ZETA-POTENTIAL MEASUREMENT OF MUSCOVITE MICA BASAL-PLANE AQUEOUS-SOLUTION INTERFACE BY MEANS OF PLANE INTERFACE TECHNIQUE
ZETA-POTENTIAL MEASUREMENT OF MUSCOVITE MICA BASAL-PLANE AQUEOUS-SOLUTION INTERFACE BY MEANS OF PLANE INTERFACE TECHNIQUE
复制标题
DOI：
10.1016/0021-9797(92)90038-n
复制
发表时间：
1992-09-01
影响因子：
9.9
通讯作者：
JINNAI, K
中科院分区：
文献类型：
--
作者：
NISHIMURA, S;TATEYAMA, H;JINNAI, K
本文用平面界面技术研究了白云母基面在0.001MKCl存在下的Zeta电位随pH的变化，并与熔融石英作了比较。对于平面界面技术，大型白云母云母片的负zeta电位，即，在pH 2 ~ 11的范围内，云母基面的Zeta电位均高于大二氧化硅板的Zeta电位，而在pH 3 ~ 6的范围内，云母基面的Zeta电位显著依赖于pH。在pH值为2至3的范围内，云母基面的zeta电位显示出-80至-60 mV的显著负值，并且对pH值的降低变得更加不敏感。特别是，我们无法观察到云母基面的等电点（iep）的存在，这在纯氧化物的情况下通常从未遇到过。为了比较，对云母和二氧化硅颗粒进行电泳测量。在pH值为3 ~ 11的范围内，云母颗粒的负迁移率zeta电位比熔融石英颗粒的负迁移率zeta电位小，即使云母颗粒上的正电荷氧化铝型位点被十二烷基苯磺酸钠（SDBS）中和也是如此。这一结果与平面界面技术所得到的趋势完全相反。然而，在pH 3下，以十二烷基氯化铵（DAC）作为捕收剂的白云母的浮选回收率的变化与在pH 7.4下，以十二烷基三甲基溴化铵（DTAB）作为捕收剂的结晶石英的浮选回收率的变化非常一致。这一观察结果为在pH 3下通过平面界面技术获得的云母基面的显著负zeta电位（Δ-75 mV）提供了依据。
The zeta potentials of muscovite mica basal plane were investigated by means of the plane interface technique as a function of pH in the presence of 0.001MKCl, compared with those of fused silica. For the plane interface technique, the negative zeta potentials of a large muscovite mica sheet, i.e., the mica basal plane, were uniformly higher in magnitude than those of a large silica plate over the pH range from 2 to 11, whereas the zeta potentials of the mica basal plane were markedly dependent on pH in the pH range of 3 to 6. In the pH range of 2 to 3, the zeta potenteials of the mica basal plane showed remarkably negative values of −80 to −60 mV and became more insensitive to the reduction in pH. In particular, we could not observe the presence of an isoelectric point (iep) of the mica basal plane, which has never been encountered normally in the case of pure oxides. For comparison, the electrophoresis measurements were made for both mica and silica particles. The negative mobility zeta potentials of mica particles were smaller in magnitude than those of fused silica particles in the pH range of 3 to 11 even though the positively charged alumina-type sites on the mica particles were neutralized by sodium dodecyl benzene sulfonate (SDBS). This result was quite the reverse of the trend obtained from the plane interface technique. However, the variation in flotation recovery of the muscovite mica with dodecyl ammonium chloride (DAC) as a collector at pH 3 was very consistent with that of crystalline quartz (ζ ∼ −65 mV) with dodecyl trimethyl ammonium bromide (DTAB) at pH 7.4. This observation provided justification for the remarkably negative zeta potential (∼ −75 mV) of the mica basal plane obtained from the plane interface technique at pH 3.