Determination of the complexation properties of a crosslinked poly(acrylic acid) gel with copper(II), nickel(II), and lead(II) in dilute aqueous solution

2001 ◽  
Vol 79 (4) ◽  
pp. 370-376 ◽  
Author(s):  
Catherine Morlay ◽  
Yolande Mouginot ◽  
Monique Cromer ◽  
Olivier Vittori
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Acrylic Acid ◽  
Metal Ion ◽  
Conditional Stability ◽  
Binding Properties ◽  
Complex Species ◽  
Complexing Capacity ◽  
Dilute Aqueous Solution ◽  
Poly Acrylic Acid

The possible removal of copper(II), nickel(II), or lead(II) by an insoluble crosslinked poly(acrylic acid) was investigated in dilute aqueous solution. The binding properties of the polymer were examined at pH = 6.0 or 4.0 with an ionic strength of the medium µ = 0.1 or 1.0 M (NaNO3) using differential pulse polarography as an investigation means. The highest complexing capacity of the polyacid was obtained with lead(II) at pH = 6.0 with µ = 0.1 M, 4.8 mmol Pb(II)/g polymer. The conditional stability constants of the complex species formed were determined using the method proposed by Ruzic assuming that only the 1:1 complex species was formed; for lead(II) at pH = 6.0 and µ = 0.1 M, log K' = 5.3 ± 0.2. It appeared that the binding properties of the polymer increased, depending on the metal ion, in the following order: Ni(II) < Cu(II) < Pb(II). The complexing capacity and log K' values decreased with the pH or with an increase of the ionic strength. These results were in agreement with the conclusions of our previous studies of the hydrosoluble linear analogues. Finally, with the insoluble polymer, the log K' values were comparable to those previously obtained with the linear analogue whereas the complexing capacity values expressed in mmol g-1 were slightly lower.Key words: insoluble crosslinked poly(acrylic acid), copper(II), nickel(II), and lead(II) complexation.

The removal of Cu (II), Cd (II), Ni (II) and Pb (II) from dilute aqueous solution by a poly(acrylic acid) flocculant and its cross-linked analogue

2002 ◽  
Vol 2 (2) ◽  
pp. 27-34 ◽  
Author(s):  
C. Morlay ◽  
Y. Mouginot ◽  
M. Cromer ◽  
O. Vittori
Keyword(s):  
Aqueous Solution ◽  
Stability Constants ◽  
Metal Ion ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Conditional Stability ◽  
Complex Species ◽  
Complexing Capacity ◽  
Dilute Aqueous Solution ◽  
Acrylic Acids

The possible removal of copper (II), cadmium (II), nickel (II) and lead (II) from dilute aqueous solution by complexation with poly(acrylic acids) was investigated. The binding properties of two hydrosoluble poly(acrylic acids) of high molecular weight (which make them representative of synthetic flocculants used in the water treatment field; Mw = 2.5 × 105 and 3 × 106 g mol-1) and of an insoluble cross-linked analogue were examined. Potentiometric titrations were carried out, first, to determine the acid-base properties of both polymers and, secondly, to determine the stability constants of the MA and MA2 complex species formed. Metal complexation was also studied using differential pulse polarography. The complexing capacity of each polyacid for the metal ions under study was determined at pH 6.0, 5.0 and 4.0 and the ionic strength was 0.1 or 1.0 mol l-1. The conditional stability constants were estimated assuming that only 1:1 complex species were formed. The results obtained by both methods agree and are complementary. It appeared that stability constants increased in the following order, depending on the metal ion : Ni (II) &lt;&lt; Cd (II) &lt; Cu (II) &lt; Pb (II). The hydrosoluble polyacid was able to fix up to 6.3 mmol Pb (II)/g while the insoluble cross-linked analogue was able to fix up to 4.8 mmol Pb (II)/g.

Potentiometric study of cadmium(II) and lead(II) complexation by a cross-linked poly(acrylic acid). Comparison with the linear analogue

2000 ◽  
Vol 78 (12) ◽  
pp. 1637-1641 ◽  
Author(s):  
Catherine Morlay ◽  
Yolande Mouginot ◽  
Monique Cromer ◽  
Michelle Chatelut ◽  
Olivier Vittori
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Complex Species ◽  
Potentiometric Study ◽  
Predominant Species ◽  
Dilute Aqueous Solution ◽  
Complexing Properties ◽  
The Stability ◽  
Acid Comparison ◽  
Poly Acrylic Acid

Cadmium(II) or lead(II) complex formation with an insoluble cross-linked poly(acrylic acid) was investigated in dilute aqueous solution (NaNO3 0.1 M, 25°C). Potentiometric titrations were carried out to determine the stability constants of the MA and MA2 complex species formed. The Bjerrum's method, modified by Gregor et al. (1955), for the study of polymeric acids was used. The results obtained showed that lead(II) was more readily bound to the polymer. PbA2 was the predominant species; the global stability constant log B102 was equal to 7.4. With cadmium(II), none of the complex species MA or MA2 was predominant (log B102 = 6.0). Finally, the comparison of these results with those of our previous studies showed that the insoluble cross-linked poly(acrylic acid) and its hydrosoluble linear analogues present similar complexing properties towards cadmium(II), lead(II), copper(II), and nickel(II).Key words: insoluble cross-linked poly(acrylic acid), cadmium(II), lead(II), complexation, potentiometry.

The Structure and Aggregation of Hydrogen-Bonded Interpolymer Complexes of Poly(acrylic acid) With Poly(N-vinylpyrrolidone) in Dilute Aqueous Solution

2011 ◽  
Vol 212 (23) ◽  
pp. 2529-2540 ◽  
Author(s):  
Artur Henke ◽  
Sławomir Kadłubowski ◽  
Marian Wolszczak ◽  
Piotr Ulański ◽  
Volodymyr Boyko ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Interpolymer Complexes ◽  
Dilute Aqueous Solution ◽  
Poly Acrylic Acid ◽  
Hydrogen Bonded

Phase behavior of temperature‐ and pH‐sensitive poly(acrylic acid‐g‐N‐isopropylacrylamide) in dilute aqueous solution

2008 ◽  
Vol 109 (6) ◽  
pp. 4036-4042 ◽  
Author(s):  
Shouxin Liu ◽  
Xia Liu ◽  
Fang Li ◽  
Yu Fang ◽  
Yijuan Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Phase Behavior ◽  
Ph Sensitive ◽  
Dilute Aqueous Solution ◽  
Poly Acrylic Acid

scholarly journals Thermo-Responsive Behavior of Mixed Aqueous Solution of Hydrophilic Polymer with Pendant Phosphorylcholine Group and Poly(Acrylic Acid)

Polymers ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 148
Author(s):  
Hirokazu Fukumoto ◽  
Kazuhiko Ishihara ◽  
Shin-Ichi Yusa
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Solution Temperature ◽  
Interpolymer Complex ◽  
Mixed Aqueous Solution ◽  
Upper Critical Solution Temperature ◽  
Acidic Conditions ◽  
Decreasing Ph ◽  
Increasing Temperature ◽  
Poly Acrylic Acid

A mixed aqueous solution of hydrophilic poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) and poly(acrylic acid) (PAAc) becomes cloudy under acidic conditions at room temperature. The pendant carboxylic acid groups in PAAc form hydrogen bonds with the ester and phosphate groups in PMPC. While the polymers aggregate under acidic conditions, neither one associate under basic conditions because of the deprotonation of the pendant carboxy groups in PAAc. We observed that the interpolymer complex formed from PMPC, and PAAc was dissociated in aqueous solutions with increasing temperature, which is an upper critical solution temperature behavior. With increasing temperature, the molecular motion increased to dissociate the interpolymer complex. The phase transition temperature increased with increasing polymer and salt concentrations, and with decreasing pH.

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