Abstract
The influence of solution pH (in the range 3–9) on the adsorption of polyacrylic acid (PAA) on the mixed silica–alumina surface (SA-3: SiO2 97 %–Al2O3 3 % and SA-96: SiO2 4 %–Al2O3 96 %) was investigated. The following methods were applied in experiments: spectrophotometry, viscosimetry, potentiometric titration, and microelectrophoresis, which enable determination of adsorbed amount of the polymer, thickness of its adsorption layers, surface charge density, and zeta potential of solid particles in the presence and absence of PAA, respectively. The obtained results indicate that rise of solution pH causes the decrease of PAA adsorption and the increase of its adsorption layer thickness on surfaces of both solids. Moreover, significantly higher adsorption of polyacrylic acid was obtained on the SA-96 surface. This is a result of more favorable electrostatic interactions occurring between the adsorbing polymer chains and the SA-96 surface and formation of a greater number of adsorbate-adsorbent connections through hydrogen bridges.
Highlights
The adsorption process of various substances [1,2,3,4] is very important for manyM
Of the two examined mixed oxides (SA-3 and SA-96), significantly greater affinity for the adsorption of anionic polyacrylic acid is exhibited by SA-96
It results from much more favorable electrostatic interactions occurring between the polymer chains and the SA-96 surface
Summary
The adsorption process of various substances (low molecular and macromolecular) [1,2,3,4] is very important for manyM. This can be done based on the experimentally determined parameters, of which the most important are the amount of adsorbed polymer, its adsorption layer thickness, surface charge, and zeta potential of solid particles in the presence of polymer.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
