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a magnetic fe 3 o 4 /Biochar adsorbents and applications

A biochar and adsorbent technology, which is applied in the fields of adsorption water/sewage treatment, water/sludge/sewage treatment, alkali metal oxides/hydroxides, etc. It is not obvious and affects the morphology of biochar, and achieves the effect of enriching the structure of functional groups, reducing the by-product ferric oxide, and improving the removal performance.

Active Publication Date: 2022-07-08
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • a magnetic fe <sub>3</sub> o <sub>4</sub> /Biochar adsorbents and applications
  • a magnetic fe <sub>3</sub> o <sub>4</sub> /Biochar adsorbents and applications
  • a magnetic fe <sub>3</sub> o <sub>4</sub> /Biochar adsorbents and applications

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preparation example Construction

[0039] The preferred preparation process of biochar is as follows: the biomass material is placed in an oxygen-isolated environment, rapidly heated to 500-600°C at a rate of 20-30°C / min, thermally carbonized for 60-90 minutes, ground after natural cooling, and dried for storage; Further, the biomass material is placed in a CO 2 In a sealed pressure device, increasing the pressure makes the CO 2 Transform into supercritical fluid and immerse the biomass material, then release the pressure, repeat the operation for 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, and further, the pressure increase The rate is 0.1-0.5MPa / min, and the pressure relief rate is 2-3MPa / min; preferably the biomass material is one of rice husk, broken straw and wood chips.

[0040] The above magnetic Fe 3 O 4 / Application of biochar adsorbent in the removal of Cr from water. Preferably, the pH va...

Embodiment 1

[0043] A magnetic Fe 3 O 4 / Biochar adsorbent, prepared by the following methods:

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

[0045] (2) 0.3g of biochar was uniformly dispersed in ethylene glycol under the aid of ultrasonic waves, and then 2mL (0.16g, 4mmol) of 2mol / L NaOH solution was added;

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

[0047] (4) After the reaction was completed, it was cooled to room temperature, and the obtained black product was collected by centrifugation, washed with a...

Embodiment 2

[0051] A magnetic Fe 3 O 4 / Biochar adsorbent, prepared by the following methods:

[0052] (1) 0.10g (0.5mmol) FeCl 2 ·4H 2 O, 0.27g (0.8mmol) FeCl 3 ·6H 2 o Dissolved by sonication in a round-bottomed flask containing 20 mL of ethylene glycol;

[0053] (2) 0.25g of biochar was evenly dispersed in the solution under the aid of ultrasonic waves, and then 2mL (0.14g, 3.5mmol) of 1.75mmol / L NaOH solution was added;

[0054] (3) the round-bottomed flask is placed in a microwave oven, a hole is opened at the top of the microwave oven, a condensation reflux tube is introduced above the round-bottomed flask, and there is a continuous condensation reflux operation during the reaction, and the temperature of the condensate is 10 ℃, and the microwave The frequency is 2.0×10 9 Hz, the power of the microwave is 500W; the microwave reaction is 20min;

[0055] (4) After the reaction was completed, it was cooled to room temperature, and the obtained black product was collected by ce...

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Abstract

The invention relates to the technical field of treatment of Cr-containing wastewater, and discloses a magnetic Fe 3 O 4 / biochar adsorbent, the FeCl 3 ·6H 2 O, FeCl 2 ·4H 2 O is dispersed in an organic solvent, biochar and lye are added, mixed and then placed in a microwave environment to react. After the reaction, the product is washed and dried to obtain magnetic Fe 3 O 4 / Biochar adsorbent. Magnetic Fe of the present invention 3 O 4 A specific microwave environment is introduced into the preparation of magnetic particles by chemical co-precipitation as a biochar adsorbent, so that the magnetic particles are rapidly generated and loaded on the biochar surface in situ, which not only avoids or reduces the production of by-product ferric oxide, but also achieves The secondary modification of biochar by magnetic particles and microwaves enriches the functional group structure on the surface of biochar, and the removal performance of Cr in water is significantly improved.

Description

technical field [0001] The invention relates to the technical field of treatment of Cr-containing wastewater, in particular to a magnetic Fe 3 O 4 / Biochar adsorbents and applications. 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 refractory to degradation 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 of treating chromium-containing wastewater mainly include chemical precipitation method, ion exchange method, membrane filtration method and adsorption method. Adsorption method has the advantages of high treatment efficiency, simple operation and easy availability of adsorbents. It is a common...

Claims

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Application Information

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Patent Type & Authority Patents(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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