Adsorption of sodium/calcium poly(acrylic acid) salts on anatase: effect of the polyelectrolyte molecular weight and neutralization

• Autorzy: Jacquemet Christian

Identyfikatory

DOI

10.5277/ppmmp19087

• Języki publikacji: EN

Abstrakty

EN

Abstract: Interactions of poly(acrylic acid)s (PAAs) of two different molecular weights (Mw = 9,560 g×mol-1 and 4,220 g×mol-1) with surfaces of an untreated anatase TiO2 were assessed through adsorption isotherm measurements. Those dispersants were tested under different sodium-calcium neutralization states (molar ratio r = Ca²⁺/CO_2- varying from 0 to 0.35). Their behavior towards the TiO2 surfaces can be described by the Langmuir adsorption model. For both polymers, surface coverage (Γ_max) evolves linearly with the molar ratio r. For a given r value, a lower surface coverage was observed with the polymer having the highest molecular weight. The free energy of adsorption (ΔG_ads) of PAAs was estimated from adsorption experiment data. This calculation indicates that sorption occurs spontaneously and is unlikely to be of chemical nature. The absolute values of ΔG_ads are higher for the highest molecular weight polymers suggesting that they are more strongly adsorbed to anatase surfaces. The absolute values of ΔG_ads per mole of sodium-calcium macromolecules are found to be lower than those calculated for their homologues 100% sodium neutralized suggesting that they are bound with the solid by a fewer number of segments.

Słowa kluczowe

EN

adsorption; free energy; Langmuir isotherm; sodium-calcium poly(acrylic acid) salts; anatase

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2020
• Tom: Vol. 56, iss. 1
• Strony: 113--123
• Opis fizyczny: Bibliogr. 40 poz., rys., tab.

Twórcy

autor

Jacquemet Christian

• COATEX, ARKEMA Group - 35 rue Ampère, B.P. 8, Genay 69730, France

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).