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.

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.

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 molecular weight affect adsorption capacity of polyacrylamide?

All three polyacrylamides had similar adsorption capacity on the iron oxides particles, thus minimal influence of molecular weight was observed. The adsorption isotherms were fit to the Langmuir model to facilitate interpretation of the adsorption mechanism.

Can adsorption of hydrolysed polyacrylamide be optimised on steel slag?

Response surface methodology approach for the optimisation of adsorption of hydrolysed polyacrylamide from polymer-flooding wastewater onto steel slag: a good option of waste mitigation.

Why is Pam n adsorption higher on iron oxides?

Covalent bonding may also be considered one of the factors leading to higher adsorption of PAM N on iron oxides. Previously reported IR and Auger spectroscopic evidence demonstrated the presence of chemical bonds between ferric ions on the solid surface and amide group of a hydrolysed polyacrylamide (Jin et al., 1987).