Preparation method of grafting reinforced biochar-based heavy metal adsorption material

An adsorption material and biochar technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of high energy consumption and complicated biochar preparation process, achieve safe experimental operation, and improve the concentration of heavy metals. Adsorption and removal performance, beneficial effect of modification

Active Publication Date: 2021-10-08
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of complex biochar preparation process and high energy consumption in the prior art, it is urgent to find a biochar-based adsorption material with simple and efficient preparation methods, so as to further study its adsorption capacity for heavy metals and expand the range of heavy metals with excellent performance. Adsorbent material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method for an adsorbent, specifically comprising the following steps:

[0031] (1) bagasse is naturally air-dried, ground, and crossed an 80-mesh sieve;

[0032] (2) Sieve bagasse in a tubular muffle furnace, under oxygen-limited conditions, reach a pyrolysis temperature of 200°C at 10°C / min, keep at a constant temperature for 2 hours, and cool naturally to obtain bagasse biochar, which is sealed and stored;

[0033] (3) Under normal temperature conditions, 5g of bagasse biochar was added to 100mL of a mixed solution system containing 5g of NaOH and 5g of urea, and stirred and reacted for 30 minutes at 150r / min;

[0034] (4) Stirring rate is constant, and 0.5mL carbon tetrachloride is added in (3) reaction solution system, stirring reaction 3 hours;

[0035] (5) Stirring rate is constant, add 10mL sodium nitrite solution (containing sodium nitrite 1g) again in (4) reaction solution system, react for 3 hours, filter;

[0036] (6) Drying the filtered solid...

Embodiment 2

[0040] A preparation method for an adsorbent, specifically comprising the following steps:

[0041] (1) bagasse is naturally air-dried, ground, and crossed an 80-mesh sieve;

[0042](2) Sieve bagasse in a tubular muffle furnace, under oxygen-limited conditions, reach a pyrolysis temperature of 300°C at 10°C / min, keep at a constant temperature for 2 hours, and cool naturally to obtain bagasse biochar, which is sealed and stored;

[0043] (3) Under normal temperature conditions, 5g of bagasse biochar was added to 100mL of a mixed solution system containing 5g of NaOH and 20g of urea, and stirred and reacted for 30 minutes at 150r / min;

[0044] (4) Stirring rate is constant, adds 1mL carbon tetrachloride in (3) reaction solution system, stirring reaction 3 hours;

[0045] (5) Stirring speed is constant, add 10mL sodium nitrite solution (containing sodium nitrite 2g) again in (4) reaction solution system, react for 3 hours, filter;

[0046] (6) Drying the filtered solid in (5) a...

Embodiment 3

[0050] A preparation method for an adsorbent, specifically comprising the following steps:

[0051] (1) bagasse is naturally air-dried, ground, and crossed an 80-mesh sieve;

[0052] (2) Sieve bagasse in a tubular muffle furnace, under oxygen-limited conditions, reach a pyrolysis temperature of 200°C at 10°C / min, keep at a constant temperature for 2 hours, and cool naturally to obtain bagasse biochar, which is sealed and stored;

[0053] (3) Under normal temperature conditions, 5g of bagasse biochar was added to 100mL of a mixed solution system containing 5g of NaOH and 20g of urea, and stirred and reacted for 30 minutes at 150r / min;

[0054] (4) Stirring speed is constant, adds 2.5mL carbon tetrachloride in (3) reaction solution system, stirring reaction 3 hours;

[0055] (5) Stirring rate is constant, add 10mL sodium nitrite solution (containing sodium nitrite 5g) again in (4) reaction solution system, react for 3 hours, filter;

[0056] (6) Drying the filtered solid in (5...

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Abstract

The invention provides a preparation method of a grafting reinforced biochar-based heavy metal adsorption material, and relates to the technical field of biochar preparation. The preparation method of the adsorption material comprises the following steps of: (1) air-drying, grinding and sieving bagasse; (2) carrying out constant-temperature pyrolysis on the sieved bagasse, and naturally cooling to obtain bagasse biochar; (3) preparing a mixed solution system of NaOH and urea, adding the bagasse biochar, and stirring for reaction to obtain a solution system A; (4) adding halogenated hydrocarbon into the solution system A, and stirring for reaction to obtain a solution system B; and (5) adding a sodium nitrite solution into the solution system B, reacting, filtering and drying to obtain the adsorption material. The prepared nitro-grafted biochar has good adsorption capacity on heavy metals, has good adsorption effects on Cd and Sb, and can be effectively used for treatment of heavy metal-containing sewage.

Description

technical field [0001] The invention relates to the technical field of biochar preparation, in particular to a method for preparing a graft-strengthened biochar-based heavy metal adsorption material. Background technique [0002] Heavy metal pollutants have the characteristics of strong toxicity, refractory degradation, and easy enrichment, which seriously threaten the safety of ecosystems and human health in the environment, and have attracted widespread attention. Heavy metal cadmium pollution mainly comes from industrial "three wastes", agricultural production activities and natural environment erosion, and enters the regional environment under the action of atmospheric deposition, sewage irrigation and solid waste dissolution. If heavy metals are not treated in time, they will enter the ecosystem through the food chain, and eventually accumulate and threaten human health. Therefore, for the safety of the ecological environment, sustainable economic development, and soci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/20B01J20/02C02F1/288C02F1/286C02F1/283C02F1/281C02F2101/20
Inventor 罗明科牛远牛勇余辉陶艳茹王昊男孔令晖孟小凡
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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