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Preparation method and application of nano silver-bamboo shoot shell biochar composite material

A composite material and biochar technology, applied in separation methods, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of poor selectivity, difficulty in using bamboo shoot shells, and small adsorption capacity, and achieve low cost and reduce environmental pollution. Effect

Active Publication Date: 2019-09-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Agricultural and forestry wastes, such as the bulk by-products of the bamboo shoot processing industry, are difficult to use, and are generally incinerated or landfilled, which is likely to cause environmental pollution, but they can be used as cheap, green and sustainable raw materials for the preparation of biochar, but the obtained raw materials Biochar is used to adsorb and separate low-concentration rhenium in the solution, which has the disadvantages of small adsorption capacity and poor selectivity. It needs to be modified to improve its performance.

Method used

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  • Preparation method and application of nano silver-bamboo shoot shell biochar composite material

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Embodiment 1

[0029] A preparation method of nano silver-bamboo shoot shell biochar composite material, comprising the following steps:

[0030] (1) Granulation: wash the shells of bamboo shoots, dry them at 60°C, crush them, and pass through a 60-mesh sieve;

[0031] (2) Carbonization: Take an appropriate amount of sieved bamboo shoot shells, put them in a tube furnace, and put N 2 The flow rate was 100 mL / min, carbonized at 500 °C for 4 h, cooled to room temperature, taken out, washed until neutral, and dried to obtain bamboo shoot shell biochar;

[0032] (3) Silver loading: take 1 g of bamboo shoot shell biochar and 25 mL of silver nitrate-citric acid solution (the molar ratio of silver nitrate and citric acid is 1:1, the concentration of silver nitrate is 1 mmol / L, and the concentration of citric acid is 1 mmol / L. L) Mix, add 9 mL of 10 mmol / L ascorbic acid solution dropwise, place in a water bath at 25 °C, stir, soak for 6 h, filter, wash until neutral, and dry at 70 °C;

[0033] (4)...

Embodiment 2

[0035] A preparation method and application of nano silver-bamboo shoot shell biochar composite material, comprising the following steps:

[0036] (1) Granulation: wash the shells of bamboo shoots, dry them at 100°C, crush them, and pass through a 20-mesh sieve;

[0037] (2) Carbonization: Take an appropriate amount of sieved bamboo shoot shells, put them in a tube furnace, and put CO 2 The flow rate was 100 mL / min, carbonized at 200°C for 6 h, cooled to room temperature, taken out, washed until neutral, and dried to obtain bamboo shoot shell biochar;

[0038] (3) Silver loading: take 1g bamboo shoot shell biochar and 30mL silver nitrate-citric acid solution (the molar ratio of silver nitrate and citric acid is 1:1, the concentration of silver nitrate is 1 mmol / L, and the concentration of citric acid is 1 mmol / L ), then add 12 mL of 15 mmol / L ascorbic acid solution dropwise to the mixed solution, place in a water bath at 25 °C, stir, soak for 12 h, filter, wash until neutral,...

Embodiment 3

[0041] A preparation method and application of nano silver-bamboo shoot shell biochar composite material, comprising the following steps:

[0042] (1) Granulation: wash the bamboo shoot shells, dry them at 80°C, and then pulverize them to obtain the bamboo shoot shell powder and pass through a 100-mesh sieve;

[0043] (2) Carbonization: take an appropriate amount of sieved bamboo shoot shells, put them in a tube furnace, pass them into argon at a flow rate of 100 mL / min, carbonize at 600 °C for 2 h, take them out after cooling to room temperature, wash until neutral, and dry , to prepare bamboo shoot shell biochar;

[0044] (3) Silver loading: take 1 g of bamboo shoot shell biochar and 35 mL of silver nitrate-citric acid solution (the molar ratio of silver nitrate and citric acid is 1:1, the concentration of silver nitrate is 1 mmol / L, and the concentration of citric acid is 1 mmol / L. L) Mix, then add 15mL 20mmol / L ascorbic acid solution dropwise to the mixed solution, place ...

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Abstract

The invention discloses a preparation method and application of a nano silver-bamboo shoot shell biochar composite material. The preparation method comprises the following steps: 1) granulation: pulverizing washed and dried bamboo shoot shells, and sieving; 2) carbonization: carbonizing the bamboo shoot shells at a certain temperature under an inert atmosphere and cooling to room temperature, taking out, washing with deionized water to neutral, and drying to prepare bamboo shoot shell biochar; 3) silver loading: mixing the bamboo shoot shell biochar and a silver nitrate-citric acid solution, dropwise adding an ascorbic acid solution, placing in a water bath and stirring, impregnating, filtering, washing, and drying; 4) activation: taking an appropriate amount of a product obtained in step 3), activating under an inert atmosphere for a certain period of time, then cooling to room temperature, washing to neutral, and drying to obtain the nano silver-bamboo shoot shell biochar composite material. The nano silver-bamboo shoot shell biochar composite material is prepared by the invention through utilizing the bamboo shoot shells of forestry and agricultural residue as a raw material; the raw material is rich, the preparation is simple, and the adsorption effect on perrhenate in a smelting waste acid solution is remarkable.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method and application of a nano-silver-bamboo shoot shell biochar composite material. Background technique [0002] Rhenium is a rare element, silver-white metal, with high strength, high melting point, excellent ductility, mechanical stability and plasticity, and is an important metal material. Rhenium and its alloys are widely used in petrochemical, national defense, aerospace, metallurgy and other industries. [0003] The abundance of rhenium in the earth's crust is low, and there is no mineral available for direct mining. It is usually associated with molybdenite and porphyry copper ore in the form of rhenium disulfide or rhenium heptasulfide. During the smelting process, rhenium mainly enters the smelting acid waste liquid in the form of perrhenate ions. The smelting acid waste liquid has the characteristics of low rhenium content, str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D15/00
CPCB01D15/00B01J20/02B01J20/20B01J20/28061B01J20/3078B01J20/3085B01J2220/4881
Inventor 胡晖吕晨光汪湉王春雪
Owner FUZHOU UNIV
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