Synthesis and structural and photocatalytic properties of TiO₂/montmorillonite nanocomposites

详细信息    查看全文

• 作者：Robert Kun ; Ká ; roly Mogyor&#xf3 ; si and Imre Dé ; ká ; ny
• 关键词：Titanium-dioxide ; Sol– ; gel method ; Na-montmorillonite ; Nanocomposite ; X-ray diffraction ; Photocatalysis ; Phenol
• 刊名：Applied Clay Science
• 出版年：2006
• 出版时间：April 2006
• 年：2006
• 卷：32
• 期：1-2
• 页码：99-110
• 全文大小：732 K

文摘

TiO₂ was prepared by sol–gel method and the sol obtained was used for heterocoagulation of Na-montmorillonite at several different mass ratios, resulting in nanocomposites of various compositions. The TiO₂ content of the samples ranged from 20 % to 75 % (m/m). Heterocoagulation was performed using a strongly acidic (pH = 1) as well as a weakly acidic (pH = 4) Ti(OH)₄/TiO₂ sol. X-ray diffraction measurements of the samples reveal that in the course of composite formation, TiO₂/montmorillonite intercalation structures containing the anatase phase of TiO₂ were formed. The specific surface areas of the samples determined by nitrogen adsorption ranged from 120 to 290 m²/g. TiO₂/montmorillonite composites prepared at pH = 1 have higher specific surface areas than those prepared using the sol with pH = 4. The catalytic properties of TiO₂/montmorillonite composites were tested in the photooxidation of phenol. The TOC data presented show that the photocatalytic efficiency of TiO₂ can be significantly enhanced by intercalation in montmorillonite support.