Design,Synthesis And Catalytic Applications Of Mesoporous Silica And Carbon Nanotubes Magnetic Composites

Due to the unique nanostructure,superiorly huge specific surface area and adjustable pore structure,the mesoporous nanomaterials have been widely used and applied widely.However,some traditional mesoporous silica materials are lack of some other important properties.In order to solve these problems,we designed and synthesized carbon/silica composite nanomaterials by making mesoporous silica generating on carbon nanotubes surface.The main research contents of this paper1.The study on synthesis and application of magnetic Carbon/Silica composite nanrods.The magnetic hierarchical Carbon/Silica composite caterpillar-like nanorods,possesing a carbon nanotube mandrel and outer center-radial wrinkled mesoporous silica walls(denoted as CSCNs),were synthesized successfully in the bicontinuous microemulsion.The TEM,SEM,XRD,XPS and BET were applied to analysize its morphology and structure.The CSCNs nanoparticles possesses high surface area and novel opened mesochannels(~20 nm)And a novel catalyst were fabricated by loading Pd nanoparticles on the carrier.This nanocatalyst had a significant catalytic activities for reduction reaction of 2-nitroaniline(2-NA).And also,the catalyst could not only be efficiently but also effortlessly recovered from the reaction mixture by magnet and recycled 10 times without any obvious reduction.2.The study on synthesis and application of magnetic elongated hollow mesoporous silica nanocapsules.The magnetic elongated hollow mesoporous silica nanocapsules(MSNCs)with center-radial pore channels were successfully fabricated for the first time by surfactant-template synthesis approach.And,this novel nanomaterials were characterized by TEM,FTIR,XRD,XPS,VSM and N2 adsorption-desorption.The well-designed mesoporous silica nanocapsules have very high specific surface area and highly opened biggish pore size(8 nm).Silver nanoparticles were located on the materials to catalyze the reduction reaction of 4-nitrophenol.Interestingly,the novel catalysts could be effortlessly recovered by magnetic separation from reaction mixture.