Method for preparing modified biochar through ferrate oxidation under alkaline condition

A biochar, potassium ferrate technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of limited surface adsorption sites, small weight of biochar, limited removal effect, etc., to solve difficult degradation and adsorption performance. Improve and improve the effect of utilization efficiency

Inactive Publication Date: 2016-02-03
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As an adsorption material, biochar has a large specific surface area and adsorption capacity, but its surface adsorption sites are limited, so its adsorption performance and stability are greatly limited in order to improve the performance of biochar; in addition, although biochar is a However, due to the small weight of biochar, biochar often floats on the surface of water when it is applied to the adsorption of water pollutants, and it is difficult to fully contact with the sedimentary interface of water or rivers, which limits its removal of pollutants. Effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing biochar, the specific steps are as follows:

[0042] 1) Crush the palm shell into powder with a particle size of 50 mesh sieve; heat the powder at a heating rate of 5°C / min to 300°C for 2 hours; then continue to heat up to 400°C and hold for 5 hours to obtain biochar ; The entire heating and heat preservation process is carried out in a nitrogen atmosphere; the surface area of ​​the resulting biochar is 50.35 ~ 130.34m 2 / g, the pore volume is 0.0592~0.1522cm 3 / g;

[0043] 2) Disperse the biochar into the alkaline solution, mix and infiltrate at 0-20°C for 40 minutes; the alkaline solution is 2M sodium hydroxide and potassium hydroxide solution, and the dosage ratio of the alkaline solution to the biochar is 50ml: 20g ;

[0044] 3) Add a strong oxidant, potassium ferrate, to the above mixture, stir well, ultrasonicate for 10 minutes, continue stirring for 3 hours, slowly raise the temperature to 50°C and continue stirring for 1 hour; the dosag...

Embodiment 2

[0049] A method for preparing biochar, the specific steps are as follows:

[0050] 1) Crush the cow dung into powder with a particle size of 30-120 mesh sieve; after heating the powder, heat it up to 250°C at a heating rate of 4°C / min for 2.5 hours; then continue to heat up to 300°C and hold it for 12 hours. The biochar is obtained; the whole heating and heat preservation process is carried out in a nitrogen atmosphere; the surface area of ​​the obtained biochar is 50.35~130.34m 2 / g, the pore volume is 0.0592~0.1522cm 3 / g;

[0051] 2) Disperse 20g of biochar into 50mL of 2M sodium hydroxide solution, mix and infiltrate at 20°C for 30min;

[0052] 3) Add 7.08g of strong oxidant potassium ferrate to the above mixture, stir well, then ultrasonicate for 5min, continue stirring for 3h, slowly raise the temperature to 70°C and continue stirring for 1h;

[0053] The purpose of this stage is to use the oxidation properties of potassium ferrate to enrich the functional groups on t...

Embodiment 3

[0060] A method for preparing biochar, the specific steps are as follows:

[0061] 1) Crush camphor tree branches into powder with a particle size of 30-120 mesh sieves; after heat treatment of the powder, heat up to 350°C at a heating rate of 5°C / min for 2 hours; then continue to heat up to 500°C and hold for 10 hours to obtain Biochar; the whole heating and heat preservation process is carried out in nitrogen atmosphere; the surface area of ​​the obtained biochar is 50.35~130.34m 2 / g, the pore volume is 0.0592~0.1522cm 3 / g;

[0062] 2) Disperse the biochar into the alkaline solution, mix and infiltrate at 0°C for 1 hour; the alkaline solution is 2.2M potassium hydroxide solution, and the dosage ratio of the alkaline solution to the biochar is 45ml:18g.

[0063] 3) Add a strong oxidant, potassium ferrate, to the above mixture, stir well, ultrasonicate for 10 minutes, continue stirring for 4 hours, slowly raise the temperature to 10°C and continue stirring for 24 hours; th...

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Abstract

The invention discloses a method for preparing modified biochar through ferrate oxidation under an alkaline condition. The method comprises the steps of dispersing and mixing biochar in an alkaline solution; adding a strong oxidant-potassium ferrate, carrying out ultrasonic processing after uniformly stirring the mixture, continuously stirring, then slowly rising the temperature to be 10 to 70 DEG C and continuously stirring; then adding a proper amount of water in the mixture, standing, removing upper-layer liquid, then cleanly washing by water, drying, and obtaining the modified biochar. The adsorption performance of the modified biochar provided by the invention on heavy metal is greatly increased; the biochar is oxidized by adopting the alkaline condition, modification is carried out by utilizing a chemical method, the content of surface functional groups of the biochar is changed, and equivalent stability is obtained. A preparation method provided by the invention is simple, the condition is mild, the method can be easily used for industrial production, additional environment hazards cannot be caused, the utilization efficiency of biomass resources is increased, the problem that agricultural and forestry biomass wastes are difficult to degrade and reutilize is solved, and the social significance and the economic value are extremely profound.

Description

Technical field [0001] The present invention involves the preparation of biological carbon adsorption materials and the field of environmental pollution. It specifically involves a green modified biological carbon material and its preparation method. Background technique [0002] Biological charcoal has a large comparison area and adsorption capacity as an adsorption material, but the surface absorbing point is limited, so its adsorption properties and stability are greatly limited to improve the performance of biological charcoal;Good adsorption materials, but due to the small weight of biochetic charcoal, biochams often float on the surface of the water body when it is used in water pollutants.Effect. [0003] A large number of documents have been reported that FE (Ⅲ) can reduce the effectiveness of arsenic and cymbals in the soil. If some studies have found that iron (Ⅲ) hydroxyxide, iron (Ⅲ) hydroxideSettlement or surface adsorption.In recent years, potassium high -speed rail...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30
Inventor 陈志良袁志辉刘敏超蒋晓璐戴玉王欣
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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