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Surface-modified biochar adsorption material and preparation method and application thereof

An adsorption material and surface modification technology, which is applied in the direction of radioactive pollutants, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of high price and complicated operation steps, and improve the pore structure and specific surface area, enhance the The effect of adsorption and removal capacity

Pending Publication Date: 2019-11-29
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current modification method mainly uses chemical methods to graft polymer functional groups on the surface of biochar. This method introduces polymer chemical materials, which is expensive and complicated.

Method used

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  • Surface-modified biochar adsorption material and preparation method and application thereof
  • Surface-modified biochar adsorption material and preparation method and application thereof
  • Surface-modified biochar adsorption material and preparation method and application thereof

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Effect test

preparation example Construction

[0029] refer to figure 1 , the preparation method of the above-mentioned surface-modified biochar adsorption material comprises steps:

[0030] S10, providing biomass material, performing high-temperature anaerobic pyrolysis treatment on the biomass material to prepare biochar.

[0031] S20. Place the biochar in the reaction chamber of low-temperature plasma, evacuate until the pressure in the chamber is stable, introduce a reaction gas containing ammonia, and modify the surface of the biochar by low-temperature plasma discharge to prepare A biochar with amino groups modified on the surface was obtained.

[0032] like figure 2 As shown, the step S10 may specifically include:

[0033] S11, providing biomass material and performing pretreatment on drying, pulverizing and sieving in sequence.

[0034] In a preferred scheme, the biomass material is dried at a temperature of 60° C. to 80° C. for 24 hours to 48 hours to remove excess water in the biomass material, and then crus...

Embodiment 1

[0070] (1) Preparing bamboo powder biochar material: drying, pulverizing and sieving the waste bamboo and wood in sequence. The pretreated material was placed in a tube furnace, cracked at a temperature of 600°C for 2 hours in a nitrogen atmosphere, the heating rate was 10°C / min, and cooled to room temperature under the protection of nitrogen to obtain a bamboo charcoal biochar material. Then the bamboo charcoal biochar was fully rinsed with distilled water, then dried at 60°C for 24 hours, and then dried for use.

[0071] (2) Plasma amination modification of the surface of biochar:

[0072] Place the bamboo charcoal biochar material obtained above in a low-temperature plasma treatment reaction chamber, feed high-purity argon gas, adjust the flow rate to a vacuum degree of 20.0Pa in the reaction chamber, and perform radio frequency low-temperature plasma discharge after 5 minutes of stabilization, to treat the surface of the material Carry out pretreatment, the treatment time...

Embodiment 2

[0086] (1) Preparation of wheat straw biochar material: dry, crush and sieve wheat straw in sequence. The pretreated material was placed in a tube furnace, cracked at a temperature of 500 °C for 3 h in a nitrogen atmosphere, the heating rate was 15 °C / min, and cooled to room temperature under the protection of nitrogen to obtain wheat straw biochar materials. Then, the wheat straw biochar was fully rinsed with distilled water, then dried at 70°C for 15 hours, and then dried for use.

[0087] (2) Plasma amination modification of the surface of biochar:

[0088] Place the above-obtained wheat straw biochar material in a low-temperature plasma treatment reaction chamber, pass high-purity argon gas, adjust the flow rate to a vacuum degree of 50.0 Pa in the reaction chamber, and conduct radio frequency low-temperature plasma discharge after 5 minutes of stabilization. The surface is pre-treated, the treatment time is 10min, and the discharge power is 100W.

[0089] After the pret...

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Abstract

The invention discloses a surface-modified biochar adsorption material. The biochar adsorption material is biochar of which the surface is modified with amino. The preparation method comprises the following steps: S10, providing a biomass material, and carrying out high-temperature anaerobic cracking treatment on the biomass material to prepare biochar; and S20, placing the biochar in a reaction cavity of low-temperature plasma, vacuumizing until the air pressure in the cavity is stable, introducing a reaction gas containing ammonia gas, and performing surface modification on the biochar through low-temperature plasma discharge to prepare the biochar with the modified amino on the surface. The biochar adsorption material provided by the invention is applied to treatment of water body pollution, and pollutants such as heavy metal ions and radionuclide ions in water bodies can be effectively adsorbed and removed.

Description

technical field [0001] The invention belongs to the technical field of water body pollution control, and in particular relates to a surface-modified biochar adsorption material and a preparation method and application thereof. Background technique [0002] With the rapid development of the economy, various pollutants such as heavy metal ions (such as chromium, cadmium, copper, mercury, Nickel, zinc, etc.), radionuclide ions (such as uranium), etc., entering the water environment will cause a lot of pollution. Water pollutants have different characteristics and toxicity due to different types, which can significantly increase the incidence of cancer and other malignant diseases, and pose a serious threat to people's health and the environment. For example, in the 1960s in Japan, Minamata disease and itai-itai disease were caused by mercury-containing wastewater and cadmium-containing wastewater polluting water bodies; while human beings drink water polluted by organic substa...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/00C02F101/20
CPCB01J20/20B01J20/0259C02F1/283B01J2220/4825B01J2220/4875B01J2220/485C02F2101/20C02F2101/006
Inventor 胡锐田兴友陈林肖江陈光才王天慧邵雪莲
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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