Method for preparing ordered mesoporous carbon loaded nano zero-valent iron composite material

Abstract

Disclosed is a method for preparing an ordered mesoporous carbon loaded nano zero-valent iron composite material. The whole process of the method is performed under the protection of nitrogen. The method comprises the steps of (1) dissolving ferric salts and ordered mesoporous carbon in an aqueous ethanol solution to prepare a mixed solution; (2) adding a dispersing agent in the prepared mixed solution, and adjusting the pH to 6.0-6.8; (3) adding dropwise a NaBH4 or KBH4 solution in the mixed solution, and stirring continuously for reaction after adding dropwise; and (4) separating and drying the composite material in the mixed solution to obtain the ordered mesoporous carbon loaded nano zero-valent iron composite material of the required load rate. The method is simple in process, low in cost, simple in required equipment and easy to implement. The prepared material has the advantages of small particle sizes and high surface activity and reducibility of nano zero-valent iron as well as ordered hole ways, large specific surface area and high adsorbability of ordered mesoporous carbon simultaneously. The method can be widely applied to treatment and restoration of water environments.

Description

technical field [0001] The invention relates to a method for preparing an ordered mesoporous carbon-loaded nanometer zero-valent iron material, which belongs to the technical field of mesoporous material preparation. Background technique [0002] The particle size of nanometer zero-valent iron is 1-100nm, the particles are small, the specific surface area is large, and it has strong adsorption; the electrode potential E 0 (Fe 2+ / Fe)=-0.44V, with high electronegativity and high reactivity. Due to the reduction, adsorption, flocculation and precipitation functions of nano-zero-valent iron at the same time, it has been widely used in the field of environmental governance and restoration. Although nanometer zero-valent iron has surface effect, volume effect, quantum effect, small size effect and strong reducibility, nanometer zero-valent iron without modification on the surface is easy to agglomerate, and the particle size distribution is uneven; Easily oxidized, even sponta...

AI Technical Summary

Problems solved by technology

[0009] The Fe prepared by this method 0 / OMC materials, in which most of the nano-zero-valent iron particles are coated in the ordered mesoporous carbon matrix, and the distribution of nano-zero-valent iron particles on the surface of the pores is very limited, thereby reducing the reactivity of the material

Secondly, in this method, the nano-zero-valent iron particles are the precursor of iron (Fe 2+ or Fe 3+ ) reduced to Fe 0 Therefore, when the loading of iron increases, the carbon source consumed for reduction also increases correspondingly, which will easily cause the collapse of pores.

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