Does pH affect adsorption of polyacrylamide?

The Sauter mean D [3,2] diameter of the hematite, magnetite and silica were measured to be 0.8, 1.9, and 2.0 µm respectively. An anionic polyacrylamide (PAM A, MW 520 kg/mol) exhibited strong variation in adsorbed amount with pH, while the adsorption of two neutral polyacrylamides (PAM N, MW 40 & 5500 kg/mol) had a weak dependence on pH.

How is adsorption of anionic polyacrylamide and chromium determined?

Adsorbed amounts of anionic polyacrylamide and chromium (VI) on the montmorillonite surface were determined by the static method based on the difference between the PAM or Cr (VI) concentrations in the solutions before and after the adsorption process. All experiments were performed at 25 °C.

Does anionic polyacrylamide affect adsorption of heavy metal ions?

At the lowest examined Cr (VI) ions concentration (i.e. 1 ppm), the anionic polyacrylamide presence does not affect the adsorption amount of heavy metal ions (Fig. 11 a). In this case all chromium (VI) ions undergo adsorption on the solid surface.

Does anionic polyacrylamide adsorb more strongly to iron oxide at low pH?

Anionic polyacrylamide adsorbed more strongly to iron oxide at low pH. Anionic polyacrylamide adsorption exceeded that of neutral polyacrylamide at low pH. Acrylamide-based polymers such as polyacrylamide (PAM) and their derivatives are widely used as additives to enhance solid-liquid separation in the mineral processing industry.

Does anionic polyacrylamide increase stability of dispersed solid particles?

Generally, the anionic polyacrylamide addition improves stability of the dispersed solid particles (at fixed pH and temperature, the decrease of TSI values for the system containing PAM in relation to that without polymer is observed). Table 2. Stability coefficient TSI for all examined systems, C PAM = 100 ppm

Is polyacrylamide adsorption on iron oxide selective?

Polyacrylamide adsorption on iron oxide is selective over silica as a function of pH. The adsorption of polyacrylamide on magnetite and hematite was compared. Anionic polyacrylamide adsorbed more strongly to iron oxide at low pH. Anionic polyacrylamide adsorption exceeded that of neutral polyacrylamide at low pH.