Adsorption of polyethyleneimine (PEI) on hematite. Influence of magnetic field on adsorption of PEI on hematite

Patkowski, J.; Myśliwiec, Dawid; Chibowski, S.

doi:10.1016/j.matchemphys.2014.01.019

Cited by 19 publications

(13 citation statements)

References 25 publications

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“…An important argument in favor of such a statement is the fact that polymeric molecules with high molecular mass, such as xyloglucan, would be more susceptible to a proposed adsorption mechanism. The other process that might play a significant role in the total adsorption rate is reconformation (sometimes called relaxation) of a polymer (in this case xyloglucan) in the adsorbed layer (Scheutjens and Fleer 1979;Shulga et al 2003;Patkowski et al 2014). When most of the available surface is coated with xyloglucan, a new free surface available for the 'bulk' polymer molecules to adsorb may be created only after macromolecules in the adsorbed layer have changed their structure to a more compact one.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…When most of the available surface is coated with xyloglucan, a new free surface available for the 'bulk' polymer molecules to adsorb may be created only after macromolecules in the adsorbed layer have changed their structure to a more compact one. This may happen by creating more loops (which decreases amount of trains) or by desorption and almost instant adsorption of the same molecule in a different structure, which requires less surface area on a cellulose fiber (Patkowski et al 2014). This hypothesis is strongly supported by the equilibrium adsorption data, which will be discussed further in this article.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

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Revision of adsorption models of xyloglucan on microcrystalline cellulose

et al. 2016

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Interactions among cellulose, hemicellulose and pectins are important for plant cell wall assembly and properties and also for industrial applications of these polysaccharides. Therefore, binding of pectin and xyloglucan on microcrystalline cellulose was investigated in this experiment by adsorption isotherms, zeta potential and scanning electron microscopy (SEM). Analysis of three isotherm models (Langmuir, Freundlich and Fowler-Guggenheim isotherms) showed that the experimental adsorption isotherm was well described via the Fowler-Guggenheim model, which includes lateral interaction between the adsorbate. The adsorption isotherm and zeta potential measurement showed that at temperature 25°C only xyloglucan adsorbed on the microcrystalline cellulose. In case of xyloglucan on cellulose, the equilibrium was reached in about 3-4 h, and the kinetics of adsorption were well described by the multiexponential equation. Analysis of the model suggests that two steps can be distinguished: diffusion and reconformation in an adsorbed layer. No adsorption of pectin was observed in this study. SEM study showed that xyloglucan may prevent cellulose from aggregation.

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Section: Adsorption Kineticsmentioning

confidence: 99%

Section: Adsorption Kineticsmentioning

confidence: 99%

Revision of adsorption models of xyloglucan on microcrystalline cellulose

et al. 2016

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“…A lot of studies have been carried out on the adsorption behavior of polymers between minerals such as starch and quartz, talc, hematite, chalcopyrite, manganese dioxide, and colloidal chromium(III) oxide . Various effects, such as those on the particle size, background ions, and temperature, were investigated in those studies .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of new hydrophobic polyacrylamide on the calcite surface

Wang

et al. 2017

J of Applied Polymer Sci

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A hydrophobic polyacrylamide (HPAM) was synthesized by aqueous free-radical chain polymerization to understand the adsorption action of the polymer on the calcite during operating stimulation. The polymer was designed as acrylamide (AM)/2-acrylamide-2-methylpropanesulfonic acid (AMPS)/2-methacryloyloxyethyl 12-alkyl dimethyl ammonium bromide (MADA). The structure of the polymer was characterized by Fourier transform infrared spectroscopy. The adsorption properties of the polyacrylamide onto pure calcite was investigated. When we compared the f potentials of the calcite particles in the presence and absence of HPAM, the adsorbed amount was affected by different factors, and the adsorption behaviors were examined to determine the adsorption layer. The results of the f potential measurements indicated that the particles were negatively charged between pHs of 6 and 12, and the presence of HPAM did not reverse that. Equilibrium adsorption studies showed that the adsorbed amount was affected by the concentration of HPAM, liquid-to-solid ratio, calcite particle size, concentration of background ions, and temperature, which were related the adsorption behaviors of HPAM. Hydrogen bonds between HPAM and calcite were important because the adsorbed amount was significantly reduced when the hydrogen bonds were broken by urea. It is necessary to develop a more active reagent that can break the hydrogen bonds and improve the effect of hydraulic fracturing.

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“…2 The effects of applied magnetic eld method on nonmagnetic colloidal particles in aqueous systems, relating to the physiochemical properties prior and aer magnetic eld exposure have been described by some researchers. [9][10][11] A number of research relating to the effect of magnetic eld on the adsorption processes have been reported. Khiadani, et al, 2013 observed an improved removal in the turbidity of Pb, Zn, Cd and PO 4 ions from urban runoff treated with a magnetic eld.…”

Section: Introductionmentioning

confidence: 99%