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Preparation of sic/iron nitride nanocomposites from agricultural waste and method thereof

A technology of nanocomposite materials and agricultural waste, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of increasing silicon carbide production costs, increasing energy consumption, and high equipment requirements. To achieve the effect of novel material structure, low cost and wide application

Inactive Publication Date: 2011-12-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature in the general silicon carbide synthesis method, the requirements for equipment are high, and the energy loss is increased, thereby increasing the production cost of silicon carbide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: Take rice husk as raw material

[0028] 1) Fully pulverize 100 g of rice husk and put it into 400 o Calcined in the C furnace for 8 h in isolation from the air, and the main component was SiO 2 and silicon carbon powder of C;

[0029] 2) The obtained silicon carbon powder is fully mixed with 10 g metal magnesium powder, put into the furnace, and under the protection of high-purity nitrogen, 500 o C calcined for 12 h;

[0030] 3) Add the product of step 2) into 0.05 M hydrochloric acid solution and soak for 4 h; the product is centrifuged, washed with water, and dried in solid phase to obtain porous silicon carbide powder;

[0031] 4) Put 5 g of porous SiC powder in 20 mL of 1.0 mol / L ferric nitrate solution, 60 o C dried and placed in muffle furnace, 450 o C was calcined for 2 hours and then reduced by introducing nitrogen / hydrogen for 60 minutes; after the end, the furnace temperature was maintained, and the ammonia gas was quickly cut in for 60 minu...

Embodiment 2

[0032] Embodiment 2: Take rice straw as raw material

[0033] 1) Fully pulverize 100 g of rice straw and put it into 1200 o Calcined in furnace C for 0.5 h under the protection of high-purity nitrogen to obtain SiO 2 and silicon carbon powder of C;

[0034] 2) Fully mix the obtained silicon carbon powder with 2 g of metal aluminum powder, put it into the furnace, and isolate the air for 800 o C calcined for 0.5 h;

[0035] 3) Add the product of step 2) into 2 M hydrochloric acid solution and soak for 0.5 h; the product is centrifuged, washed with water, and dried in solid phase to obtain porous silicon carbide powder;

[0036] 4) Put 5 g of porous SiC powder in 100 mL of 0.05 mol / L ferric nitrate solution, 150 o C dried and placed in a muffle furnace, 750 o After calcination of C for 0.5 h, introduce nitrogen / hydrogen gas for reduction for 15 min; after the end, maintain the furnace temperature, quickly cut into ammonia gas for 10 min; take it out after natural cooling in n...

Embodiment 3

[0037] Embodiment 3: Taking wheat bran as raw material

[0038] 1) Fully pulverize 100 g of wheat bran and soak in 1 L of 25% concentrated sulfuric acid for 24 h to obtain SiO 2 and silicon carbon powder of C;

[0039] 2) The obtained silicon carbon powder is fully mixed with 5 g metal magnesium powder, put into the furnace, and under the protection of high-purity nitrogen gas, 700 o C calcined for 3 h;

[0040] 3) Add the product of step 2) into 0.2 M hydrochloric acid solution and soak for 2 h; the product is centrifuged, washed with water, and dried in solid phase to obtain porous silicon carbide powder;

[0041] 4) Put 5 g of porous SiC powder in 30 mL of 0.1 mol / L ferric nitrate solution, 70 o C dried and placed in muffle furnace, 550 o After calcination of C for 0.6 h, nitrogen / hydrogen gas was introduced to reduce for 25 min; after the end, the furnace temperature was maintained, and ammonia gas was quickly cut in for 20 min; after natural cooling in nitrogen flow, ...

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PUM

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Abstract

The invention discloses a SiC / iron nitride nano composite material made from agricultural waste and a preparation method thereof. The SiC / iron nitride nano composite material made from agricultural waste comprises a core layer and a coating layer, wherein, the core layer comprises SiC powder, and the coating layer comprises iron nitride nanoparticles. The preparation method comprises following steps: first, processing the agricultural waste with pyrolysis or acid or alkali processing into silicon carbon powder having SiO2 and carbon as main composition, then processing the silicon carbon powder with thermite reaction or high-temperature reaction to obtain SiC, finally, coating a layer of iron nitride nanoparticles on the product with nitridation reaction to obtain the SiC / iron nitride nano composite material. The SiC / iron nitride nano composite material is porous and nano-sized structure, has high specific surface area and high electromagnetic loss property, and has a potential application in the fields of processing difficultly degraded effluent, absorbing materials and the like. The method disclosed in the invention has the advantages of low cost, simple technology, novel material structure, and wide potential application, and has huge application value.

Description

technical field [0001] The invention relates to a compound preparation method, in particular to a SiC / iron nitride nanocomposite material prepared from agricultural waste and a method thereof. Background technique [0002] Agricultural waste refers to the general term for waste generated in the process of agricultural production and agricultural product processing, mainly including fruit shells and cores, straw, rice husks, corn cobs, branches and leaves, and weeds. Because agricultural waste has the characteristics of huge quantity, renewable, short regeneration cycle, biodegradable, rich in carbon and silicon elements, and low utilization level. The harmless and resourceful utilization of agricultural waste is one of the hotspots and difficulties of current research. [0003] Silicon carbide (SiC) is an important inorganic material, which has the advantages of high strength, high modulus, high temperature resistance, corrosion resistance, oxidation resistance, and stable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/36C01B21/06B82Y30/00B82Y40/00
Inventor 陈雪刚叶瑛张奥博刘舒婷邵苏东朱旭恒戴凌青张海燕
Owner ZHEJIANG UNIV
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