Evaluation of the physical properties and photodegradation ability of titania nanocrystalline impregnated onto modified kaolin
✍ Scribed by Vipasiri Vimonses; Meng Nan Chong; Bo Jin
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 757 KB
- Volume
- 132
- Category
- Article
- ISSN
- 1387-1811
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✦ Synopsis
In this study, a microporous layer photocatalyst of titania nanocrystallites heterocoagulated with structurally modified kaolin (TiO 2 -K) was synthesised via a modified sol-gel method. Physical properties (particle size, morphology, stability and settleability) and photodegradation capacity of the TiO 2 -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 TiO 2 nanocrystallites were uniformly deposited on the kaolin external surface, resulting in a high degree of photon activation. Compared to the commercial TiO 2 P25, the TiO 2 -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 TiO 2 -K was regenerated by a thermal treatment. The TiO 2 -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.