Abstract
The nanostructure of poly(acrylic acid) (PAA) adsorption layer on the surface of mesoporous-activated carbon HPA obtained by physical activation of residue after supercritical extraction of hops was characterized. This characterization has been done based on the analysis of determination of adsorbed polymer amount, surface charge density, and zeta potential of solid particles (without and in the PAA presence). The SEM, thermogravimetric, FTIR, and MS techniques have allowed one to examine the solid surface morphology and specify different kinds of HPA surface groups. The effects of solution pH, as well as polymer molecular weight and concentration, were studied. The obtained results indicated that the highest adsorption on the activated carbon surface was exhibited by PAA with lower molecular weight (i.e., 2000 Da) at pH 3. Under such conditions, polymeric adsorption layer is composed of nanosized PAA coils (slightly negatively charged) which are densely packed on the positive surface of HPA. Additionally, the adsorption of polymeric macromolecules into solid pores is possible.
Highlights
Specific structure of polymeric adsorption layer formed on the solid-liquid interface determines the surface properties of colloidal suspension
The nanostructure of poly(acrylic acid) adsorption layer formed on the activated carbon obtained by physical activation of residue after supercritical extraction of hops (HPA) was characterized
It was demonstrated that poly(acrylic acid) (PAA) with a lower molecular weight (2000 Da) exhibits the highest adsorption at the solid-liquid interface at pH 3
Summary
Specific structure of polymeric adsorption layer formed on the solid-liquid interface determines the surface properties of colloidal suspension. This is very important for stability of highly dispersed system occurring commonly in many areas of human activity (i.e., environmental, agricultural, and industrial applications) [1,2,3,4,5,6,7,8]. The unique conformation of polymeric chain is a consequence of rotation of the atoms or atom groups around a single bond It defines the behavior of the polymer in a solution and results from the interactions of macromolecules with solvent molecules. Changing and controlling of one or more parameters, one can obtain the solid suspension characterized by required stability for specified practical application
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