Preparation And Adsorption Performance Of Metal Oxide Porous Carbon Composite Materials

With the rapid development of the modernization of human society,the consumption of petrol is growing and the organic sulfide combustion in the gasoline had resulted serious pollution to the environment.so the desulphurization of fuel became important to protect the environment.In various desulfurization technologies,the adsorption desulphurization has attracted much attention owing to its low energy combustion and cycled usage of the adsorbents.This paper focuses on the preparation of the metal oxide composite carbon materials and these adsorption properties.This paper is mainly divided into three parts.The first two parts use porous carbon and nitrogen-doped mesoporous carbon as carrier to support copper nitrate.The effects of copper loading and calcination temperature on the structure of the composites and the amount of monovalent copper ions generated were investigated,as well as the adsorption removal of sulfur-containing organic compounds thiophene and benzothiophene in gasoline from the copper oxide composites.In the third part,the nitrogen-rich mesoporous carbon was used as the matrix to support the metal salt,and the influence of the type of the metal salt on the structure and properties of the resulting composite oxide was investigated in the calcination process.In the first part of this paper,the porous carbon prepolymer was prepared by hydrothermal synthesis by using phenolic resin as carbon source and F127 as template.The porous carbon prepolymer and the carbon obtained after calcination at 600°C were used as carriers respectively.Copper nitrate was loaded by impregnation method,and copper oxide porous carbon material was calcined at different temperatures under the protection of nitrogen gas.The physicochemical properties of the prepared samples were characterized by powder diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR）,thermogravimetric analysis（TG）,transmission electron microscopy（TEM）,and nitrogen adsorption-desorption isotherms.And the ability of the adsorption desulphurization had been tested by removing the organosulfide thiophene and benzothiophene in the simulated oil.The results showed that the cuprous oxide carbon materials,prepared by calcination at 300℃with porous carbon as support,can reach 0.061 and 0.57 m mol·g^-1 in thiophene and benzothiophene solution respectively.The second part of the paper,the N-doped mesoporous carbon prepolymer was prepared by using the resorcinol as carbon source and the melamine as nitrogen source and F127 as the mesoporous template.The prepolymer of N-doped mesoporous carbon and the N-doped mesoporous carbon materials prepared by calcination at 600℃from the prepolymer were used as the supports to load copper nitrate respectively.Copper nitrate was loaded by impregnation method,and copper oxide porous carbon material was calcined at different temperatures under the protection of nitrogen gas.The structure of N-doped mesoporous carbon was characterized by nitrogen adsorption isotherm and transmission electron microscopy and the results showed that the N-doped mesoporous carbon with the pore diameter 3.9 nm was successfully prepared.The adsorption experiment results show that the materials prepared by calcination at 400℃with the N-doped mesoporous carbon as support exhibits well adsorption ability with 0.062 m mol·g^-1 and 0.68 m mol·g^-1 in thiophene and benzothiophene solution respectively.In the third parts of this paper,the N-doped carbon using was prepared by using complexing precipitation method with phenolic resin as carbon source,melamine as nitrogen source.Co-complexation precipitation method for in-situ loading of different metal salts The different metal salts were added in the process for in-situ loading of different metal salts.After calcined under nitrogen atmosphere at different temperature,the metal oxide mesoporous carbon nitrogen composite was obtained.The physical properties of the samples were characterized by XRD,TEM,N₂ adsorption-desorption isotherm.The adsorption of the organic dye rhodamine B was used to test the adsorption ability of these materials.The experimental results show that the metal oxide carbon nitrogen composites materials prepared by calcination at 800 ^oC own high surface area with mesoporous structure with addition of the ferric nitrate and ferric chloride in the complexing precipitation process.And this Fe-N doped mesoporous carbon composite materials show good adsorption to rhodamine B.