Colloidal titanium dioxide separation from water by foam flotation

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16 Citations (Scopus)


Colloidal titanium dioxide (TiO2) was separated from an aqueous suspension (1000 ppm) by foam flotation using cationic or anionic surfactants. The effects of surfactant dosage, suspension pH value, suspension ionic strength, and gas flow rate on the dispersed-air flotation of colloidal TiO2 were investigated. TiO2 separation was almost complete in optimum conditions. It was found that the coulombic interaction between charged TiO2 particle surfaces and ionic collectors plays a dominant role in this system. Both flotation rate and foamate volume are dependent upon the gas flow rate. Foam flotation may find application in the separation of submicron TiO2 particles in suspend-photocatalyst systems.

Original languageEnglish
Pages (from-to)2623-2635
Number of pages13
JournalSeparation Science and Technology
Issue number16
Publication statusPublished - 1998

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation


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