Comparison of adsorption affinity of anionic and cationic
For this reason at higher values of pH the electrostatic forces are more beneficial for the cationic polymer adsorption at pH 7 whereas in the case of anionic polyacrylamide the adsorbed amount increases at pH 5. Fig. 3. Adsorbed amounts of AN PAM 30% and CT PAM 35% on the montmorillonite surface at pH 5 and 7.
The anionic polyacrylamide PAM (with various contents of carboxyl groups) adsorption mechanism on the surface of SiO2-TiO2 (ST) mixed oxides in the pH range of 3–9 was examined.
Comparison of adsorption affinity of anionic
Polyacrylamide has greater adsorption affinity to the surface of silica-titania which contains 80% of TiO 2. • The PAM anionic carboxyl groups are preferentially bond to solid surface in comparison to the neutral amide ones. • The specific nanostructure of PAM adsorption layer influences the stability of mixed oxide aqueous suspension.
The anionic polymer exhibits the greatest adsorption on the surface of chromium(III) oxide whereas PAM affinity for the aluminium(III) oxide is the lowest.
The Determination of Traces of Polyacrylamides in Water
Małgorzata Wiśniewska, Stanisław Chibowski, Teresa Urban, Comparison of adsorption affinity of ionic polyacrylamide for the surfaces of selected metal oxides, Adsorption Science & Technology, 10.1177/0263617417702385, 35, 5-6, (582-591), (2017).
The influence of solution pH (in the range 3–9) on the adsorption of polyacrylic acid (PAA) on the mixed silica–alumina surface (SA-3: SiO2 97 %–Al2O3 3 % and SA-96: SiO2 4 %–Al2O3 96 %) was investigated. The following methods were applied in experiments: spectrophotometry, viscosimetry, potentiometric titration, and microelectrophoresis, which enable determination of adsorbed amount
Comparison of adsorption affinity of polyacrylic acid
The influence of solution pH (in the range 3–9) on the adsorption of polyacrylic acid (PAA) on the mixed silica–alumina surface (SA-3: SiO 2 97 %–Al 2 O 3 3 % and SA-96: SiO 2 4 %–Al 2 O 3 96 %) was investigated. The following methods were applied in experiments: spectrophotometry, viscosimetry, potentiometric titration, and microelectrophoresis, which enable determination of adsorbed
Of the two examined mixed oxides (SA-3 and SA-96), significantly greater affinity for the adsorption of anionic polyacrylic acid is exhibited by SA-96. It results from much more favorable electrostatic interactions occurring between the polymer chains and the SA-96 surface (attractive forces in the pH range 3–7.6).
Comparison of adsorption affinity of polyacrylic acid
The adsorbed amounts of polyacrylic acid are several (2 or 3) dozen times higher on the SA-96 surface than those observed on the SA-3 surface. A much greater adsorption affinity of PAA chains to the SA-96 surface is mainly due to the favorable attractive interactions which are present in the system at the pH range below pH pzc (namely at pH <7
The stability mechanism and thermal properties of the system alumina–anionic polyacrylamide (PAM) was studied. The polymer’s adsorption properties in dependence on the following parameters solution pH (in the range 3–9), temperature (in the range 15–35 °C), and carboxyl groups’ content in the PAM chains (in the range 5–30 %) were examined.
Adsorption of Polyacrylamide on Smectite, Illite,
In the polymer concentration range tested (0–1.2 g L −1), the anionic PAM 836A increased the dispersion of the clay suspensions but the cationic PAM 494C promoted the flocculation. The strong flocculation function of cationic PAM 494C made trapped clay particles inaccessible for adsorption despite its highest affinity for clay surfaces.
742 W. Zou, C. Yu, C. Sun, Y. Cao where q e-is polyacrylamide adsorption per unit weight at equilibrium (mg·g 1), C o is the initial polyacrylamide concentration in the solution (mg·dm-3), C e is the polyacrylamide concentration in the solution at equilibrium (mg·dm-3), V is the volume of the initial polyacrylamide solution used (dm3), and m is the mass of coal or
- What is polyacrylamide (PAM)?
- PAM, or anionic Polyacrylamide, is a very long chain, high molecular weight organic polymer produced from natural gas, with characteristics which make it useful as a soil amendment to control runoff and soil loss.
- What is a Common anionic Pam?
- Common anionic PAMs are usually produced by copolymerization of AMD and AA or one of its salts (see Fig. 1). Their molecular weights vary between 3.10 6 and 2.10 7 Da. The most polyvalent anionic PAM contains around 30 % of acrylate (mol). Synthesis pathway of anionic PAMs
- Is Apam-t a novel anionic polyacrylamide?
- APAM-T is a novel anionic polyacrylamide which has been successfully synthesized by ultrasonic initiated template copolymerization. Characterization results showed the evidence of the microblock structure’s existence and the enhancement of copolymerization degree by adding the template.
- How is anionic polyacrylamide synthesized?
- Synthesis mechanism The anionic polyacrylamide was synthesized by copolymerizing AM and SAS monomers. The essence of copolymerization is the free radical reaction. Thus, this chain reaction can be divided into three distinct processes: initiation, propagation, and termination.
