Studies On Nanometer MCM-41 Host-(Dibromo-p-chloro-arsenazo) Guest Nanocomposite Material And Phenylating Nanometer MCM-41 Material

The nanometer MCM-41 molecular sieve was prepared by a hydrothermal method using tetraethyl orthosilicate as a silica source and cetyltrimethylammonium bromide as a structure-directing agent.(MCM-41)-(Dibromo-p-chloro-arsenazo,DBC-arsenazo) host-guest composite materials were prepared by liquid-phase grafting method using the calcined host material MCM-41 molecular sieve and the DBC-arsenazo guest in water medium.By means of chemical analysis,powder X-ray diffraction,Fourier transform infrared spectroscopy,low-temperature nitrogen adsorption-desorption technique,solid state diffuse reflectance absorption spectroscopy and luminescence studies,the incorporation of the guest into the host was characterized.The results showed that the guests were sucessfully encapsulated in the channels of the host molecular sieves and the frameworks of the molecular sieves in the prepared composite materials were intact.The prepared host-guest nanocomposite materials have luminescence property and thus have potential applicable prospect as luminescence materials.Phenylation mesoporous molecular sieve MCM-41[Ph-(MCM-41)]was synthesized by post-synthesis method using phenyltrimethoxysilane as coupling agent.The product was characterized by means of element analysis,powder X-ray diffraction,Fourier transform infrared spectroscopy,low-temperature nitrogen adsorption-desorption technique, thermogravimetry-differential thermal analysis method.The results showed that phenyl group has been successfully grafted to the mesoporous molecular sieve MCM-41.The modified MCM-41 mesoporous molecular sieve still retains good structure of channels and possesses high thermal stability.The prepared Ph-(MCM-41) has potential applicable prospect as catalystic material.