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Method for preparing rare earth perovskite/biochar composite material from forestry and agricultural residues and application of rare earth perovskite/biochar composite material

A technology of agricultural and forestry waste and composite materials, which is applied in the field of preparing rare earth perovskite/biochar composite materials, can solve the problems of waste of resources and utilization rate of less than 10%, and achieve reduction of preparation costs, increase of effective contact, and improvement of catalytic activity Effect

Active Publication Date: 2021-04-06
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Agricultural and forestry wastes such as straws, pomegranate peels, rice husks, leaves, petals, etc. are rich in lignocellulose, which has a wide range of sources and is cheap. The world produces about 1 trillion tons of biomass resources every year, but its utilization rate is less than 10%, resulting in huge waste of resources

Method used

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  • Method for preparing rare earth perovskite/biochar composite material from forestry and agricultural residues and application of rare earth perovskite/biochar composite material
  • Method for preparing rare earth perovskite/biochar composite material from forestry and agricultural residues and application of rare earth perovskite/biochar composite material
  • Method for preparing rare earth perovskite/biochar composite material from forestry and agricultural residues and application of rare earth perovskite/biochar composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Take the pomegranate skin and dry and graze it to get the pomegranate powder. 1.30 g of nitrate and 1.60 g of iron nitrate were dissolved in 100 ml of deionized water, and 3.0 g of pomegranate powder was added, stirred at 60 ° C, stirred for 6 h, and the pH was added to neutral, and the resulting suspension was filtered. The dry research was ground to get the powder, and the air furnace is 150 ° C (temperature rise rate 2 ° C / min) to heat the temperature for 2 h, and the finished product is obtained (Lafeo3 / C).

[0033]X-ray powder diffraction experiment was performed on the obtained sample, and its morphology and structure were observed under transmissive electron microscopy, and the iron-carbon / biocarbon nanostructure composite made of process parameters of Example 1 was obtained, and XRD spectrum with ferrite Such asfigure 1 Disted by control Lafeo3The PDF card can be known, at the angle = 22.6 °, 32.2 °, 39.7 °, 46.2 °, 57.4 °, 67.4 °, etc., Lafeo appears.3A unique diffr...

Embodiment 2

[0039]Take a straw to wash and dry and graze it, get straw powder. It is weighed 1.30 g of nitrate and 1.60 g of nitrate dissolved in 100 ml of deionized water, add 4.5 g of straw powder, stirring at 80 ° C, heat at 8 h, and the pH is added to neutral, and the resulting suspension is filtered. Grinding powder, the air under the air furnace 250 ° C (temperature rise rate 2 ° C / min) is held for 2 h, and the finished product is obtained (0.75LAFEO)3 / C).

[0040]Subsequent tests as in Example 1,120min NH4+The concentration reached 0.051 g / L.

Embodiment 3

[0042]Wash the lotus petal to dry and graze it to get the lotus petal powder. It is weighed 1.30 g of nitrate and 1.60 g of iron nitrate dissolved in 100 ml of deionized water, add 6.0 g of a water lobe powder, stirred at 90 ° C, stir in 9 h, and add ammonia to regulate pH to neutral, the resulting suspension is filtered Dry research grinding the powder, the air under the air furnace 350 ° C (heating rate 2 ° C / min) is held 2 h, and the finished product is obtained (0.5LAFEO)3 / C).

[0043]Subsequent tests as in Example 1,120min NH4+The concentration reached 0.047 g / L.

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Abstract

The invention belongs to the field of green synthesis of carbon-based composite materials, and particularly relates to a method for preparing a rare earth perovskite / biochar composite material from forestry and agricultural residues and application of the rare earth perovskite / biochar composite material. The method comprises the following steps: cleaning, drying and grinding forestry and agricultural residues, adding the ground forestry and agricultural residues, rare earth nitrate and transition metal nitrate into deionized water in proportion, and conducting heating and stirring in a water bath to obtain turbid liquid; dropwise adding ammonia water to adjust the pH value to be neutral, and conducting drying and grinding to obtain powder; and calcining the obtained powder in a muffle furnace, conducting grinding to obtain the rare earth perovskite / biochar composite material. The rare earth perovskite / biochar composite material is applied to photocatalytic synthesis of ammonia. A two-dimensional biochar nanosheet loaded rare earth perovskite composite material is prepared from rich forestry and agricultural residues in nature as raw materials by a solution combustion method at a low temperature, and has the advantages of good dispersibility, low raw material cost, simple and convenient synthesis method and the like, and the prepared rare earth perovskite / biochar composite material has an excellent photocatalytic synthesis ammonia effect.

Description

Technical field[0001]The present invention belongs to the field of green synthesis of carbon-based composite, and more particularly to a method of preparing a rare earth calcium ore / biocarbon composite material in a low temperature waste biomass, low temperature and its application in ammonia in photocatalytic nitrogen synthesis.Background technique[0002]The traditional iron-based catalyst Haber-Bosch process has been widely used in nitrogen synthesis ammonia, but the reaction needs to be carried out under high temperature and high pressure, and the energy consumption is huge, and today, it is urgent to find a new one. Synthetic ammonia method.[0003]In recent years, solar photocatalytic technology has been used to transform solar energy into chemical energy, and the ammonia to achieve light solid nitrogen synthesis is concerned. At present, there is only an absorption of absorption of ultraviolet light in the ultraviolet portion, and the development of catalysts that have catalyti...

Claims

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Application Information

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IPC IPC(8): B01J23/83C01C1/04
CPCB01J23/83C01C1/04C01C1/0411B01J35/39Y02P20/52
Inventor 李霞章刘威纪俊玲左士祥姚超朱劼陈群
Owner CHANGZHOU UNIV
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