Magnetic Fe3O4/biochar adsorbent and application thereof

A biochar and adsorbent technology, applied in the direction of adsorption of water/sewage treatment, water/sludge/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problem of small number and types of functional groups and performance improvement of magnetic biochar No obvious problems affecting the morphology of biochar, etc., to achieve the effect of enriching the functional group structure, reducing the by-product ferric oxide, and improving the removal performance

Active Publication Date: 2021-05-14
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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Problems solved by technology

However, the inventors have found that the performance improvement of magnetic biochar prepared by this traditional method is not obvious, especially for the removal of Cr in water.
The inventors believe that this may be because, on the one hand, the number and types of functional groups on the surface of biochar prepared by traditional pyrolysis are relatively small, and on the other hand, the ferroferric oxide magnetic particles are doped with the by-product ferric oxide, which affects the biological charcoal. Morphology

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  • Magnetic Fe3O4/biochar adsorbent and application thereof
  • Magnetic Fe3O4/biochar adsorbent and application thereof
  • Magnetic Fe3O4/biochar adsorbent and application thereof

Examples

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preparation example Construction

[0039] The preferred biochar preparation process is as follows: place the biomass material in an oxygen-barrier environment, rapidly heat up to 500-600°C at a rate of 20-30°C / min, heat-preserve and carbonize for 60-90min, grind it after natural cooling, and store it in a dry place; Further, the biomass material is placed in a CO2-filled 2 In the sealed pressure device, the pressure is raised so that the CO 2 Transform into a supercritical fluid and immerse the biomass material, then release the pressure, repeat the operation 3 to 5 times, and then soak the biomass material in water for 12 to 24 hours; further, the pressure increase rate is less than the pressure release rate, further, the pressure increase The rate is 0.1-0.5 MPa / min, and the pressure release rate is 2-3 MPa / min; the preferred biomass material is one of rice husk, crushed straw and sawdust.

[0040] The above magnetic Fe 3 o 4 / Application of biochar adsorbent to remove Cr from water. Preferably, the pH v...

Embodiment 1

[0043] A magnetic Fe 3 o 4 / biochar adsorbent, prepared by the following method:

[0044] (1) 0.10g (0.5mmol) FeCl 2 4H 2 O, 0.27g (1mmol) FeCl 3 ·6H 2 O was ultrasonically dissolved in a round bottom flask containing 20 mL of ethylene glycol;

[0045] (2) Disperse 0.3 g of biochar evenly in ethylene glycol with the assistance of ultrasonic waves, and then add 2 mL of 2 mol / L NaOH solution (0.16 g, 4 mmol);

[0046] (3) Place the round-bottomed flask in a microwave oven, open a hole at the top of the microwave oven, introduce a condensing reflux tube above the round-bottomed flask, and keep the continuous condensing reflux operation. The temperature of the condensate is 10 ° C; the frequency of the microwave is 2.45 × 10 9 Hz, the power of microwave is 640W; microwave reaction is 20min;

[0047] (4) After the reaction is completed, cool to room temperature, and the obtained black product is collected by centrifugation, washed 5 times with absolute ethanol, and vacuum-d...

Embodiment 2

[0051] A magnetic Fe 3 o 4 / biochar adsorbent, prepared by the following method:

[0052] (1) 0.10g (0.5mmol) FeCl 2 4H 2 O, 0.27g (0.8mmol) FeCl 3 ·6H 2 O was sonicated in a round bottom flask containing 20 mL of ethylene glycol;

[0053] (2) Disperse 0.25g of biochar evenly in the solution with the help of ultrasonic waves, and then add 2mL of 1.75mmol / L NaOH solution (0.14g, 3.5mmol);

[0054] (3) Place the round-bottomed flask in a microwave oven, open a hole on the top of the microwave oven, and introduce a condensation reflux tube above the round-bottomed flask. During the reaction, there is a continuous condensation and reflux operation. The temperature of the condensate is 10°C. The frequency is 2.0×10 9 Hz, the power of microwave is 500W; microwave reaction is 20min;

[0055] (4) Cool to room temperature after the reaction, the obtained black product is collected by centrifugation, washed 5 times with absolute ethanol, vacuum-dried at 60°C for 12h and sealed ...

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Abstract

The invention relates to the technical field of Cr-containing wastewater treatment, and discloses a magnetic Fe3O4/biochar adsorbent so as to overcome the defects of a magnetic biochar material prepared by an existing traditional pyrolysis method; FeCl3.6H2O and FeCl2.4H2O are dispersed in an organic solvent, biochar and alkali liquor are added, the mixture is mixed and then placed in a microwave environment for a reaction, and after the reaction, a product is washed and dried to obtain the magnetic Fe3O4/biochar adsorbent. According to the magnetic Fe3O4/biochar adsorbent disclosed by the invention, a specific microwave environment is introduced into magnetic particles prepared by a chemical coprecipitation method, so that the magnetic particles are rapidly generated and loaded on the surface of biochar in situ, the generation of a byproduct ferric oxide is avoided or reduced, secondary modification of the biochar through the magnetic particles and microwaves is realized, the functional group structure on the surface of the biochar is enriched, and the removal performance of Cr in a water body is obviously improved.

Description

technical field [0001] The invention relates to the technical field of Cr-containing wastewater treatment, in particular to a magnetic Fe 3 o 4 / Biochar adsorbent and its application. Background technique [0002] Chromium pollution in water is an environmental problem that needs to be solved urgently. Chromium exists in two forms: trivalent (Cr(III)) and hexavalent (Cr(III)) in water. The toxicity of Cr(VI) is 300 times that of Cr(III), and Cr(VI) is difficult to degrade and easy to accumulate in the body. It is a recognized strong carcinogen. It is necessary to carry out certain treatment to remove Cr(VI) in industrial wastewater before discharge. At present, the methods for treating chromium-containing wastewater mainly include chemical precipitation, ion exchange, membrane filtration and adsorption. Adsorption method has the advantages of high treatment efficiency, simple operation, and easy access to adsorbents. It is a common method for treating chromium-containin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/06B01J20/20B01J20/28009B01J20/3085C02F1/288C02F2101/22Y02W10/40
Inventor 汪玉瑛吕豪豪刘玉学何莉莉杨生茂
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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