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

A nano-zero-valent iron and composite material technology, applied in the field of mesoporous material preparation, can solve the problems of reduced material reactivity, channel collapse, limited nano-zero-valent iron particles, etc., to reduce storage and transportation costs, improve stability, Equipment simple effect

Inactive Publication Date: 2013-08-14
SHANDONG UNIV
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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 th

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This example uses FeCl 2 4H 2 O, NaBH 4 and polyethylene glycol 4000 to prepare ordered mesoporous carbon-supported nano-zero-valent iron composites with a loading rate of 20%.

[0024] (1) 1.2791g FeCl 2 4H 2 O and 1.7997g of ordered mesoporous carbon (that is, the mass ratio of Fe to C is 1:5) were dissolved in 90mL of 80% ethanol aqueous solution and stirred for 30 minutes;

[0025] (2) Add 0.3g PEG-4000 to the above mixture, and adjust the pH of the mixture to 6.5 with 0.1mol / L NaOH solution;

[0026] (3) Add 1.7354g KBH 4 Dissolve in 64.3mL deionized water (to make KBH with a concentration of 0.5mol / L 4 solution), added to the mixture at a rate of 1 drop / second, the added KBH 4 The molar amount of the iron ion is 5 times that of the iron ion. After the addition, the stirring reaction is continued for 60 minutes, and the ordered mesoporous carbon-loaded nano-zero-valent iron composite material can be generated;

[0027] (4) Separation of ordered mesoporous c...

Embodiment 2

[0031] In this example, Fe 2 (SO 4 ) 3 , NaBH 4 and polyethylene glycol 6000 to prepare ordered mesoporous carbon-supported nano-zero-valent iron composites with a loading rate of 10%.

[0032] (1) 1.2871g Fe 2 (SO 4 ) 3 Dissolve 3.6040g of ordered mesoporous carbon (that is, the mass ratio of Fe to C is 1:10) in 90mL of 80% ethanol aqueous solution, and stir for 30 minutes;

[0033] (2) Add 0.3g of polyethylene glycol 4000 (PEG-6000) to the above mixture, and adjust the pH of the mixture to 6.0 with 0.1mol / L NaOH solution;

[0034] (3) Add 1.2177g NaBH 4 Dissolve in 64.3mL deionized water (to make NaBH with a concentration of 0.5mol / L 4 solution), added to the mixture at a rate of 1 drop / second, the added NaBH 4 The molar amount of the iron ion is 6 times that of the iron ion. After the addition, the stirring reaction is continued for 30 minutes, and the ordered mesoporous carbon-loaded nano-zero-valent iron composite material can be generated;

[0035] (4) Separation...

Embodiment 3

[0038] This embodiment adopts Fe(NO 3 ) 3 9H 2 O and polyvinylpyrrolidone-K30 to prepare ordered mesoporous carbon-supported nano-zero-valent iron composites with a loading rate of 30%.

[0039] (1) 2.6000g Fe(NO 3 ) 3 9H 2 O and 1.2013g of ordered mesoporous carbon (i.e. the mass ratio of Fe to C is 3:10) were dissolved in 90mL of 80% ethanol aqueous solution and stirred for 30 minutes;

[0040] (2) Add 0.3g polyvinylpyrrolidone-K30 (PVP-K30) to the above mixture, and adjust the pH of the mixture to 6.8 with 0.1mol / L NaOH solution;

[0041] (3) Add 1.7354g KBH 4 Dissolve in 64.3mL deionized water (to make KBH with a concentration of 0.5mol / L 4 solution), added to the mixture at a rate of 2 drops / second, the added KBH 4 The molar amount of the iron ion is 4 times that of the iron ion. After the addition, the stirring reaction is continued for 90 minutes, and the ordered mesoporous carbon-loaded nano-zero-valent iron composite material can be generated;

[0042] (4) Se...

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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...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 许春华王晓红林盛
Owner SHANDONG UNIV
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