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Magnetic biochar for rapidly removing methylene blue and preparation method and application thereof

A biochar and magnetic technology, applied in chemical instruments and methods, water pollutants, alkali metal compounds, etc., can solve the problems of unfavorable cost control, increased production cost, and many process steps, and achieve cost control and environmental protection , the effect of fewer process steps

Pending Publication Date: 2019-04-09
广州润方环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yi etc. [1] Magnetic biochar with nano-nickel-iron as the magnetic medium was prepared by liquid phase reduction method. The magnetic biochar has an efficient removal effect on BDE209, but this method needs to be pyrolyzed first to prepare biochar, and at the same time, toxic and expensive reagents are required. (such as: sodium borohydride, etc.), shang, etc. [2] The preparation of magnetic biochar by liquid-phase co-precipitation method also requires the preparation of biochar by pyrolysis first, and the use of additional reagents such as sodium hydroxide. It can be seen that the above-mentioned method for preparing magnetic biochar is relatively complicated, and the process steps involved more, and need to use a large amount of toxic or expensive reagents, which is not conducive to cost control, but also has an impact on the environment. In recent years, the impregnation-pyrolysis method can complete magnetization and pyrolysis in one step, with fewer steps , the process is simple, without the use of toxic and harmful reagents, and the advantages of stable combination of magnetic particles and biochar matrix are favored by researchers. CN105536703A discloses a preparation method for one-step synthesis of magnetic biochar, which uses biomass raw materials and contains Fe 2+ and Fe 3+ In the ferric salt solution, add NaOH to adjust the pH value and then perform pyrolysis to obtain magnetic biochar. CN104258823A discloses a modified magnetic biochar adsorption material and its application, wherein the preparation method of magnetic biochar is disclosed as follows: FeCl 3 Biomass materials are added to the aqueous solution for magnetization, and the magnetized materials are calcined to obtain magnetic biochar materials
[0004] However, the current iron source for preparing magnetic biochar basically adopts iron salt (for example: ferric chloride, ferrous chloride, etc.), which also increases the production cost to some extent. Therefore, it is necessary to find a new iron source as Magnets, cost reduction is another core issue that needs to be focused on
[0005] Carbon steel pickling waste is a kind of hazardous waste. How to comprehensively utilize it as a resource still has certain challenges. At present, carbon steel pickling waste is not used in the preparation of magnetic biochar

Method used

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  • Magnetic biochar for rapidly removing methylene blue and preparation method and application thereof
  • Magnetic biochar for rapidly removing methylene blue and preparation method and application thereof
  • Magnetic biochar for rapidly removing methylene blue and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A preparation method of magnetic biochar, comprising the steps of:

[0049] 1) bagasse is washed, crushed, dried, passed through a 100-mesh sieve, and stored for subsequent use;

[0050] 2) Add 10g of bagasse to 100mL of waste carbon steel pickling liquid, wherein the pH of the waste carbon steel pickling liquid is 1, the mass percentage of iron element is 12%, and the rotation speed is 100-150r / min. Stir for 6-12 hours, then centrifugally filter to obtain a solid mixture;

[0051]3) Put the solid mixture in a muffle furnace filled with nitrogen, calcinate at 600° C. for 0.5-2 hours, and pass through a 100-120 mesh sieve after cooling to obtain magnetic biochar.

[0052] Depend on figure 1 It can be seen that the magnetic biochar has a porous structure with well-developed pore structure, and C, O and Fe elements are detected on its surface, and Fe elements are evenly distributed on the surface of the biochar and the wall of the biochar channel;

[0053] Depend on f...

Embodiment 2

[0060] A preparation method of magnetic biochar, comprising the steps of:

[0061] 1) bagasse is washed, crushed, dried, crushed and sieved, passed through a 100-mesh sieve, and stored for subsequent use;

[0062] 2) Add 10g of bagasse to 200mL carbon steel pickling waste liquid, wherein the pH of the carbon steel pickling waste liquid is 1.5, the mass percentage of iron element is 6%, and the rotation speed is 100-150r / min. Stir for 6-12 hours, then centrifugally filter to obtain a solid mixture;

[0063] 3) Put the solid mixture in a muffle furnace filled with nitrogen, calcinate at 600° C. for 0.5-2 hours, and pass through a 100-120 mesh sieve after cooling to obtain magnetic biochar.

Embodiment 3

[0065] A preparation method of magnetic biochar, comprising the steps of:

[0066] 1) bagasse is washed, crushed, dried, crushed and sieved, passed through a 100-mesh sieve, and stored for subsequent use;

[0067] 2) Add 10g of bagasse to 300mL carbon steel pickling waste liquid, wherein the pH of the carbon steel pickling waste liquid is 2, the mass percentage of iron element is 3%, and the stirring speed is 100-150r / min. ~12h, then centrifuged to obtain a solid mixture,

[0068] 3) The solid mixture is placed in a muffle furnace filled with nitrogen, pyrolyzed at 600° C. for 0.5-2 hours, cooled and passed through 100-120 sieves to obtain magnetic biochar.

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Abstract

The invention discloses a magnetic biochar for rapidly removing methylene blue and a preparation method and an application thereof. The preparation method comprises the following steps: (1) adding a waste biomass to a carbon steel pickling waste liquid to obtain a mixture; (2) isolating oxygen, and calcining the mixture to obtain the magnetic biochar. The preparation method is simple and few in process steps, the reutilization of the waste biomass and the carbon steel pickling waste liquid is implemented, toxic and expensive reagents or other solvents are not required for use, thereby being beneficial to cost control and environmental protection. The magnetic biochar has a porous structure and has a remarkable removal effect on an organic dye, and is short in removal time, rapid and efficient; the removal method is simple; the magnetic biochar material is directly placed in the wastewater without any other complicated device and process; and the magnetic biochar is easy to popularize and use.

Description

technical field [0001] The invention belongs to waste resource utilization, in particular to a magnetic biochar for rapidly removing methylene blue and its preparation method and application. Background technique [0002] In recent years, magnetic biochar has attracted extensive attention due to its characteristics of easy separation, elution and regeneration, and good adsorption performance on pollutants. [0003] At present, the preparation methods of magnetic biochar mainly include liquid phase reduction method, liquid phase co-precipitation method and impregnation-pyrolysis method. Yi etc. [1] Magnetic biochar with nano-nickel-iron as the magnetic medium was prepared by liquid phase reduction method. The magnetic biochar has an efficient removal effect on BDE209, but this method needs to be pyrolyzed first to prepare biochar, and at the same time, it needs to use toxic and expensive reagents. (such as: sodium borohydride, etc.), shang, etc. [2] The preparation of magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/06B01J20/20B01J20/28009B01J20/28059B01J2220/4825B01J2220/4875C02F1/281C02F1/283C02F2101/308
Inventor 易云强陈俊毅方战强
Owner 广州润方环保科技股份有限公司
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