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.

What is anionic polyacrylamide (Apam)?

Anionic Polyacrylamide (APAM) has a linear-chain structure. Amide group has a high chemical activity which can forms a series of derivatives with many kinds of compounds. Anionic Polyacrylamide (APAM) has effects of flocculation, thickening, drag reduction, adhesive, colloidal stabilizing, filming and preventing scale.

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.

Which Polyacrylamides are used in chemistry?

Three polyacrylamides (Sigma-Aldrich) were used as received: two non-ionic polyacrylamides (PAM N, with manufacturer quoted MW values of 40 kg/mol and 5000–6000, ∼5500 kg/mol) and an anionic poly (acrylamide-co-acrylic acid) (PAM A, with manufacturer quoted MW of 520 kg/mol and approximately 80:20 mol% acrylamide:acrylic acid monomers).

Does polyacrylamide behave at oxide-aqueous solution interfaces?

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. Thus, an investigation of polyacrylamide behaviour at oxide-aqueous solution interfaces is of vital importance.

Can polyacrylamide adsorption be quantified at different pH values?

In this work, the adsorption of different molecular weight polyacrylamides onto iron oxides and silica was quantified at different pH values. Mineral oxides were characterised by zeta potential, particle size distribution, scanning electron microscopy images and X-ray diffraction.