Effect of polyelectrolyte mixtures on the electrokinetic potential and kinetics of flocculation of clay mineral particles
Effect of polyelectrolyte mixtures on the electrokinetic potential and kinetics of flocculation of clay mineral particles
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DOI：
10.1016/j.colsurfa.2011.01.051
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发表时间：
2011-06-20
影响因子：
5.2
通讯作者：
Skvarla, J.
中科院分区：
文献类型：
--
作者：
Barany, S.;Meszaros, R.;Skvarla, J.
研究了阳离子和阴离子电解质的二元混合物对由高岭土和膨润土颗粒形成的絮凝体的聚集动力学、尺寸和强度的影响，作为聚合物剂量、混合物组成、组分添加顺序和搅拌系统强度的函数。观察到中带电和弱带电聚电解质混合物的絮凝能力具有协同作用；在先添加阳离子聚合物然后添加阴离子聚合物的情况下发现了最大的聚集体。最初的强烈短时间搅拌悬浮液加速了聚集过程并增加了絮凝物的尺寸，与聚合物添加的顺序无关。在阳离子和阴离子聚电解质的混合物中，颗粒的zeta电势由吸附的阴离子聚合物决定，与聚电解质的电荷密度和将混合物组分添加到悬浮液中的顺序无关。所观察到的规律可以通过吸附混合聚合物层中聚电解质构象的特征来解释。 (C) 2011 年由 Elsevier B.V. 出版
The effect of binary mixtures of cationic and anionic electrolytes on the kinetics of aggregation, size and strength of flocs formed from kaolin and bentonite particles as a function of the polymer dose, mixture composition, sequence of the components addition and intensity of stirring the system has been studied. A synergism in the flocculation capacity in mixtures of moderate and weakly charged polyelectrolytes was observed; the biggest aggregates have been found at condition of adding first the cationic polymer then the anionic one. An initial intensive short stirring the suspension accelerates the aggregation process and increases the size of flocs independently of the sequence of polymers addition. In mixtures of cationic and anionic polyelectrolytes, the zeta-potential of particles is determined by the adsorbed anionic polymer independently of the charge density of polyelectrolytes and sequence of addition of the mixture components to the suspension. The laws observed were explained by features of polyelectrolytes conformation in adsorbed mixed polymer layers. (C) 2011 Published by Elsevier B.V.