Sun ZX, Su FW, Forsling W, Samskog PO
Department of Chemical and Metallurgical Engineering, Lulea University of Technology, Lulea, S-971 87, Sweden
J Colloid Interface Sci. 1998 Jan 1;197(1):151-9. doi: 10.1006/jcis.1997.5239.
Surface characteristics of magnetite at 25degreesC 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. pHpzc is about 6. In the presence of excess cations such as Fe2+ or Fe3+, 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. Copyright 1998 Academic Press. Copyright 1998Academic Press
对25摄氏度下水悬浮液中磁铁矿的表面特性进行了系统研究。测得的比表面积和质子结合位点浓度与计算值吻合良好。在没有多价阳离子的情况下，磁铁矿的ζ电位在酸性溶液中呈正值，并随着pH值的增加而变为负值。零电荷点pH约为6。在存在过量阳离子（如Fe2+或Fe3+）的情况下，磁铁矿表面会发生特异性吸附，这对ζ电位值有显著影响。在pH约为4.5时，可溶性铁离子的浓度随着磁铁矿固体浓度的增加而增加，这表明存在一些与表面相关的反应机制。版权所有1998年学术出版社。版权所有1998年学术出版社
