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Ferromagnetic biochar spheres for purifying water bodies and preparation method and application thereof

A technology for purifying water and biochar, applied in chemical instruments and methods, water pollutants, alkali metal compounds, etc., can solve the problems of unrecoverable biochar balls, secondary pollution, etc., and achieves many adsorption sites and simple production methods. , a wide range of effects

Pending Publication Date: 2019-01-29
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a biochar ball prepared by using biochar and clay, and the removal efficiency of ammonia nitrogen is close to 50%, but the biochar ball cannot be recycled and there is a possibility of secondary pollution

Method used

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  • Ferromagnetic biochar spheres for purifying water bodies and preparation method and application thereof
  • Ferromagnetic biochar spheres for purifying water bodies and preparation method and application thereof
  • Ferromagnetic biochar spheres for purifying water bodies and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Take Enteromorpha biochar as an example:

[0028] Add 100mL of 3mol / L hydrochloric acid to 10g of Enteromorpha biochar, soak for 24h, filter, rinse with deionized water until the pH is neutral, dry in a constant temperature drying oven at 80°C for 10h, and pass through a 100-mesh sieve to obtain the modified Enteromorpha biochar. The scanning electron microscope image of Enteromorpha biochar is figure 1 As shown in (a), the scanning electron microscope image of modified Enteromorpha biochar is as follows figure 1 As shown in (b), after soaking and modifying with hydrochloric acid, the surface of Enteromorpha biochar is rougher and the specific surface area increases. The modified Enteromorpha biochar has more adsorption sites for pollutants and has a stronger ability to remove pollutants.

[0029] Place 0.6g chitosan in 20mL deionized water, and make a chitosan solution with a mass fraction of 3% after being completely dissolved;

[0030] Weighing 0.33g mod...

Embodiment 2

[0036] Example 2 Taking reed biochar as an example:

[0037]Add 150 mL of 3 mol / L hydrochloric acid to 15 g of reed biochar, soak for 24 hours, filter, rinse with deionized water until the pH is neutral, dry in a constant temperature drying oven at 80°C for 10 hours, and pass through a 100-mesh sieve to obtain modified reed biochar. carbon;

[0038] Place 0.4g chitosan in 20mL concentration of 1% acetic acid solution, and after completely dissolving, make a chitosan solution with a mass fraction of 2%;

[0039] Weighing 0.25g modified reed biochar and 0.75g zero-valent iron powder were mixed into the above-mentioned chitosan solution, and 0.75g hollow glass microspheres were added thereto to obtain a mixed solution;

[0040] Then the above mixed solution was dropped into a 4% sodium hydroxide solution through a 50 mL syringe, and after cross-linking for 10 h, it was washed several times with deionized water until the pH was neutral to obtain ferromagnetic biochar spheres.

...

Embodiment 3

[0043] Example 3 Taking pine needle biochar as an example:

[0044] Add 50 mL of 3 mol / L hydrochloric acid to 5 g of pine needle biochar, filter after soaking for 24 hours, rinse with deionized water until the pH is neutral, dry in a constant temperature drying oven at 70°C for 11 hours, and pass through a 100-mesh sieve to obtain the modified pine needle biochar. carbon;

[0045] 0.8g chitosan was placed in 20mL concentration of 1% acetic acid solution, and after being completely dissolved, it was prepared into a chitosan solution with a mass fraction of 4%;

[0046] Weighing 0.75g modified pine needle biochar and 0.25g zero-valent iron powder are mixed into the above-mentioned chitosan solution, and 0.75g hollow glass microspheres are added thereto to obtain a mixed solution;

[0047] Afterwards, the mixed solution was dropped into a 2% sodium hydroxide solution through a 50 mL syringe, and after cross-linking for 12 hours, it was washed several times with deionized water u...

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Abstract

Provided are ferromagnetic biochar spheres for purifying water bodies and a preparation method and application thereof. The ferromagnetic biochar spheres are spheres which are prepared from a chitosansolution, biochar, zero-valent iron powder, hollow glass microspheres and a sodium hydroxide solution, have a particle size of 5-6 mm, and float on the water surface. The preparation method comprisesthe steps: adding the biochar and zero-valent iron powder in the chitosan solution, adding the hollow glass microspheres, and adding the mixture dropwise into the sodium hydroxide solution so as to obtain the ferromagnetic biochar spheres. The ferromagnetic biochar spheres have strong reducibility due to multiple adsorption sites, hexavalent chromium and methylene blue dye in wastewater can be removed simultaneously or separately, and the removal efficiency of the two pollutants reaches 50% or above. Since the prepared ferromagnetic biochar spheres have ferromagnetism and can float on the water surface, recovery of the ferromagnetism is not difficult through an external magnetic field, no secondary pollution to the environment is caused, and the ferromagnetic biochar spheres are an environment-friendly adsorption product; and moreover, the ferromagnetic biochar spheres have wide preparation raw material sources, a simple preparation method, low cost and easy industrialization, and are expected to be an excellent product for purifying water.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and in particular relates to a ferromagnetic biochar sphere for purifying water, a preparation method and application thereof. Background technique [0002] At present, some rivers in my country are seriously polluted by dyes and heavy metals, which destroys the habitat of water bodies. Printing and dyeing wastewater has the characteristics of high COD, complex composition, high alkalinity, high temperature, large chroma, and difficult biochemical degradation. It is one of the most difficult wastewater to treat. Methylene blue is a typical water-soluble cationic dye. It is a heteroatom compound. It is easy to pollute the water body when released into the environment, seriously damage the ecological environment of the water body, endanger aquatic animals, such as carcinogenesis, teratogenicity, etc., and also bring harm to human health. potential hazard. Hexavalent chromium is w...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30C02F101/22
CPCB01J20/02B01J20/041B01J20/10B01J20/103B01J20/20B01J20/24B01J20/28009B01J2220/46B01J2220/4806B01J2220/4825C02F1/281C02F1/286C02F2101/22C02F2101/308
Inventor 田伟君王亮乔凯丽杜昭阳储美乐宋甜甜赵婧龚晓希
Owner OCEAN UNIV OF CHINA
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