期刊
HOLZFORSCHUNG
卷 67, 期 4, 页码 387-394出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/hf-2012-0108
关键词
Al2O3; configuration of adsorbed molecules; dispersing mechanism; Freundlich equation; Langmuir equation; lignosulfonate (LS); sodium lignosulfonate (NaLS); X-ray photoelectron spectroscopy (XPS)
资金
- National Science Foundation for the National Basic Research Program of China 973 [2010CB732205]
- National Natural Science Funds for Distinguished Young Scholar of China [20925622]
- National Natural Science Foundation of China [21176096, 21006036]
- Natural Science Foundation of Guangdong Province of China [8351064101000002]
- Science and Technology Project of Guangdong Province of China [(2010)A080804020]
The adsorption behavior and dispersion efficiency of sodium lignosulfonate (NaLS) on Al2O3 particles at different pH values were investigated by UV-Vis spectroscopy, zeta potential measurement, X-ray photo-electron spectroscopy, and viscosity measurements. The effects of the additives urea, Na2SO4, and NaCl were tested. At low pH values, NaLS adsorbed on the Al2O3 particles in the form of aggregates and at high pH values as separated single molecules. At pH 3-11, the adsorption was not affected through addition of urea, ruling out hydrogen bond as a controlling factor. By adding Na2SO4 and NaCl, the main driving force was the synergistic effect of the electrostatic interaction and the metal cation-pi interaction at pH < pH(IEP) (IEP, isoelectric point), whereas the metal cation-pi interaction was dominant at pH > pH(IEP). The dispersing mechanism was mainly attributed to the steric hindrance (at pH < pH(IEP)) and the electrostatic repulsive force (at pH > pH(IEP)) owing to the differences in the aggregation state of the adsorbed molecules.
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