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A kind of magnetic biochar composite adsorbent and its preparation method and application

A composite adsorption and biochar technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve environmental pollution by-products, loss of material performance, excess waste liquid, etc., to avoid secondary Less pollution, enhanced load level, low price effect

Active Publication Date: 2021-06-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional hydrothermal co-precipitation method requires a large amount of chemicals, and excess waste liquid will be generated during the preparation process, forming environmental pollution by-products; and the existing preparation methods have the disadvantages of complicated operation, high cost and particle agglomeration , will limit the practical application and lead to the loss of material properties

Method used

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  • A kind of magnetic biochar composite adsorbent and its preparation method and application
  • A kind of magnetic biochar composite adsorbent and its preparation method and application
  • A kind of magnetic biochar composite adsorbent and its preparation method and application

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Effect test

Embodiment 1

[0037] Such as figure 1 Shown, be a kind of preparation method of magnetic biochar composite adsorbent, it comprises the following steps:

[0038] 1) Wash the collected discarded almond shells, put them in an oven, and dry them at a low temperature overnight at 105°C. After obtaining completely dry almond shells, grind them into powder with a grinder, and then grind the almond shells into powder 100 mesh sieves are standby to obtain almond shell powder biomass;

[0039] 2) Take 15.0 g of the almond shell powder biomass obtained in the above steps and spread it in a 100mL crucible, then place the crucible in a tube furnace, and heat it at 10°C min under the protection of nitrogen. -1 The heating rate was heated to a constant temperature T, and the pyrolysis was maintained at this temperature for 30 minutes, and 10.0 g of almond shell biochar was obtained after overnight cooling in a tube furnace;

[0040] 3) Take 2.0 g of the almond shell biochar prepared in the above steps a...

Embodiment 2

[0051] A preparation method of a magnetic biochar composite adsorbent, comprising the following steps:

[0052] 1) Wash the collected discarded almond shells, put them in an oven, and dry them at a low temperature overnight at 105°C. After obtaining completely dry almond shells, grind them into powder with a grinder, and then grind the almond shells into powder 100 mesh sieves are standby to obtain almond shell powder biomass;

[0053] 2) Take 15.0 g of the almond shell powder biomass obtained in the above steps and spread it in a 100mL crucible, then place the crucible in a tube furnace, and heat it at 10°C min under the protection of nitrogen. -1 The heating rate was heated to 550°C, and the pyrolysis was maintained at this temperature for 30 minutes, and 10.0 g of almond shell biochar was obtained after overnight cooling in a tube furnace;

[0054] 3) Take 2.0 g of the almond shell biochar prepared in the above steps and spread it in a crucible, and use 5.6 mL of 1M Fe(NO ...

Embodiment 3

[0071] A preparation method of a magnetic biochar composite adsorbent, comprising the following steps:

[0072] 1) Wash the collected discarded almond shells, put them in an oven, and dry them at a low temperature overnight at 105°C. After obtaining completely dry almond shells, grind them into powder with a grinder, and then grind the almond shells into powder 100 mesh sieves are standby to obtain almond shell powder biomass;

[0073] 2) Take 15.0 g of the almond shell powder biomass obtained in the above steps and spread it in a 100mL crucible, then place the crucible in a tube furnace, and heat it at 10°C min under the protection of nitrogen. -1 The heating rate was heated to 650°C, and pyrolysis was maintained at this temperature for 30 minutes, and 10.0 g of almond shell biochar was obtained after overnight cooling in a tube furnace;

[0074] 3) Take 2.0 g of the almond shell biochar prepared in the above steps and spread it in a crucible, and use 5.6 mL of Fe(NO 3 ) 2...

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Abstract

The invention discloses a magnetic biochar composite adsorbent, a preparation method and an application thereof, and belongs to the field of biochar materials. The invention uses almond shell biomass and ferrous nitrate as raw materials, magnetizes through a thermal degradation process, reduces the particle size of the adsorbent through a mechanical ball milling process, and finally prepares a magnetic biochar composite adsorbent. Apply the prepared magnetic biochar composite adsorbent to phosphorus-containing aqueous solution, and shake it at a constant temperature until the adsorption equilibrium is reached. After the reaction is completed, under the action of an external magnetic field, the magnetic biochar adsorbent can be separated from the solution to complete the water purification process. Phosphorus removal and separation and recovery of adsorbent. The invention has the advantages of low cost, easy to obtain materials, easy operation and high treatment efficiency, and realizes resource utilization of biomass, rapid magnetic separation, recovery and reuse, and the iron-modified precursor is environmentally friendly and has no secondary pollution, and can be applied Removal and recovery of excess phosphorus in industrial and agricultural wastewater.

Description

technical field [0001] The invention belongs to the field of biochar materials, and in particular relates to a magnetic biochar composite adsorbent and its preparation method and application. Background technique [0002] Phosphorus is an essential element for life, but excess phosphorus discharged from agricultural runoff or municipal wastewater can negatively impact aquatic ecosystems. Therefore, there is great potential to develop efficient and sustainable methods to remove phosphorus from wastewater and recover it as fertilizer. Current research involves various methods such as biological treatment, membrane separation, chemical precipitation, electrolysis and adsorption. Among these technologies, adsorption treatment is considered as a promising method because of its low cost, high selectivity, eco-friendliness and easy operation. [0003] Iron(hydr)oxides have been extensively studied due to their outstanding high adsorption capacity, large specific surface area and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28C02F1/28B01J20/30C02F101/10
CPCB01J20/06B01J20/20B01J20/28009B01J2220/4837C02F1/288C02F2101/105
Inventor 梁新强刘枫何霜王子琬晋迎兵
Owner ZHEJIANG UNIV
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