Surface characteristics of magnetite in aqueous suspension

Journal Article · Thu Jan 01 00:00:00 EST 1998 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1006/jcis.1997.5239· OSTI ID:599745

Sun, Z X; Su, F W; Forsling, W ^[1]; Samskog, P O ^[1]

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1. Luleaa Univ. of Technology (Sweden). Dept. of Chemical and Metallurgical Engineering

Magnetite water interactions are significant in many applications ranging from metal corrosion, heterogeneous catalysts, and mineral processing to waste water cleaning. Surface characteristics of magnetite at 25 C in aqueous suspensions are systematically studied. The measured specific surface area and concentration of proton binding sites correspond well to the calculated values. Zeta potential of magnetite in the absence of multivalent cations exhibits positive values in acidic solution and becomes negative with increasing pH. pH{sub pzc} is about 6. In the presence of excess cations such as Fe{sup 2+} or Fe{sup 3+}, specific adsorption takes place at the surface of magnetite, which dramatically influences the value of zeta potential. The concentrations of soluble Fe ions at pH about 4.5 increase with solid concentrations of magnetite indicating some surface-related reaction mechanisms.

• OSTI ID: 599745
• Journal Information: Journal of Colloid and Interface Science, Vol. 197, Issue 1; Other Information: PBD: 1 Jan 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
MAGNETITE
SURFACE PROPERTIES
WATER TREATMENT
ORE PROCESSING
AQUEOUS SOLUTIONS
SURFACE AREA
SURFACE POTENTIAL
SORPTIVE PROPERTIES
SOLUBILITY