期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 443, 期 -, 页码 338-344出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2013.11.039
关键词
Zeta potential; Hematite; Electroacoustics; Adsorption; Charge reversal; Concentrated electrolyte solutions
资金
- ASCOPE [ANR-EESI-2009-02]
The behavior of hematite particles and their surface charge in the presence of various electrolytes ranging from 10(-3) to 10 mol L-1 has been investigated. Zeta potential measurements were performed using an electroacoustic device, and results showed that the nature of the alkaline cation in solution (Li+, Na+, K+, Cs+ or tetramethylammonium) leads to the presence or absence of a charge neutralization for higher concentrations. This behavior follows the indirect Hofmeister series (lithium has the strongest effect) and may be attributed to the hard or soft nature of the cation. This effect was also shown by experiments with various anions (OH-, Cl-, Br-, NO3-, ClO4-). Calculations using the classical DLVO theory predicted stability in agreement with the observed macroscopic behavior of the hematite suspensions, and most notably the rate and degree of sedimentation. (C) 2013 Elsevier B.V. All rights reserved.
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