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A kind of biochar airgel material and its preparation method and application

A biochar and aerogel technology, applied in aerogel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of long time-consuming phosphorus removal and inability to achieve rapid phosphorus removal.

Active Publication Date: 2022-04-12
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned airgel phosphorus removal adsorbent has a high adsorption capacity for phosphorus, it takes a long time (24 hours) to remove phosphorus and cannot achieve rapid phosphorus removal.

Method used

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  • A kind of biochar airgel material and its preparation method and application
  • A kind of biochar airgel material and its preparation method and application
  • A kind of biochar airgel material and its preparation method and application

Examples

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preparation example Construction

[0026] The present invention provides the preparation method of biochar airgel material described in above-mentioned technical scheme, comprises the following steps:

[0027] Biomass raw materials are subjected to pyrolysis carbonization reaction to obtain biochar;

[0028] The biochar is placed in a lanthanum salt solution for adsorption reaction and then freeze-dried to obtain a biochar airgel material.

[0029] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0030] In the invention, the biomass raw material is subjected to pyrolysis and carbonization reaction to obtain biochar. In the present invention, the biomass raw material preferably includes one or more of wax gourd, watermelon, radish and sugar cane; the watermelon is preferably a watermelon with the green skin removed (i.e. skin+pulp) or a watermelon with the green skin removed The watermelon rind and pu...

Embodiment 1

[0038] Cut the watermelon with the green skin removed into the same size as the lining of the hydrothermal reaction kettle, place it in the lining of the hydrothermal reaction kettle, perform pyrolysis and carbonization reaction at 180°C for 48 hours, and then soak it in 50% ethanol aqueous solution Until the solution is clarified, filter to obtain biochar;

[0039] The biochar was placed in a concentration of 5wt% lanthanum nitrate (La(NO 3 ) 3 ·6H 2 (0) solution, adsorption reaction 48h, filtration, the gained solid product was vacuum freeze-dried 48h under 0.2Pa,-10 ℃ of conditions, obtained biochar airgel material (recorded as watermelon (La3+ )).

[0040] The scanning electron microscope picture of the biochar airgel material prepared in this embodiment is as follows figure 1 shown by figure 1 It can be seen that the biochar airgel material prepared in this example is composed of a large number of particles, and forms a large number of nanoporous structures.

Embodiment 2

[0042] Prepare the biochar airgel material according to the method of Example 1. The difference from Example 1 is that the watermelon watermelon with the green skin removed is replaced with the watermelon skin with the green skin and flesh removed, and the temperature of the pyrolysis carbonization reaction is 160° C. to obtain Biochar airgel material (denoted as watermelon rind (La 3+ )).

[0043] The scanning electron microscope picture of the biochar airgel material prepared in this embodiment is as follows figure 2 shown by figure 2 It can be seen that the biochar airgel material prepared in this example is composed of a large number of particles, and forms a large number of nanoporous structures.

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Abstract

The invention provides a biochar airgel material and its preparation method and application, belonging to the technical field of phosphorus adsorbents. The biochar airgel material provided by the invention includes biochar and lanthanum ions; the surface of the biochar contains hydroxyl groups and carboxyl groups; and the lanthanum ions are bonded to the hydroxyl or carboxyl groups. The biochar airgel material provided by the invention can realize rapid and efficient phosphorus removal. The present invention uses biomass raw material as a carbon source to carry out pyrolysis carbonization reaction, and the obtained biochar maintains the unique structure of biomass, and the surface contains a large number of hydroxyl and carboxyl groups, which can be combined with lanthanum ions to improve the adsorption of phosphorus by the material properties; the source of preparation raw materials is wide and the cost is low; moreover, the preparation method is simple to operate and suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of phosphorus adsorbents, in particular to a biochar airgel material and its preparation method and application. Background technique [0002] Phosphorus is one of the important nutrients in aquatic ecosystems. However, excessive discharge of phosphorus into water will lead to the occurrence of harmful algal blooms, that is, eutrophication, which seriously deteriorates aquatic ecology. At present, the problem of phosphorus pollution is very serious, and it is imminent to solve the problem of water eutrophication caused by phosphorus pollution. The removal methods of phosphorus in water mainly include biological method, chemical precipitation method, ion exchange method, membrane treatment method and adsorption method. Among them, the adsorption method has the characteristics of simple and convenient operation, low treatment cost and good treatment effect, and is widely used. One of the most commonly used ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B01J20/20B01J20/28B01J20/30B01J20/32C02F1/28C02F101/10
CPCB01J13/0091B01J20/20B01J20/28047B01J20/3078B01J20/3236C02F1/288B01J2220/485C02F2101/105C02F2209/18
Inventor 陈永娟王家强和佼闫智英
Owner YUNNAN UNIV
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