Utilization of e-waste as a silica source for the synthesis of the catalyst support MCM-48 and highly enhanced photocatalytic activity of supported titania nanoparticles

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• 作者：Tzong-Horng Liou ; ^{thliou@mail.mcut.edu.tw} ; Bo-Chen Lai
• 关键词：E-waste ; Titania ; MCM-48 ; Photocatalyst ; Mesoporous structure
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：5 April, 2012
• 卷：115-116
• 期：Complete
• 页码：138-148
• 文件大小：1444 K

摘要

An extensive range of studies has investigated the silica-supported TiO₂ catalyst. However, research on cubic-type MCM-48 photocatalyst materials is limited. E-waste represents one of the fastest-growing sources of industrial waste worldwide. The present study reports, for the first time, direct synthesis of TiO₂ nanoparticles loaded on MCM-48 deriving from e-waste. Alkali-extracted electronic packaging resin ash provided a source of sodium silicate precursors. Titanium salts were introduced into the pores of MCM-48 and subsequently decomposed to TiO₂ nanoparticles. Methylene blue was used to evaluate the photoactivity of the hybrid catalyst at varying amounts of TiO₂ loading, catalyst masses, and heat-treatment temperatures. Results indicated that TiO₂/MCM-48 demonstrates a combined effect, including the photocatalytic activity of TiO₂ along with the high adsorptive efficiency of MCM-48. Different ratios of titanium metal deposited on silica surfaces had significant influences on the porosity and adsorption properties of the MCM-48 support, as well as the dispersion, particle size, and catalytic activity of the TiO₂ catalyst. Good dispersion of TiO₂ on the MCM-48 support played a significant role in obtaining high photocatalytic activity. Synthesis of mesoporous photocatalysts from e-waste using a green approach can reduce the disposal problem and produce viable materials for a wide range of applications.