pH dependence of adsorption of n-dodecyl-beta-D-maltoside on solids.
Adsorption of surfactants on solids plays an important role in industrial operations such as separation, lubrication, flotation, dispersion, chemical mechanical polishing, and enhanced oil recovery. In this work, adsorption of a typical biodegradable nonionic surfactant, n-dodecyl-beta-d-maltoside, on solids was studied to explore its potential applications. Even though it is a nonionic surfactant, significant pH-dependence was revealed for the adsorption on alumina in the range from pH 4 to 7. The adsorption density was found to be proportional to the concentration of surface AlOH group among Al(OH(2))(+) and AlO(-) groups. The equilibriums among the surface species are governed by pH through surface ionization reactions. The surface AlOH group evidently determines the formation of hydrogen bonding between the surfactant molecules and the solid surface and thus the adsorption. Similar correlation was also found in the case of hematite. The results help to understand the mechanism of adsorption of sugar-based surfactant on solids.
Lu
Shaohua
S
NSF Industry/University Cooperative Research Center (I/UCRC) for Advanced Studies on Novel Surfactant, Columbia University, New York, NY 10027, USA.
Bian
Yu
Y
Zhang
Lei
L
Somasundaran
Ponisseril
P
D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D005960:Glucosides / Q000737:chemistry*; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D015394:Molecular Structure; D012492:Salts / Q000737:chemistry; D013499:Surface Properties
D005960:Glucosides; D012492:Salts; C040358:dodecyl maltoside; D000537:Aluminum Oxide