期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 444, 期 -, 页码 144-152出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2013.12.039
关键词
Potentiometric titration; Fouling; Magnetite; Hematite
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Natural Resources Canada (NRCan) Office of Energy Research and Development
- Atomic Energy Canada Limited (AECL) through the NSERC/NRCan/AECL Generation IV Energy Technologies Program
Potentiometric titration using a high temperature and high pressure ZrO2 based pH probe connected to an external pressure balanced reference electrode (EPBRE) was employed to measure the surface charge and point of zero charge (PZC) of magnetite and hematite colloids at temperatures up to 200 degrees C. Background-corrected titration data for magnetite and hematite particles were obtained in NaClO4 solutions at ionic strengths of 0.1 and 0.01 which permitted the approximate estimation of PZC using the inflection point of the titration plots (pH(infl)). When temperature increased from 100 degrees C to 200 degrees C, the pH(infl) for magnetite and hematite decreased from 6.08 +/- 0.1 to 4.84 +/- 0.1 and 7.17 +/- 0.1 to 5.74 +/- 0.1, respectively. (C) 2013 Elsevier B.V. All rights reserved.
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