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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  • 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 i

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

Example Embodiment

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

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

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

[0030] Weigh 0.33g modified Enteromorpha biochar and 0.67g zero-valent i...

Example Embodiment

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

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

[0038] Put 0.4 g of chitosan in 20 mL of 1% acetic acid solution, and make a 2% mass fraction chitosan solution after it is completely dissolved;

[0039] Weigh 0.25g of modified reed biochar and 0.75g of zero-valent iron powder and mix them into the chitosan solution, and add 0.75g of hollow glass microspheres to it to obtain a mixed solution;

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

[0041] The following is the application of the fe...

Example Embodiment

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

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

[0045] Put 0.8 g of chitosan in 20 mL of 1% acetic acid solution, and prepare a 4% chitosan solution after being completely dissolved;

[0046] Weigh 0.75g of modified pine needle biochar and 0.25g of zero-valent iron powder into the chitosan solution, and add 0.75g of hollow glass microspheres to it to obtain a mixed solution;

[0047] After that, the mixed solution was dropped into a 2% sodium hydroxide solution with a mass fraction through a 50 mL syringe, and after cross-linking for 12 h, it was rinsed with deionized water several times until the pH was neutral to obtain a ferromagnetic biochar ball.

[0048] The following is the application of t...

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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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