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Preparation method of magnetic activated carbon and magnetic activated carbon prepared thereby

A magnetic activated carbon and activated carbon technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of limited adsorption and removal of pollutants, easy scattering of activated carbon, and difficulty in recycling. Achieve the effect of increasing the specific surface area of ​​the product, rich pore structure, and excellent adsorption performance

Inactive Publication Date: 2017-09-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ordinary activated carbon has the characteristics of high ash content, small pore volume, wide micropore distribution, small specific surface area and poor adsorption selectivity, and the density of powder activated carbon is small, and it is not easy to settle in water. Activated carbon after adsorbing heavy metal pollutants It is easy to scatter and settle in water, which will cause secondary pollution to the environment, so the recycling of powder activated carbon after use is a difficult problem
Coupled with some limitations of its surface functional groups and electrochemical properties, its adsorption and removal of pollutants is limited, and it is far from meeting the requirements of domestic and foreign markets.

Method used

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  • Preparation method of magnetic activated carbon and magnetic activated carbon prepared thereby
  • Preparation method of magnetic activated carbon and magnetic activated carbon prepared thereby
  • Preparation method of magnetic activated carbon and magnetic activated carbon prepared thereby

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Effect test

Embodiment 1

[0026] A preparation method of magnetic activated carbon, cellulose sol preparation: firstly take 16g of cellulose and 0.5g of urea in a 100ml beaker, add 60ml of zinc chloride aqueous solution with a mass fraction of 70%, and stir quickly and uniformly at a speed of 350r / min for 30min , to obtain a transparent sol; the use of cellulose as a carbon source is because cellulose is easy to form a transparent colloid after rapid stirring of zinc chloride, and activated carbon materials with high specific surface area can be prepared after high temperature activation. Vacuum freeze-drying: cut the above-mentioned transparent sol into 2cm thick slices, freeze in liquid nitrogen, and dry the frozen samples in a vacuum freeze dryer; vacuum freeze-drying makes the ice crystals in the samples sublimate directly, so that the product can keep Many tiny pore structures are conducive to high temperature activation to form a pore effect. High-temperature pyrolysis activation: put the freeze-...

Embodiment 2

[0029] A preparation method of magnetic activated carbon, cellulose sol preparation: firstly take 16g of cellulose and 0.5g of urea in a 100ml beaker, add 60ml of zinc chloride aqueous solution with a mass fraction of 70%, and stir quickly and uniformly at a speed of 350r / min for 30min , to obtain a transparent sol. Vacuum freeze-drying: the above-mentioned transparent sol was cut into thin slices with a thickness of 2 cm, frozen in liquid nitrogen, and the frozen samples were dried in a vacuum freeze dryer. High-temperature pyrolysis activation: put the freeze-dried product in a porcelain boat and put it in the middle of the tube furnace, and pyrolyze it under the protection of nitrogen. The heating rate is 5°C / min, the temperature is raised to 700°C, heat treatment is carried out for 4 hours, and the flow rate of nitrogen gas is 30mL / min. °C in a vacuum oven for 12 hours to obtain an intermediate product of activated carbon with a high specific surface area. Ultrasonic ble...

Embodiment 3

[0032] A preparation method of magnetic activated carbon, cellulose sol preparation: firstly take 16g of cellulose and 0.5g of urea in a 100ml beaker, add 60ml of zinc chloride aqueous solution with a mass fraction of 70%, and stir quickly and uniformly at a speed of 350r / min for 30min , to obtain a transparent sol. Vacuum freeze-drying: the above-mentioned transparent sol was cut into thin slices with a thickness of 2 cm, frozen in liquid nitrogen, and the frozen samples were dried in a vacuum freeze dryer. High-temperature pyrolysis activation: put the freeze-dried product in a porcelain boat and put it in the middle of the tube furnace, and pyrolyze it under the protection of nitrogen. The heating rate is 5°C / min, the temperature is raised to 800°C, heat treatment is performed for 2 hours, and the flow rate of nitrogen gas is 30mL / min. °C in a vacuum oven for 12 hours to obtain an intermediate product of activated carbon with a high specific surface area. Ultrasonic blend...

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Abstract

The invention discloses a preparation method of magnetic activated carbon and magnetic activated carbon prepared thereby; the preparation method of the magnetic activated carbon having high specific surface area comprises the steps of preparing cellulose sol, lyophilizing in vacuum, pyrolytically activating at high temperature, ultrasonically blending and loading, hydrothermally carbonizing at low temperature and magnetizing, and the other steps. Compared with the prior art, the preparation method has the advantages that the magnetic activated carbon prepared via multiple techniques has larger specific surface and richer pore structure than traditional activated carbon, also has magnetism evenly distributed, and is better than traditional single activated carbon materials in terms of adsorbing heavy metals in industrial wastewater and domestic wastewater.

Description

technical field [0001] The invention relates to the technical field of energy and chemical industry, in particular to a method for preparing magnetic activated carbon using cellulose as a carbon source and the prepared magnetic activated carbon. Background technique [0002] Heavy metal chromium pollution mainly comes from mining, electroplating, pigments and other industrial wastewater and landfill leachate, among which Cr6+ has strong oxidation, corrosion and biological toxicity, and will produce teratogenic, carcinogenic and Mutagenic, a serious threat to human health. Therefore, Cr6+ is listed as one of the eight most harmful chemical substances to the human body, and is an internationally recognized carcinogen. The treatment of Cr6+ polluted water is urgent. Among the treatment methods of various heavy metal pollution, the adsorption method has the advantages of low treatment cost, simple operation and good purification effect, so it has attracted attention. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C01B32/318C01B32/354C02F1/28
CPCB01J20/20B01J20/0229B01J20/28009B01J20/28066C01P2006/12C02F1/281C02F1/283
Inventor 邢献军刘建华朱成成陈泽宇张学飞
Owner HEFEI UNIV OF TECH
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