Effect of natural organic coatings on the polymer-induced coagulation of colloidal particles

被引:15
作者
Bob, MM [1 ]
Walker, HW [1 ]
机构
[1] Ohio State Univ, Dept Civil & Environm Engn & Geodet Sci, Columbus, OH 43210 USA
关键词
natural organic coatings; polymer-induced coagulation; colloidal particle;
D O I
10.1016/S0927-7757(00)00679-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this research, we investigate the effect of natural organic coatings of humic acid on the flocculation of well-characterized amidine polystyrene latex microspheres by a polymeric flocculent (polyvinyl alcohol, or 'PVA'). Our results demonstrate that in the absence of humic acid. PVA effectively coagulates the particles as a result of polymer bridging interactions. When the particle surface is saturated with humic acid, however, the latex particles are stable at all dosages of PVA tested, presumably as a result of repulsive electrostatic interactions between primary particles and a decrease in the number of active sires available for bridging. At low humic acid surface coverage, on the other hand, an increase in PVA-induced coagulation is observed compared with when PVA is the sole polymer in the system. Here, both polymer bridging and electrostatic interactions appear to play a role in controlling the coagulation rate of these particles. Our results suggest that the predominance of polymer bridging in natural systems may depend on the preferential displacement of low molecular humic and fulvic acids and/or favorable interactions between large macromolecules and particle surfaces coated with humic materials. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:215 / 222
页数:8
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