA) model

Sequestering of heavy metal ions from aqueous solutions by using a lignocellulosic material

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