Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 461, Issue -, Pages 212-219Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2014.07.049
Keywords
Zeta potential; Latex; Iron(III) chloride; Dynamic light scattering; Nanoparticle tracking analysis; Coagulant dosage
Categories
Funding
- Swiss National Foundation [200021_135240]
- nanoMILE FP7 project
- Swiss National Science Foundation (SNF) [200021_135240] Funding Source: Swiss National Science Foundation (SNF)
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In water treatment processes, the optimal dosage of coagulant is highly dependent on suspended particle surface charge, size and concentration, pH and composition of water. One way to control the coagulation process can be based on the measurement of the electrophoretic mobility and determination of zeta potential. In this study we investigated the interaction between negatively charged polystyrene latex particles and iron(III) chloride as coagulant. e combined three methods, i.e. dynamic light scattering, nanoparticle tracking analysis, and modeling to thoroughly characterize our system. We have shown that stabilization of zeta potential occurred after 60-80 min after addition of coagulant. We demonstrated different behaviors of latex particles with FeCl3 depending on the dosage of iron ions. The optimal dosage of FeCl3 is equal to 1-2 mg/L for the rapid aggregation of 10 mg/L latex suspension. We found a good agreement between the aggregation rate and surface charge of the latex particles and that charge neutralization mechanism is responsible for particle aggregation. High dosage of coagulant was also found to result in formation of iron(III) hydroxide particles which diameter was about 200 nm. The initial pH is also important for latex particle coagulation. The lower initial pH of suspension is, the more rapidly the isoelectric point is achieved. (C) 2014 Elsevier B.V. All rights reserved.
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