The effect of pH and ionic strength on the dispersion of carbon nanotubes in poly(acrylic acid) solutions

2011 ◽  
Vol 61 (4) ◽  
pp. 554-559 ◽  
Author(s):  
Yeong-Tarng Shieh ◽  
Jin-Yu Chen ◽  
Yawo-Kuo Twu ◽  
Wen-Jang Chen
Keyword(s):  
Carbon Nanotubes ◽  
Ionic Strength ◽  
Acrylic Acid ◽  
Acid Solutions ◽  
Effect Of Ph ◽  
Poly Acrylic Acid

Structure and swelling of poly(acrylic acid) hydrogels: effect of pH, ionic strength, and dilution on the crosslinked polymer structure

Polymer ◽  
2004 ◽  
Vol 45 (5) ◽  
pp. 1503-1510 ◽  
Author(s):  
Jeannine E. Elliott ◽  
Mara Macdonald ◽  
Jun Nie ◽  
Christopher N. Bowman
Keyword(s):  
Ionic Strength ◽  
Acrylic Acid ◽  
Polymer Structure ◽  
Effect Of Ph ◽  
Crosslinked Polymer ◽  
Poly Acrylic Acid

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.

Sign in / Sign up

Export Citation Format

Share Document