Adsorption et desorption de l'eau vapeur sur un polymere polyacrylique superabsorbant IV. Effect de la masse sur les cinétiques d'adsorption et de désorption

Bakass, M.; Mokhlisse, A.; Lallemant, M.

doi:10.1016/0040-6031(95)02785-8

Cited by 8 publications

(8 citation statements)

References 7 publications

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“…These forces of attraction depend not only on the load of the ion but also on its ray and its polarizing capacity. Given that the values of the rays of K ϩ , NH 4 ϩ , and Na ϩ are rather close: The test with divalent ions showed that in addition to the shielding effect, it can have a formation of complexes 14 which prevents the expansion of freezing; thus, the maximum rate of absorption decreases when the concentration of the divalent ions increases (Fig. 8).…”

Section: Discussionmentioning

confidence: 97%

“…The Na ϩ ions come to fit between the polymeric chains and hidingplace between the loads carried by the macromolecule what minimizes the electrostatic repulsion 11 thus involving a reduction in the maximum rate of absorption. 12,13 The presence of the mono-valent ions K ϩ and NH 4 ϩ induces (by effect shielding) a reduction in the capacity for absorption of polymer, as in the case of NaCl; only differs the of electrostatic forces ensuring the interaction ions-site charged. These forces of attraction depend not only on the load of the ion but also on its ray and its polarizing capacity.…”

Section: Discussionmentioning

confidence: 97%

“…We present on Figures 8 and 9 the curves representing the evolution of the transmission of light and the variation of the surface tension with the rate of absorption for various concentrations of NH 4 ϩ , K …”

Section: Effect Of the Presence Of Ionsmentioning

confidence: 99%

“…• Content of ions mono and/or divalent, which affects the degree of reticulation, while adding to this solution a given quantity of ionizable salt, for example, NaCl, KCl, NH 4 Cl. The positive loads coming from salt hidingplace between the negative charges carried by the polymeric chains and thus decrease the intensity of the force repulsive existing between the same load signs.…”

Section: Introductionmentioning

confidence: 99%

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Absorption and desorption of liquid water by a superabsorbent polyelectrolyte: Role of polymer on the capacity for absorption of a ground

Bakass

Mokhlisse

Lallemant

2001

J of Applied Polymer Sci

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ABSTRACT:To study the potentialities of a polyelectrolyte superabsorbent for the storage of water, we have studied a ground representative of the area of Haouz (area of Marrakesh, South of Morocco) in the presence of polymer. We sought the optimal proportions allowing the best retention of water by the mixture made up of the polymer and the ground and to prolong the storage period of water in the ground. We have also studied the effect of certain ions and the pH on the capacity for absorption of polymer. These ions can be naturally present in the ground or introduced by the means of manure and pesticides. The presence of polymer in the ground makes it possible to increase the capacity for absorption of the water by the ground, which can thus involve a saving in water while decreasing the frequency of irrigation and by reducing the water losses by the phenomena of evaporation and infiltration.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Effect Of the Presence Of Ionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Absorption and desorption of liquid water by a superabsorbent polyelectrolyte: Role of polymer on the capacity for absorption of a ground

Bakass

Mokhlisse

Lallemant

2001

J of Applied Polymer Sci

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“…As shown combined carried out masses m 0 performed experimen The results obtained in this study can be compared with those obtained by Bakass et al (1997) for the adsorption and the desorption of water vapor on a superabsorbent polymer, Aouad et al (2006) during the drying of phosphates black and Aouad et al (2002) during the decomposition of natural phosphate and its kerogen.…”

Section: Experimentioning

confidence: 98%

Study of the Interaction Between Water and Gelidium sesquipedale (Rhodophyta): Part II: Kinetic of the Drying Process

Hnini¹,

Benchanâa²,

Hammioui³

2014

IJC

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The study of drying of red alga (Gelidium sesquipedale, Rhodophyta), with initial sample masses varying from 1 to 10 g, was carried at different temperatures 30 -80 °C. The experimental drying curves show a slight effect of the initial mass. Two types of curves are obtained: those at temperatures below 50 °C are fitted into straight line according to an interfacial progression process in cylindrical symmetry. Those of high-temperature drying (50 < θ < 80 °C), are perfectly parabolic and show that the kinetic regime is controlled by the three-dimensional diffusion according to the Jander equation. The two types of water molecules identified were also highlighted during the drying kinetics process. The apparent activation energy of the strongly bounded water (20%) is about 36.25 kJ·mol -1 , and that of the wetting water is in the range of 47.68 kJ·mol -1 .

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Absorption and desorption of liquid water by a superabsorbent polymer: Effect of polymer in the drying of the soil and the quality of certain plants

Bakass¹,

Mokhlisse²,

Lallemant³

2001

J of Applied Polymer Sci

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135

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ABSTRACT:In this work, we were interested in the study of the kinetic behavior of the reaction of drying soil representing the Marrakesh region (south of Morocco) in the presence of an superabsorbent polymer. The presence of a polymer in the soil diminished the kinetic drying of the soil, which will have as an application a reduction in water loss in the process of irrigation. The presence of a polymer in the soil enables a complete modification of the kinetic regimes controlling the soil-drying kinetic. We also realized the first study of the behavior of certain selected plants in the melange of a soil and a polymer.

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Adsorption et desorption de l'eau vapeur sur un polymere polyacrylique superabsorbant IV. Effect de la masse sur les cinétiques d'adsorption et de désorption

Cited by 8 publications

References 7 publications

Absorption and desorption of liquid water by a superabsorbent polyelectrolyte: Role of polymer on the capacity for absorption of a ground

Absorption and desorption of liquid water by a superabsorbent polyelectrolyte: Role of polymer on the capacity for absorption of a ground

Study of the Interaction Between Water and Gelidium sesquipedale (Rhodophyta): Part II: Kinetic of the Drying Process

Absorption and desorption of liquid water by a superabsorbent polymer: Effect of polymer in the drying of the soil and the quality of certain plants

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