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Nano-iron-loaded biochar, preparation method of nano-iron-loaded biochar, and application of nano-iron-loaded biochar in dark fermentation hydrogen production process

A biochar and dark fermentation technology, which is applied to nano iron-supported biochar and its preparation and application in the dark fermentation hydrogen production process, can solve the problems of low microbial concentration, low hydrogen yield, long fermentation lag period and the like

Inactive Publication Date: 2018-03-30
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a preparation method of nano-iron-supported biochar, and use it in the dark fermentation hydrogen production process to solve the problems of low microbial concentration, weak hydrogenase activity, low hydrogen production rate and fermentation problems in the fermentation hydrogen production system. Long lag period and other issues

Method used

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preparation example Construction

[0062] The preparation method of described iron-loaded biochar, concrete steps are as follows:

[0063] A. Add 40~80g FeCl 2 4H 2 O particles were dissolved in deionized water, and the volume was adjusted to 200ml with deionized water to obtain FeCl with a concentration of 128-256g / L 2 solution.

[0064] B. Dissolve 25-75g of soluble starch in 100-300ml of deionized water, and stir at 70-85°C for 15-30 minutes to obtain a uniform soluble starch solution with a concentration of 85-500g / L.

[0065] C. Mix the above ferrous solution and soluble starch solution at a volume ratio of 1:1-1.5, and stir them at 70-85° C. for 15-30 minutes to obtain a light blue solution.

[0066] D. Slowly add NaOH solution to the above light blue solution at 70-80°C until the reactant is alkaline (pH=10-12) and stir for 20-30min. At this time, the solution changes from light blue to yellow.

[0067] E. Stir the above yellow solution at 70-80°C and add H with a concentration of 0.7-1.5mol / L dropwi...

Embodiment 1

[0083] a. 45g FeCl 2 4H 2 O particles were dissolved in deionized water, and the volume was adjusted to 200ml with deionized water to obtain a concentration of 144g / L FeCl 2 solution.

[0084] b. Dissolve 50 g of soluble starch in 200 ml of deionized water, and stir at 80° C. for 15 minutes to obtain a uniform soluble starch solution with a concentration of 250 g / L.

[0085] c. Stir the above ferrous solution and soluble starch solution at a ratio of 1:1 at 80° C. for 30 min to obtain a light blue solution.

[0086] d. Constantly stir the above light blue solution in a water bath temperature control system (80° C.), slowly add 100 ml NaOH solution and stir for 25 minutes to adjust its pH to 11 to obtain a yellow liquid.

[0087] e. Stir the above yellow solution at 80°C and add H at a concentration of 1 mol / L dropwise. 2 o 2 Solution 45~50ml, stirring reaction for 1.5h to get black Fe 3 o 4 / Soluble starch suspension.

[0088] f. The above black Fe 3 o 4 / The solubl...

Embodiment 2

[0091] Others are the same as embodiment 1, the difference is:

[0092] a. 79g FeCl 2 4H 2 O particles were dissolved in deionized water, and the volume was adjusted to 200ml with deionized water to obtain FeCl with a concentration of 252g / L 2 solution.

[0093] b. Dissolve 80 g of soluble starch in 250 ml of deionized water, and stir at 80° C. for 20 minutes to obtain a uniform soluble starch solution with a concentration of 320 g / L.

[0094] c. Stir and mix the above ferrous solution and soluble starch solution at a ratio of 1:1.2 at 85° C. for 20 minutes to obtain a blue solution.

[0095] d. Stir the above light blue solution continuously in a water bath temperature control system (80° C.), slowly add NaOH solution to pH=12 and stir for 20 minutes to obtain a yellow liquid.

[0096] e. Stir the above yellow solution at 80°C and add H at a concentration of 1 mol / L dropwise 2 o 2 Solution 65 ~ 70ml, stirring reaction for 2h to get black Fe 3 o 4 / Soluble starch suspe...

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Abstract

The invention relates to nano-iron-loaded biochar, a preparation method of the nano-iron-loaded biochar, and an application of the nano-iron-loaded biochar in a dark fermentation hydrogen production process. Ferrite and soluble starch are taken as raw materials which are subjected to reaction under proper conditions and are dried and charred to obtain the nano-iron-loaded biochar, wherein the maincomponent of the nano-iron-loaded biochar is Fe2O3 / C, and the particle diameter range of the nano-iron-loaded biochar is 2-150nm. The biochar is of an amorphous structure, and Fe2O3 is of a mesoporous structure. By adding the iron-loaded biochar to an anaerobic fermentation system, a synergistic strengthening effect of iron and biochar in the dark fermentation hydrogen production process is realized, so that the hydrogen yield and the process stability are improved. Fe2O3 can not only release iron ions to enhance the activity of fermentative hydrogen producing bacterium hydrogenase but also increase the transfer rate of electrons; and furthermore, the biochar in nano-particles can enrich microorganisms, improve the concentration of hydrogen producing bacteria, buffer acid accumulation andrelieve ammonia inhibition.

Description

technical field [0001] The patent of the present invention relates to an iron / bio-char composite material, in particular to a nano-iron-supported bio-char and its preparation and application in the hydrogen production process of dark fermentation. Background technique [0002] With the development of economy and society, the excessive exploitation and utilization of disposable resources such as coal, oil, and natural gas have led to increasing energy crises and environmental risks, which have attracted the attention of countries all over the world. Hydrogen, as a clean and renewable ideal fuel, is considered to be the most attractive alternative energy source. At present, domestic and foreign hydrogen production technologies are mainly based on physical chemical methods and biological methods. Hydrogen production by physical and chemical methods mainly includes fossil fuel cracking, electrolysis of water, solar photolysis and other technologies. These technologies generall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P3/00C01B32/05C01G49/06
CPCC01G49/06C01P2004/62C01P2004/64C01P2004/80C01P2006/12C01P2006/17C12P3/00
Inventor 张记市臧立华范传芳
Owner QILU UNIV OF TECH
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