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Modified nano iron oxide particles and application thereof in anaerobic fermentation

A technology of nano-iron oxide and iron oxide particles, which is applied in the field of nano-materials, can solve the problems of low gas production rate and unsatisfactory effect, and achieve the effect of promoting methane production, promoting interaction, and promoting production

Inactive Publication Date: 2019-12-17
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the metabolism of intermediate process products such as organic acids to methane is the bottleneck of efficient anaerobic conversion.
[0004] The application of nanomaterials in the anaerobic digestion process is less researched, and the results are often not satisfactory
Exploring the modification of nano-iron oxide particles and using them in the anaerobic digestion methane production process to overcome the above-mentioned bottleneck is of great significance to the low gas production rate of raw materials in today's large-scale biogas projects and to greatly increasing the anaerobic digestion methane production. significance

Method used

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  • Modified nano iron oxide particles and application thereof in anaerobic fermentation
  • Modified nano iron oxide particles and application thereof in anaerobic fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Preparation of modified nano-iron oxide particles

[0025] FeCl 3 and FeCl 2 Dissolve in a certain amount of distilled water at a molar ratio of 2:1 and heat to 60°C. Under the protection of argon, concentrated ammonia water was slowly added to make the pH of the solution 9 and kept for 2 h. After the reaction, the sample was washed three times with deionized water and ethanol to obtain bare-core magnetic nanoparticles.

[0026] Take a certain amount of nano-Fe 3 o 4 Dissolve the magnetic particles in 100ml of distilled water, and ultrasonically treat them for 15-30 minutes to completely disperse them. Then slowly add 50-70 mg of surface ligand molecule polyethyleneimine into the solution. After stirring for 24-48 hours, the ligand-modified Fe 3 o 4 The nanoparticles are separated from the solution, washed repeatedly with distilled water and methanol, and dried in vacuum to obtain the final magnetic nanoparticles.

Embodiment 2

[0027] The preparation of embodiment 2 modified nano-iron oxide particles

[0028] FeCl 3 and FeCl 2 Dissolve in a certain amount of distilled water at a molar ratio of 2:1 and heat to 60°C. Under the protection of argon, concentrated ammonia water was slowly added to make the pH of the solution 9 and kept for 2 h. After the reaction, the sample was washed three times with deionized water and ethanol to obtain bare-core magnetic nanoparticles.

[0029] Take a certain amount of nano-Fe 3 o 4 Dissolve the magnetic particles in 100ml of distilled water, and ultrasonically treat them for 15-30 minutes to completely disperse them. Then slowly add 60-80 mg of sodium citrate containing surface ligand molecules into the solution. After stirring for 24-36 hours, the ligand-modified Fe 3 o 4 The nanoparticles are separated from the solution, washed repeatedly with distilled water and methanol, and dried in vacuum to obtain the final magnetic nanoparticles.

Embodiment 3

[0030] Embodiment 3 Preparation of modified nano iron oxide particles

[0031] FeCl 3 and FeCl 2 Dissolve in a certain amount of distilled water at a molar ratio of 2:1 and heat to 60°C. Under the protection of argon, concentrated ammonia water was slowly added to make the pH of the solution 9 and kept for 2 h. After the reaction, the sample was washed three times with deionized water and ethanol to obtain bare-core magnetic nanoparticles.

[0032] Take a certain amount of nano-Fe 3 o 4 Dissolve the magnetic particles in 100ml of distilled water, and ultrasonically treat them for 15-25 minutes to completely disperse them. Then slowly add 65-85 mg of thioglycolic acid containing surface ligand molecules into the solution. After stirring for 12-24 hours, the ligand-modified Fe 3 o 4 The nanoparticles are separated from the solution, washed repeatedly with distilled water and methanol, and dried in vacuum to obtain the final magnetic nanoparticles.

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Abstract

The invention discloses modified nano iron oxide particles and application thereof in anaerobic fermentation. The modified nano iron oxide particles are obtained by surface modification of bare core magnetic nano iron oxide particles, and the modified iron oxide particles have different types of charges. A small amount of the modified iron oxide particles are added to an anaerobic system, and thenanoparticles can promote syntrophism of acidogenic bacteria and methanogenic bacteria to further increase electron transfer, promote the conversion of organic acids to methane generation paths, improve the buffering capacity of the system, increase the stability of the system, and further greatly improve the methane yield.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a modified nanometer ferric oxide particle and a preparation method thereof, and the application of the particle in the field of anaerobic fermentation. Background technique [0002] Iron oxide nanoparticles are a new type of magnetic functional materials, which are widely used in many fields such as biology, materials and environment. Nano-iron oxide can be used as gas-sensitive materials, catalysts, transparent pigments, etc. [0003] The anaerobic digestion process is widely used in the disposal of solid waste resources such as wastewater treatment, organic domestic waste, and agricultural, forestry and animal husbandry waste. The advanced point of anaerobic digestion is to convert organic carbon substances into methane, as a sustainable technology to realize energy recovery and utilization. However, the metabolism of intermediate process products such as organic acids to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08C12P5/02H01F1/01H01F41/00B82Y40/00
CPCB82Y40/00C01G49/08C01P2006/42C12P5/023H01F1/0018H01F1/01H01F41/00Y02E50/30
Inventor 奚永兰肖清波叶小梅杜静靳红梅孔祥平朱宁王莉
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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