Evaluation of the physical properties and photodegradation ability of titania nanocrystalline impregnated onto modified kaolin

Vipasiri Vimonses, Meng Nan Chong, Bo Jin

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32 Citations (Scopus)


In this study, a microporous layer photocatalyst of titania nanocrystallites heterocoagulated with structurally modified kaolin (TiO2-K) was synthesised via a modified sol-gel method. Physical properties (particle size, morphology, stability and settleability) and photodegradation capacity of the TiO2-K catalyst subject to its synthesis, regeneration and use for water treatment were studied. The modified kaolin, as a support for the titania nanocrystallites had a delaminated sandwich silica structure that minimises chemical intercalation within the nanocomposite structure. Microscopic examination revealed that the TiO2 nanocrystallites were uniformly deposited on the kaolin external surface, resulting in a high degree of photon activation. Compared to the commercial TiO2 P25, the TiO2-K demonstrated a superior photocatalytic degradation capacity to remove an anionic Congo red dye. Its removal efficiency and photo-reaction performance were improved when the TiO2-K was regenerated by a thermal treatment. The TiO2-K particles can be easily separated from the water system for further reuse. This unique nanocomposite photocatalyst shows promising technical advantages for a continuous industrial process of water treatment.

Original languageEnglish
Pages (from-to)201-209
Number of pages9
JournalMicroporous and Mesoporous Materials
Issue number1-2
Publication statusPublished - Jul 2010
Externally publishedYes


  • Kaolin
  • Photocatalysis
  • Sol-gel
  • Thermal regeneration
  • TiO

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