What factors affect adsorption of Pam onto sepiolite from aqueous solutions?

The adsorption of PAM onto sepiolite from aqueous solutions has been investigated systematically as a function of some parameters such as calcination temperature of sepiolite, pH, ionic strength and temperature.

What is the adsorption capacity of cationic polyacrylamide (PAM)?

The adsorption of cationic polyacrylamide (PAM) increases with pH from 5.50 to 11.00, temperature from 25 to 55 °C and ionic strength from 0 to 0.1 mol L −1. The sepiolite sample calcined at 200 °C has a higher adsorption capacity than the other calcined samples.

What is the nature of ammonium ion adsorption by sepiolite?

Nature of ammonium ion adsorption by sepiolite: analysis of equilibrium data with several isotherms Properties and applications of palygorskite-sepiolite clays Adsorption of polyelectrolytes onto oxides-the influence of ionic strength, molar mass, and Ca 2+ ions Colloid. Surf.

Does sepiolite have a positive zeta potential?

Sepiolite is slightly negatively charged in this pH range, the adsorption of a large amount of positively charged PAM onto the surface of sepiolite gives rise to a reversal in zeta potential. As more positively charged PAM is attached onto the particle surface, the zeta potential becomes more positive.

Is adsorption of Pam entropic or enthalpic?

The data not only indicate that the adsorption of PAM onto sepiolite is not only more favorable at elevated temperatures, but also suggest that the adsorption process is dominated by entropic rather than enthalpic effects since |Δ H °| < | T Δ S °|. 3.7. Desorption experiments

What are the properties and applications of palygorskite-sepiolite clays?

Properties and applications of palygorskite-sepiolite clays Adsorption of polyelectrolytes onto oxides-the influence of ionic strength, molar mass, and Ca 2+ ions Colloid. Surf. A, 163 ( 2000), pp. 45 – 53