Effects of tourmaline on microstructures and photocatalytic activity of TiO_2/SiO_2 composite powder

• 作 者: 孟军平 梁金生 梁广川 于俊梅 潘艳芬
• 机 构: Institute of Power Source and Ecomaterials ScienceHebei University of Technology Tianjin 300130,Chin
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2006年S2期
• 关键词: photocatalytic powders titania hydrolysis orange resultant silane adsorbed ethan

The SiO2/TiO2 composite powders including mineral tourmaline powders (T/SiO2/TiO2) were prepared from a sol made by a two-step hydrolysis method, using metasilicate ester as precursor. The powders were characterized by scanning electron microscopy (SEM). The photocatalytic activity of the sample was evaluated by the photocatalytic degradation of methyl orange. The effects of heat-treatment on the photocatalytic activity were discussed. It is found that the T/SiO2/TiO2 composite powders show higher photocatalytic activity when including 10% SiO2 and 4% tourmaline. Moreover, the photocatalytic mechanism of tourmaline on the powders was proposed.

The SiO2 / TiO2 composite powders include mineral tourmaline powders (T / SiO2 / TiO2) were prepared from a sol made by a two-step hydrolysis method, using metasilicate ester as precursor. The powders were characterized by scanning electron microscopy (SEM). The photocatalytic activity of the sample was evaluated by the photocatalytic degradation of methyl orange. The effects of heat-treatment on the photocatalytic activity were discussed. It is found that the T / SiO2 / TiO2 composite powders show higher photocatalytic activity when including 10% SiO2 and 4% tourmaline. Moreover, the photocatalytic mechanism of tourmaline on the powders was proposed.