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Magnetic biochar composite adsorbent as well as preparation method and application thereof

A composite adsorption, biochar technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc. The effect of secondary pollution, reduction of adsorbent particle size, preparation method and simple operation process

Active Publication Date: 2020-05-29
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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  • Magnetic biochar composite adsorbent as well as preparation method and application thereof
  • Magnetic biochar composite adsorbent as well as preparation method and application thereof
  • Magnetic biochar composite adsorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] like figure 1 As shown, it is a preparation method of a magnetic biochar composite adsorbent, which comprises the following steps:

[0038] 1) Wash the collected discarded almond shells, place them in an oven, and dry them at 105°C overnight at a low temperature to obtain completely dried almond shells, pulverize them into powders with a pulverizer, and then grind the almond shell powders into powder. A 100-mesh sieve is used for later use 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 100 mL crucible, then place the crucible in a tube furnace, under nitrogen protection, at a temperature of 10 °C min. -1 The heating rate was heated to a constant temperature T, and the temperature was maintained for pyrolysis for 30 min, and 10.0 g of almond shell biochar was obtained after overnight cooling in a tube furnace;

[0040] 3) Take 2.0g of the almond shell biochar obtained in t...

Embodiment 2

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

[0052] 1) Wash the collected discarded almond shells, place them in an oven, and dry them at 105°C overnight at a low temperature to obtain completely dried almond shells, pulverize them into powders with a pulverizer, and then grind the almond shell powders into powder. A 100-mesh sieve is used for later use 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 100 mL crucible, then place the crucible in a tube furnace, under nitrogen protection, at a temperature of 10 °C min. -1 The heating rate was heated to 550 °C, maintained at this temperature for 30 min for pyrolysis, and 10.0 g of almond shell biochar was obtained after overnight cooling in a tube furnace;

[0054] 3) Take 2.0g of the almond shell biochar obtained in the above steps and spread it in a crucible, and use 5.6mL ...

Embodiment 3

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

[0072] 1) Wash the collected discarded almond shells, place them in an oven, and dry them at 105°C overnight at a low temperature to obtain completely dried almond shells, pulverize them into powders with a pulverizer, and then grind the almond shell powders into powder. A 100-mesh sieve is used for later use 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 100 mL crucible, then place the crucible in a tube furnace, under nitrogen protection, at a temperature of 10 °C min. -1 The heating rate was heated to 650 °C, maintained at this temperature for 30 min for pyrolysis, 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 obtained in the above steps and spread it in a crucible, and use 5.6 m...

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Abstract

The invention discloses a magnetic biochar composite adsorbent as well as a preparation method and application thereof, and belongs to the field of biochar materials. Almond shell biomass and ferrousnitrate are used as raw materials, the particle size fraction of the adsorbent is reduced through thermal degradation process magnetization and a mechanical ball milling process, and finally the magnetic biochar composite adsorbent is prepared. The prepared magnetic biochar composite adsorbent is applied to a phosphorus-containing aqueous solution and shaken to adsorption equilibrium at a constanttemperature, and the magnetic biochar adsorbent can be separated from the solution under the action of an external magnetic field after the reaction is completed, so that phosphorus in water is removed, and the adsorbent is separated and recycled. The method has the advantages of low cost, readily available materials, simplicity and convenience in operation, high treatment efficiency and the like, resource utilization, magnetic rapid separation, recovery and reutilization of biomass are realized, the iron-modified precursor is environment-friendly and free of secondary pollution, and the adsorbent can be applied to removal and recovery of excessive 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 a preparation method and application thereof. Background technique [0002] Phosphorus is an essential element for life, but excess phosphorus emitted 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 techniques, adsorption treatment is considered a promising method due to its low cost, high selectivity, eco-friendliness, and ease of operation. [0003] Iron (hydroxide) oxides have been extensively studied due to their outstanding high adsorption capacity, large specific surface area...

Claims

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Application Information

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Patent Type & Authority Applications(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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