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Preparation and Catalytic Activities of Highdispersed Nanometal/Montmorillonite Composites

Author: LiXinPing
Tutor: LiuJianJun
School: Beijing University of Chemical Technology
Course: Applied Chemistry
Keywords: Nano Silver Montmorillonite Catalytic degradation Titanium dioxide Pillaring intercalation
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 205
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Abstract


Nanomaterials, because of its unique physical and chemical properties, such as quantum size effect, small size effect and surface effect has been more and more attention. However, due to the high surface energy of the nanopowder it easy to reunite dispersed difficulties which affected their play good nano features, in order to solve this problem, this paper studies the load and stability of nanoscale metal and semiconductor particles in the layered clay carrier problem, and further study of the catalytic properties of these composites. Layered montmorillonite (MMT) as the carrier, Intercalation and Assembly prepared / montmorillonite composites with good dispersion and thermal stability of nano metal / montmorillonite and nano semiconductor, and preparation process, structure and catalytic properties of the system. The study shows that carrier, ascorbic acid as a reducing agent, a mixed solution of ethanol and water as the solvent can be synthesized MMT on the particle diameter of 30-40nm, after peeling of the uniformly dispersed in highly dispersed nano silver montmorillonite / smectite bentonite composite catalyst, and found that the catalyst has excellent room temperature degradation of methylene blue nature. Heat treatment of the catalyst by different temperatures and catalytic activity evaluation, combined with X-ray diffraction (XRD), transmission electron microscopy (TEM) and atomic absorption spectroscopy (AAS) characterization results show that the dispersion of nano-silver on the montmorillonite and The load is a major factor affecting its catalytic activity, the catalyst still has a high catalytic activity in the firing temperature lower than 200 ℃. With different bandgap TiO 2 , SnO 2 the Fe 2 O 3 and Cu 2 O four semiconductor / montmorillonite composite catalyst TiO 2 pillared montmorillonite (TiO 2 / MMT) of methylene blue best photocatalytic degradation activity and methyl orange, its formation pillared structure and TiO 2 is closely related to a suitable bandgap. The study also showed that MMT as a carrier, the use of titanium tetrachloride hydrolysis nano the TiO calcination at 500 ℃ stable structure TiO 2 introduction of MMT < / sub> pillared montmorillonite (TiO 2 / MMT), again by chemical reduction of silver metal supported thereon synthesized containing silver / titanium dioxide column montmorillonite composite photocatalyst (Ag-TiO 2 / MMT). Phase composition by XRD, IR, BET, AAS analysis method of composite photocatalyst material, bonding, were used to characterize the physical and chemical properties than the surface area of ??the element content. The photocatalytic tests show degradation of methylene blue than commercial TiO 2 (P25) higher catalyst Ag-TiO 2 / MMT and TiO 2 / MMT activity catalyst Ag-TiO 2 / MMT commercial TiO 2 (P25) corresponding to degradation of the catalytic activity of the green fruit, and its high activity from the Ag-TiO 2 / MMT column after having a larger specific surface area and by the laser flash photolysis to detect the presence of a relatively long lifetime of the transient in the catalytic system active species.

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