Identification of α-Al2O3 surface sites and their role in the adsorption of stearic acid
Source abstract
Abstract
The adsorption isotherm of stearic acid (SA) on α-Al2O3 previously subjected to dialysis by ion exchange was determined with the aid of LC–MS analysis of the supernatant. The first monolayer saturation occurred at 0.8 %wt of SA and a second monolayer started above 1.6 %wt of SA. The interaction mechanism between α-Al2O3 and SA was investigated by DRIFTS analysis of the coated powder. The surface hydroxyls primarily involved in SA adsorption occupy doubly and triply coordinated sites on the α-Al2O3 surface, as evidenced by the inverse infrared bands at 3750 and 3695 cm−1. The interaction between α-Al2O3 and SA gives rise to bands at 1566 (νasCOO−) and 1468 cm−1 (νsCOO−), as well as bands at 1415 (ν+δCOH) and 1320 cm−1 (OH···H). It is proposed that adsorption of stearic acid on α-alumina occurs predominantly through electrostatic interactions and hydrogen bonding, without exchange reaction and direct complexation with surface Al cations.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Polymer Surface Interaction Studies · Electrostatics and Colloid Interactions · Nanopore and Nanochannel Transport Studies
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