The 6th International Conferenceon on Interfaces Against Pollution

Speciation characterization and coagulation of poly-silica-ferric-chloride: Therole of hydrolyzed Fe(III) and silica interaction

Jian Shi , Yan Zhang , Kaiyun Zou , Feng Xiao


Received June 30, 2010,Revised October 26, 2010, Accepted , Available online

Volume 23,2011,Pages 749-756

  • Summary
  • References
  • Related Articles
The highly e cient inorganic polymer flocculants (IPFs) of the ferric-silica system is a new and promising coagulant. Interactions between ferric species and silica play a large part in the coagulation of suspensions. These e ects are quite distinct from those associated with polymeric or colloid silica. However, although these species are key to coagulation e ciency, they have not been comprehensively discussed. A new type of coagulant, poly-silica-ferric-chloride (PFSC), was synthesized by co-polymerization and characterized by time complexation spectroscopy and photon correlation spectroscopy. Compared with traditional ferric salt, the results indicated that PFSC had a higher molecular weight, lesser positive charge, lower Feb and higher Fec. The higher the Si/Fe ratio, the higher the silica and lower the silicac found. The PFSC with appropriate polysilica acid not only obtained better coagulation/flocculation e ciency in turbidity removal, enhanced the flocculation index (FI) and provided less residual ferric, it also lowered water treatment costs compared to traditional ferric salt. Results showed that PFSC could remove colloid particles in water by charge neutralization and sweeping, adsorption bridging mechanism.

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.京ICP备05002858号-3