The point of zero charge and sorption of cadmium (II) and strontium (II) ions on synthetic hydroxyapatite
The point of zero charge and sorption of cadmium (II) and strontium (II) ions on synthetic hydroxyapatite
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DOI：
10.1016/s1383-5866(99)00066-0
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发表时间：
2000-05
影响因子：
8.6
通讯作者：
I. Smičiklas;S. Milonjić;P. Pfendt;S. Raičević
中科院分区：
文献类型：
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作者：
I. Smičiklas;S. Milonjić;P. Pfendt;S. Raičević
研究了合成的结晶良好的羟基磷灰石的表面性能。以kno3为背景电解质，采用间歇平衡技术测定了不同固液比下的零电荷点（pHPZC）。研究发现，固液比从1:100降低到1:500，导致phpzc分别从6.1降低到4.1。在研究范围内（5-7），Cd2+离子的吸附不受初始pH值的影响，而在更宽的pH范围内（4.5 - 11.5），Sr2+离子的吸附仅取决于初始pH值高于10，即最终pH值高于4.5。当溶液pH高于phpz时，表面负电荷形成，导致更有效的阳离子吸附。
Surface properties of synthetic well-crystallized hydroxyapatite were investigated. Points of zero charge (pHPZC) for different solid to solution ratios were determined by the batch equilibration technique, using KNO3as a background electrolyte. It has been found that the decrease in solid to solution ratio from 1:100 to 1:500 leads to a decrease in pHPZCfrom 6.1 to 4.1, respectively. Sorption of Cd2+ions is not influenced by the initial pH value in the investigated range (5–7), while sorption of Sr2+-ions, determined in the wider pH range (4.5–11.5), depends only on the initial pH higher than 10, i.e. final pH values higher than 4.5. Negative surface charge established when pH of the solution is higher than pHPZCleads to a more effective cation sorption.