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Hollow charcoal and its synthetic method and use

A hollow carbon and hollow technology, which can be applied to other household appliances, applications, household appliances, etc., can solve the problem that the application potential is greatly affected by the shape and pore structure, and achieve the effect of strong adsorption capacity

Inactive Publication Date: 2005-03-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although various carbon materials have been synthesized one after another, because their application potential is greatly affected by their morphology and pore structure, it is necessary to develop more carbon materials with new structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Synthesis of hollow carbon balls: After fully mixing 5ml styrene, 5ml divinylbenzene, and 500mg azobisisobutyronitrile, bubbling nitrogen for 10min, taking spherical silica gel with a particle size of 3μm into the above mixed solution and soaking for 2h After that, it was taken out, sealed, and placed in an oven to react at 343K for 5 hours. Afterwards, the material was taken out and placed in a crucible, and the whole crucible was embedded with activated carbon. Under the condition of isolating air and oxygen, it was burned in a muffle furnace at 1173K for 2 hours. After natural cooling, 5mol / L sodium hydroxide aqueous solution was used The hollow carbon material is obtained by washing three times, the hollow carbon particle size is 3.05 μm, the outer carbon shell thickness is about 50 nm, and the hollow core diameter is 3 μm.

Embodiment 2

[0016] Example 2: Synthesis of hollow carbon spheres: First, a mixture of sucrose and sulfuric acid was prepared according to sucrose: concentrated sulfuric acid: water = 2.5 g: 0.3 g: 10 mL. Soak the 25μm spherical silica gel in this mixed solution, and after it is fully wetted, take it out and dry it. After it is completely dried, start from room temperature at a heating rate of 2K / min to 433K and keep it for 5h to allow the sucrose to be fully dehydrated and carbonized. This process was repeated 5 times to obtain a silica gel-carbon composite material. The composite material is treated with 0.5mol / L KOH aqueous solution or 40% hydrofluoric acid aqueous solution for 3 times to obtain spherical hollow carbon material. The hollow carbon particle size is 26μm, the outer carbon shell thickness is about 1μm, and the hollow core diameter About 25μm.

Embodiment 3

[0017] Example 3: Synthesis of hollow carbon spheres: spherical silica gel with a particle size of 50 nm was immersed in furfuryl alcohol, soaked for 3 hours and then taken out, sealed and reacted at 363K for 15 hours. Repeat this step once. Afterwards, the material was placed in a muffle furnace, and the temperature was raised to 1073K at a rate of 2K / min in a nitrogen atmosphere for 5 hours, and then taken out after cooling to obtain a silica gel-carbon composite material. Use 3mol / L KOH aqueous solution or 5% (HF / H 2 O, v / v) hydrofluoric acid aqueous solution treats the composite material three times to obtain spherical hollow carbon material. The hollow carbon has a particle size of 55 nm, an outer carbon shell thickness of about 15 nm, and a hollow core diameter of 40 nm.

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Abstract

One kind of hollow carbon is spherical and consists of carbon shell and hollow core. The preparation process of the hollow carbon includes adsorbing organic monomer reaction solution to spherical silica gel, initiating reaction to coat the silica gel with organic polymer, carbonizing the organic polymer, and dissolving the silica gel component in the core with alkali solution or acid solution. The hollow carbon in porous structure has great specific surface area and powerful adsorption capacity, and may be used in the treatment of waste water, pollutant, etc. and the hollow carbon in hollow core structure may be used as template material for the synthesis of other spherical material.

Description

Technical field [0001] The invention relates to a hollow carbon and its synthesis method and application. Background technique [0002] Carbon materials have shown good application prospects in catalysis, adsorption, sensing, electrode materials, energy storage, etc., while carbon materials with different pore sizes and different morphologies show different application potentials. In view of this, the current research hotspots of carbon materials Concentrate on two aspects: aperture control and shape control. [0003] Generally, carbon materials are obtained by pyrolyzing and carbonizing organic matter at high temperature. Carbon materials synthesized by this method have poor reproducibility, and are difficult to control in morphology and pore size, which brings inconvenience to application. [0004] At present, a new synthesis technology-template synthesis technology has attracted wide attention of researchers. Many research groups used template technology to synthesize a variet...

Claims

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Application Information

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IPC IPC(8): C01B31/02C04B35/52C04B38/00
Inventor 施治国冯钰锜达世禄
Owner WUHAN UNIV
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