Synthesis And Characterization Of Noble Metal/Fe₂O₃@Mesoporous Carbon Nanospheres

Mesoporous nanomaterials are porous materials with pore structure.The pore size is about 2-50 nm between micropores and macropores with significant surface effect.In recent years,mesoporous nanomaterials have become a hot research material for researchers,because of its dual characteristics of porous materials and nanomaterials,such as high specific surface area,flowability,internal and external surface modification and adjustable pore size.Thus,it has been widely used in electronic conduction,chemical sensing,biocompatibility,catalysis,separation and so on.Core-shell structure is a very unique and representative structure in today's chemical research direction.Its structural particularity integrates the outer shell and the inner core material.The two relatively independent and relatively unified parts work together to help each other.In the gas storage separation,photoelectrocatalysis or other sides play a good potential value.With the rapid development of synthetic chemistry,the research of core-shell mesoporous nanomaterials is increasing day by day.The diversity of human thinking and the diversity of synthetic methods make these new structures develop rapidly.The most representative material is core-shell mesoporous silicon nano-materials and core-shell carbon nano-materials,these two categories.With the unremitting efforts of previous researchers,sol-gel method,double-surfactant method,microwave synthesis method have been successfully synthesized mesoporous silicon nanomaterials and core-shell silica mesoporous nanomaterials with different sizes,tunable pore sizes applied in medical,biological and environmental fields.At the same time,the synthesis methods of mesoporous carbon nanomaterials and core-shell mesoporous carbon nanomaterials are less than those of mesoporous silica materials.The method has been reported relatively with cumbersome operation and complex process.In summary,taking into account the simplicity of synthesis methods,a new way to prepare core-shell carbon mesoporous nano-materials which have metal(metal oxide)as core and mesoporous carbon as shell,is developed by improving experimental steps.In this paper,the core-shell mesoporous nanospheres of precious metal(gold,silver and platinum)/ferric oxide are prepared by simple and effective synthesis.The morphology,pore structure and chemical composition of core-shell carbon mesoporous nanomaterials were studied by scanning electron microscopy,transmission electron microscopy,XRD and nitrogen adsorption.In addition,we try to study its behavior in the oxidation of carbon monoxide by using part of core-shell mesoporous carbon nanomaterials as a catalyst.By adjusting the influencing factors of synthesized system,we have successfully synthesized core-shell mesoporous carbon nanomaterials with different sizes.The core-shell mesoporous nanomaterials with different water and ethanol ratios were characterized by scanning electron microscopy and transmission electron microscopy.In the transmission electron microscopy,we can clearly see metal(metal oxide)as core and carbon with mesoporous channels as shell.The synthesis method can be used to synthesize a series of mesoporous nanomaterials with core-shell structure,which has potential application value and development space in the catalytic aspects.