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Cobalt-doped magnetic carbon and preparation method and application thereof in anaerobic digestion

A magnetic carbon and magnetic technology, applied in the direction of inorganic chemistry, carbon compounds, chemical instruments and methods, etc., can solve the problems that anaerobic microorganisms provide metalloenzymes and metal elements, cannot further improve microbial activity, and the cost of nano-titanium dioxide preparation is high. Recycling and sludge reduction treatment, realizing sludge reduction treatment, and realizing the effect of reuse

Active Publication Date: 2019-04-16
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is used as a raw material for the preparation of nano-titanium dioxide, which has a high cost and cannot provide anaerobic microorganisms with the necessary metal elements for metalloenzyme synthesis, and cannot further improve microbial activity.
Moreover, the specific surface area of ​​nano-titanium dioxide is small, there is no large amount of pore structure, and the microbial attachment rate is low.

Method used

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  • Cobalt-doped magnetic carbon and preparation method and application thereof in anaerobic digestion
  • Cobalt-doped magnetic carbon and preparation method and application thereof in anaerobic digestion
  • Cobalt-doped magnetic carbon and preparation method and application thereof in anaerobic digestion

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preparation example Construction

[0065] The preparation method of described cobalt-doped magnetic carbon, concrete steps are as follows:

[0066] A. 5 ~ 6.64g Co (NO 3 ) 2 ·6H 2 O and 7~9.44g Fe(NO 3 ) 3 9H 2 O is dissolved in 200-400ml deionized water to obtain a mixed solution of iron and cobalt; at this time, the solution Co(NO 3 ) 2 The concentration is 12.5~33.2g / L, Fe(NO 3 ) 3 The concentration is 17.5-47.2g / L.

[0067] B. Dissolve 12.5-33.2g of NaOH into 50-150ml of deionized water to obtain a lye with a pH of 9-12. At this time, the NaOH concentration is 46.72-258g / L.

[0068] C. Add 24.6 to 99 g of activated carbon powder into the iron-cobalt mixture described in step A, and stir magnetically for 30 minutes to fully contact the iron ions and cobalt ions with the surface of the activated carbon to obtain the iron-cobalt-carbon mixture.

[0069] D. After heating the mixed solution in an oil bath in the condensing reflux reactor to boiling, quickly pour 50-150ml of NaOH solution and stir evenl...

Embodiment 1

[0079] A. Add 5.82g Co(NO 3 ) 2 ·6H 2 O and 7.76g Fe(NO 3 ) 3 9H 2 O was dissolved in 300ml deionized water to obtain a mixed solution of iron and cobalt. At this point, the Co(NO 3 ) 2 Concentration is 19.4g / L, Fe(NO 3 ) 3 The concentration is 25.8g / L.

[0080] B. Dissolve 6.8g NaOH in 100ml deionized water to obtain a lye with pH=9-12, and the NaOH concentration is 68g / L at this time.

[0081] C. Add 48g of activated carbon powder into the iron-cobalt mixed solution described in step A, and stir magnetically for 30 minutes to fully contact the iron ions and cobalt ions with the surface of the activated carbon to obtain the iron-cobalt-carbon mixed solution.

[0082] D. After the mixture is heated to boiling in an oil bath in the condensing reflux reactor, 100ml NaOH solution is quickly added and stirred evenly with a glass rod, and the reflux reaction temperature is kept at 110°C, and the reaction is kept for 4 hours to complete the reaction.

[0083] E. Dry the m...

Embodiment 2

[0087] A. Add 5g Co(NO 3 ) 2 ·6H 2 O and 7g Fe(NO 3 ) 3 9H 2 O is dissolved in 400ml deionized water to obtain a mixed solution of iron and cobalt. At this time, Co(NO 3 ) 2 Concentration is 12.5g / L, Fe(NO 3 ) 3 The concentration is 17.5g / L.

[0088] B. Dissolve 10.2g NaOH in 75ml deionized water to obtain a lye with pH=9-12, at this time, the concentration of NaOH is 46.72g / L.

[0089] C. Add 99g of activated carbon powder into the iron-cobalt mixed solution described in step A, and stir magnetically for 30 minutes to make the iron ions and cobalt ions fully contact the surface of the activated carbon to obtain the iron-cobalt-carbon mixed solution.

[0090] D. After the mixture is heated to boiling in an oil bath in the condensing reflux reactor, pour 75ml of NaOH solution into it quickly and stir evenly with a glass rod. And keep the reflux reaction temperature at 120°C and the reaction time for 3 hours to make the reaction complete.

[0091] E. Dry the mixed sol...

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Abstract

The invention relates to cobalt-doped magnetic carbon and a preparation method and application thereof in hydrogen and methane production through anaerobic fermentation. According to the preparation method, a carbon material is utilized to load a magnetic compound containing iron and cobalt elements to prepare cobalt-doped magnetic carbon, and the magnetic carbon contains substances such as CoFe2O4, Fe2O3, FeFe2O4 and the like. when the cobalt-doped magnetic carbon is applied to the hydrogen and methane production process through anaerobic digestion, a large specific surface area and a developed pore structure of the cobalt-doped magnetic carbon can be utilized to enrich anaerobic microorganisms; meanwhile, the cobalt-doped magnetic carbon is rich in trace elements, so that the biologicalactivity and the growth metabolism of microorganisms are promoted, and the hydrogen and methane production process is completed in an anaerobic reactor. In addition, CoFe2O4 and FeFe2O4 are magnetic substances, after the anaerobic digestion process is finished, the CoFe2O4 and FeFeFe2O4 can be efficiently separated and recycled from sludge by utilizing a magnetic field, so that materials can be used repeatedly.

Description

technical field [0001] The invention relates to the field of materials and clean energy production, in particular to a cobalt-doped magnetic carbon and its preparation and application in the process of anaerobic digestion for hydrogen and methane production. Background technique [0002] The world is facing an energy crisis due to growing energy demand and dwindling fossil fuel supplies. At the same time, a large amount of organic waste generated by human activities has adverse effects on the environment and human health. As a technology with hydrogen and methane as by-products, anaerobic biological treatment can solve the environmental and energy problems faced by our country while realizing the resource utilization of organic waste, and can effectively promote a virtuous ecological cycle and social sustainability develop. Different from conventional anaerobic biological treatment that mainly produces methane, anaerobic digestion produces hydrogen and produces methanogene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/354C02F11/00C02F11/04
CPCC01B32/354C02F11/00C02F11/04Y02E50/30
Inventor 张记市臧立华范传芳
Owner QILU UNIV OF TECH
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