Surface characteristics of magnetite in aqueous suspension
- 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
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