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1、pH值及电解质对水体中胶体颗粒Zeta电位的影响pH值及电解质对水体中胶体颗粒Zeta电位的影响【摘要】：介绍了关于pH值及电解质影响水中胶体Zeta电 位的研究并讨论了其原因。【关键字】：pH值电解 质胶体Zeta电位1.前言电位在许多基础理论教学中都 是一个非常重要的概念，电位的大小是衡量胶体粒子稳定 性的重要参数，在胶体稳定理论中占有非常重要的地位。 天然水或饮用水体系中往往含有大量悬浮体，这些悬浮体 通过吸附/解离等方式而带上一定量电荷，而带电量的多少 影响胶体粒子的稳定性，从而影响水质。通过Zeta电位的 测定不仅可以判断水中胶体粒子的稳定性，而且还可以用 来1 选择合适的絮凝剂和监
2、测最佳絮凝条件。不同条件下 水体中常会含有一些无机盐和各种各样的表面活性物质， 因此研究水体中胶体颗粒Zeta电位的影响因素对于控制胶 体聚沉具有重要意义。本文主要介绍了关于pH值及阳离子 对水体中胶体颗粒Zeta电位影响的研究，并讨论了其不同 影响的原因。2. pH值的影响pH不仅直接影响到胶体颗 粒的表面电荷，而且影响水环境中某些物质的性质及存在 形态，是影响Zeta电位的最重要因数之一。2根据蒋展 鹏等的研究发现，同种胶粒尽管由于来源、准备方法的不 同而受pH值的影响不同，但是Zeta电位与pH值的关系曲 线的总体形状却非常相似。其Zeta电位随着pH值的增大 而减小。3根据王慧云等的p
3、H对蒙脱土 Zeta电位的影 响，在实验pH值范围内(pH=311)，蒙脱土表面Zeta电位 皆为负值，并且随着pH值升高负值增加。-这是因为当pH 值增加时，越来越多的OH吸附到蒙脱土表面;并且蒙脱土 表-面的羟基或边缘断键处产生的羟基也与更多的OH反 应，从而使蒙脱土表面的1/6页4双电层结构发生了变 化，其Zeta电位随pH值升高负值增加。Min Hoon Baik等 的实验也同样证明了，当pH值升高，3种不同离子强度下 的膨润土胶体体系的Zeta电位是随之减少的。5而Maria Zaucha等的实验，当水环境中的pHimgsrc=data:image/jpg;base64,/9j/4A
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