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Polyelectrolytes ability in reducing atrazine concentration in water: surface effects.

Mohd Amin MF, Heijman SG, Lopes SI, Rietveld LC - ScientificWorldJournal (2014)

Bottom Line: This paper reports on the direct ability of two positively charged organic polyelectrolytes (natural-based and synthetic) to reduce the atrazine concentration in water.The addition of polymers exhibited a capability in reducing the atrazine concentration up to a maximum of 60% in surface-to-volume ratio experiments.However, in this study, the conventional type of isotherm was not observed.

View Article: PubMed Central - PubMed

Affiliation: Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands ; Faculty of Earth Science, Universiti Malaysia Kelantan,, UMK Kampus Jeli, 17600 Jeli, Kelantan, Malaysia.

ABSTRACT
This paper reports on the direct ability of two positively charged organic polyelectrolytes (natural-based and synthetic) to reduce the atrazine concentration in water. The adsorption study was set up using multiple glass vessels with different polymer dosing levels followed by ultrafiltration with a 1 kDa membrane. The addition of polymers exhibited a capability in reducing the atrazine concentration up to a maximum of 60% in surface-to-volume ratio experiments. In the beginning, the theoretical L-type of the isotherm of Giles' classification was expected with an increase in the dosage of the polymer. However, in this study, the conventional type of isotherm was not observed. It was found that the adsorption of the cationic polymer on the negatively charged glass surface was necessary and influential for the removal of atrazine. Surface-to-volume ratio adsorption experiments were performed to elucidate the mechanisms and the polymer configuration. The glass surface area was determined to be a limiting parameter in the adsorption mechanism.

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Related in: MedlinePlus

Equilibrium adsorption of atrazine on Nalco 71305 and Nalco starch with different intitial concentrations.
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Related In: Results  -  Collection


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fig2: Equilibrium adsorption of atrazine on Nalco 71305 and Nalco starch with different intitial concentrations.

Mentions: The achieved reduction percentage of Nalco 71305 was in the range of 11 to 15% for the high atrazine concentrations (23 μg/L) and 17 to 37% for the low atrazine concentration (3 μg/L) (Figure 1). The Nalco starch achieved slightly higher reduction ranges of 24 to 36% and 24 to 47% for the high and low atrazine concentrations, respectively (Figure 1). The results also show that the reduction percentage saturates above dosages of 100 ppm for both polymers. There was no clear dose response effect of the different concentrations of polymers (adsorbent) on the removal of atrazine (solute). From the dosed concentration and the removed atrazine, an equilibrium loading Ce (atrazine amount left) was calculated and an adsorption capacity qe (being the adsorbed amount of the solute per unit weight of adsorbent in μg/g) was determined. The resulting isotherms are shown in Figure 2.


Polyelectrolytes ability in reducing atrazine concentration in water: surface effects.

Mohd Amin MF, Heijman SG, Lopes SI, Rietveld LC - ScientificWorldJournal (2014)

Equilibrium adsorption of atrazine on Nalco 71305 and Nalco starch with different intitial concentrations.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4150508&req=5

fig2: Equilibrium adsorption of atrazine on Nalco 71305 and Nalco starch with different intitial concentrations.
Mentions: The achieved reduction percentage of Nalco 71305 was in the range of 11 to 15% for the high atrazine concentrations (23 μg/L) and 17 to 37% for the low atrazine concentration (3 μg/L) (Figure 1). The Nalco starch achieved slightly higher reduction ranges of 24 to 36% and 24 to 47% for the high and low atrazine concentrations, respectively (Figure 1). The results also show that the reduction percentage saturates above dosages of 100 ppm for both polymers. There was no clear dose response effect of the different concentrations of polymers (adsorbent) on the removal of atrazine (solute). From the dosed concentration and the removed atrazine, an equilibrium loading Ce (atrazine amount left) was calculated and an adsorption capacity qe (being the adsorbed amount of the solute per unit weight of adsorbent in μg/g) was determined. The resulting isotherms are shown in Figure 2.

Bottom Line: This paper reports on the direct ability of two positively charged organic polyelectrolytes (natural-based and synthetic) to reduce the atrazine concentration in water.The addition of polymers exhibited a capability in reducing the atrazine concentration up to a maximum of 60% in surface-to-volume ratio experiments.However, in this study, the conventional type of isotherm was not observed.

View Article: PubMed Central - PubMed

Affiliation: Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands ; Faculty of Earth Science, Universiti Malaysia Kelantan,, UMK Kampus Jeli, 17600 Jeli, Kelantan, Malaysia.

ABSTRACT
This paper reports on the direct ability of two positively charged organic polyelectrolytes (natural-based and synthetic) to reduce the atrazine concentration in water. The adsorption study was set up using multiple glass vessels with different polymer dosing levels followed by ultrafiltration with a 1 kDa membrane. The addition of polymers exhibited a capability in reducing the atrazine concentration up to a maximum of 60% in surface-to-volume ratio experiments. In the beginning, the theoretical L-type of the isotherm of Giles' classification was expected with an increase in the dosage of the polymer. However, in this study, the conventional type of isotherm was not observed. It was found that the adsorption of the cationic polymer on the negatively charged glass surface was necessary and influential for the removal of atrazine. Surface-to-volume ratio adsorption experiments were performed to elucidate the mechanisms and the polymer configuration. The glass surface area was determined to be a limiting parameter in the adsorption mechanism.

Show MeSH
Related in: MedlinePlus