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Magnetic composite material based on cow dung biochar and application thereof

A magnetic composite material and biochar technology, applied in the direction of water pollutants, alkali metal compounds, other chemical processes, etc., can solve the problems of weakening the cost and efficiency of adsorbents, and achieve the realization of waste resource reuse, low preparation cost, The effect of reducing recycling costs

Inactive Publication Date: 2019-11-29
HUAZHONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for low-surface-area biochar materials, co-precipitation reactions can negatively impact product porosity, and this method requires multiple steps and chemicals, which impairs the cost and efficiency of the adsorbent.

Method used

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  • Magnetic composite material based on cow dung biochar and application thereof
  • Magnetic composite material based on cow dung biochar and application thereof
  • Magnetic composite material based on cow dung biochar and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Put fresh cow dung in an oven and dry it at 105°C for 24 hours. After confirming the drying, crush it to 60-200 mesh to obtain dried cow dung powder, which is denoted as CM;

[0034] 2. Add 30g of cow dung powder to 300mL of 0.025mol / L ferric chloride solution, shake at a constant temperature of 25°C for 2h, then place it in an oven, react at 80°C for 2h, and then perform suction filtration to remove the filter cake Wash with water until the filtrate is neutral, then place the filter cake in an oven and dry at 80°C for 24 hours to obtain modified cow dung;

[0035] 3. Get 4g of modified cow dung and place it in the crucible, place the crucible in the tube furnace, and feed nitrogen into the tube furnace at a flow rate of 0.5L / min to ensure that it is a hypoxic environment (oxygen-containing environment) in the tube furnace. After the amount is less than 3%), heat the tube furnace. When the temperature in the tube furnace rises to 200°C, keep it at 200°C for 0.5h to p...

Embodiment 2-4

[0037] The operation steps and method are the same as in Example 1, except that the ferric chloride solution is changed to 0.05mol / L, 0.075mol / L and 0.1mol / L respectively.

Embodiment 5

[0039] The operation steps and methods are the same as in Example 1, except that the pyrolysis temperature of the modified cow dung is changed to 400°C, and the obtained magnetic composite material based on cow dung biochar is denoted as MCMB 0.025-400 .

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PUM

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Abstract

The invention discloses a magnetic composite material based on cow dung biochar and application thereof, and the magnetic composite material is prepared by the following methods: S1, drying fresh cowdung and crushing to obtain dried cow dung powder; S2, adding the cow dung powder into a ferric chloride solution, oscillating at constant temperature, reacting at 70-90 DEG C for 1-4 hours, filtering, washing and drying to obtain modified cow dung; S3, pyrolyzing the modified cow dung in a nitrogen atmosphere for 0.2 to 2 hours at a pyrolysis temperature of 200 to 800 DEG C, and cooling to room temperature to obtain the magnetic composite material based on the cow dung biochar. The composite material has large specific surface area, high adsorption efficiency, excellent magnetization performance and convenient separation and recycling, therefore, the composite material can be used for removing acid-base organic matters in water bodies, such as methylene blue, Congo red and the like, and has high removal rate.

Description

technical field [0001] The invention belongs to the technical field of waste resource recycling, and in particular relates to a magnetic composite material based on cow dung biochar and its application. Background technique [0002] Large-scale farming has caused serious manure problems. Improper treatment not only affects the environment, but also restricts the healthy development of the livestock and poultry breeding industry. At the same time, the livestock and poultry wastewater produced has seriously affected the modernization of agriculture. Adsorption is one of the best treatment methods, and biochar has been widely researched and applied due to its low cost and good effect. The previous research found that low-temperature pyrolysis cow dung biochar has a good adsorption effect on basic organic methylene blue, but with the progress of biochar adsorption research, there are two outstanding problems restricting its development. One is the anion pollutants of biochar. S...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28C02F1/28B01J20/30C02F101/34C02F101/36C02F101/38
CPCB01J20/20B01J20/28009C02F1/283C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 易宝军朱瑶袁巧霞孙正帅宗志喜杨雪琦
Owner HUAZHONG AGRICULTURAL UNIVERSITY