Theoretical and Experimental Study of Pb2+ and Hg2+ Adsorption on Biopolymers, 2. Experimental Part

Debbaudt, Adriana; Zalba, M.S; Ferreira, Marı́a Luján; Gschaider, M. E.

doi:10.1002/1616-5195(20010801)1:6<249::aid-mabi249>3.0.co;2-g

Cited by 17 publications

(11 citation statements)

References 10 publications

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“…The coordination of water also affects the adsorption and kinetic and diffusional considerations in the case of Hg make the adsorption slow. The reaction above would also occur with [Hg(H 2 O) 5 OH] + [31,32].…”

Section: Initial Considerationsmentioning

confidence: 44%

Kinetics and equilibrium parameters of Hg(II) adsorption on silica–dithizone

Cestari

Vieira

Lopes

et al. 2004

Journal of Colloid and Interface Science

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Section: Initial Considerationsmentioning

confidence: 44%

Kinetics and equilibrium parameters of Hg(II) adsorption on silica–dithizone

Cestari

Vieira

Lopes

et al. 2004

Journal of Colloid and Interface Science

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“…11,12) Debbaudt et al reported that the pectin of Sugar beet is chelated with Hg(II). 13) In this study, a similar adsorption mechanism was used.…”

Section: Resultsmentioning

confidence: 44%

Adsorption of Cadmium Ions by Wheat Bran Treated with Pectinase

Ogata

Tominaga

Kangawa

et al. 2011

CHEMICAL & PHARMACEUTICAL BULLETIN

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In this study, we investigated the surface properties of raw wheat bran (R-WB) and wheat bran treated with Pectinase PL (P-WB) to evaluating its efficacy for removal of cadmium from waste water. The concentration of cadmium ions adsorbed by them was evaluated. The concentration of carboxyl groups of R-WB (3.56 mmol/g) was greater than that of P-WB (2.11 mmol/g), which indicated that the pectin of R-WB was broken down, resulting in a decrease in the concentration of carboxyl groups due to the enzyme treatment. From the scanning electron microscope (SEM) images of P-WB, the pores were newly generated with enzyme treatment. The concentration of cadmium ions adsorbed onto R-WB was greater than that of cadmium ions adsorbed onto P-WB. These results show that the adsorption mechanism of cadmium ions onto R-WB and P-WB depends on the carboxyl groups of pectin.

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“…10 In one study of chitosan and its glutaraldehyde cross-linked derivative it was concluded that the metal ion uptake mechanism was absorption within the polymers rather than adsorption on the polymer surface. 12,13 We address the following problem: to model the temporal and spatial development of competitive absorption of metal ions within a polymer matrix. Furthermore, the effect of conformational changes within polymers could also play an important role in the metal uptake mechanism.…”

Section: Introductionmentioning

confidence: 99%

Mathematically modelling competitive ion absorption in a polymer matrix

et al. 2014

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A recent publication [Lindén et al., RSC Adv., 2014, 4, 25063-25066] describing a material with extreme efficiency and selectivity for adsorbing copper opens up the possibility of large scale purification technologies and new materials for prevention of biological growth, both in bulk and on surfaces. On the molecular scale, the material's efficiency and selectivity depends on competitive metal ion diffusion into a nanometer thin polymer film and on competitive binding of metal ions to specific ligand sites. We present and explore two reaction-diffusion models describing the detailed transport and competitive absorption of metal ions in the polymer matrix studied in [Lindén et al., RSC Adv., 2014, 4, 25063-25066]. The diffusive transport of the ions into an interactive, porous polymer layer of finite thickness, supported by an impermeable substrate and in contact with an infinite electrolyte reservoir, is governed by forced diffusion equations, while metal ion binding is modelled by a set of coupled reaction equations. The qualitative behavior observed in experiments can be reproduced and explained in terms of a combination of (a) differing ion diffusive rates and, effectively, (b) an ion exchange process that is superimposed on independent binding processes. The latter's origin is due to conformational changes taking place in the polymer structure in response to the binding of one of the species. The results of simulations under a diverse set of parameter conditions are discussed in relation to experimental observations.

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Theoretical and Experimental Study of Pb2+ and Hg2+ Adsorption on Biopolymers, 2. Experimental Part

Cited by 17 publications

References 10 publications

Kinetics and equilibrium parameters of Hg(II) adsorption on silica–dithizone

Kinetics and equilibrium parameters of Hg(II) adsorption on silica–dithizone

Adsorption of Cadmium Ions by Wheat Bran Treated with Pectinase

Mathematically modelling competitive ion absorption in a polymer matrix

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