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Preparation of iron-based biochar wave-absorbing material and method for repairing mercury-polluted soil through synergy of iron-based biochar wave-absorbing material and microwaves

A biochar, mercury pollution technology, applied in the field of soil remediation, can solve the problems of high soil mercury content, incomplete remediation, high energy consumption, etc., and achieves the effects of high treatment efficiency, suitable for popularization and use, and low implementation temperature.

Pending Publication Date: 2021-12-31
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the treatment time of this method is short, the temperature used in this method is high, the energy consumption is large, and the mercury content in the soil treated by this method is still high, and the restoration is not thorough enough.

Method used

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  • Preparation of iron-based biochar wave-absorbing material and method for repairing mercury-polluted soil through synergy of iron-based biochar wave-absorbing material and microwaves
  • Preparation of iron-based biochar wave-absorbing material and method for repairing mercury-polluted soil through synergy of iron-based biochar wave-absorbing material and microwaves
  • Preparation of iron-based biochar wave-absorbing material and method for repairing mercury-polluted soil through synergy of iron-based biochar wave-absorbing material and microwaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Grind the shell biochar through a 60-mesh sieve, soak it in 1mol / L phosphoric acid, stir it for 24 hours, wash it with distilled water until neutral, and dry it.

[0026] 2. For the biochar dried in the previous step, mix it with FeCl at a mass ratio of 1:3 3 The solutions were mixed, hydrothermally reacted at 180°C for 12 hours, and washed with distilled water several times after cooling to obtain iron-based biochar.

[0027] 3. Take mercury-contaminated soil (mercury content is 26.875mg / kg) around a mine, remove debris such as grass roots and gravel, air-dry and grind it and pass it through a 60-mesh sieve;

[0028] 4. Weigh 5 parts of the pretreated soil, 100g each, add 5, 6, 7, 8, 10g of iron-loaded biochar respectively, shake and mix for 5min, then put it into the microwave reactor, set the reaction temperature to 200℃, time The reaction time was 60min and the microwave heating power was 600w.

[0029] After the reaction, first add aqua regia (acid mixed with ...

Embodiment 2

[0034] 1. Grind the shell biochar through a 60-mesh sieve, soak it in 1mol / L phosphoric acid, stir it for 24 hours, wash it with distilled water until neutral, and dry it.

[0035] 2. For the biochar dried in the previous step, mix it with FeCl at a mass ratio of 1:3 3 The solutions were mixed, hydrothermally reacted at 180°C for 12 hours, and washed with distilled water several times after cooling to obtain iron-based biochar.

[0036] 3. Take mercury-contaminated soil (mercury content is 26.875mg / kg) around a mine, and remove debris such as grass roots and gravel. Air-dried and ground and passed through a 60-mesh sieve;

[0037] 4. Weigh 5 parts of the pretreated soil, 100g each, add 8g of iron-loaded biochar respectively, shake and mix for 5min, put them into the microwave reactor, and set the reaction temperature to 150°C, 165°C, 180°C, 195°C respectively , 210°C, the time is 60min, and the microwave heating power is 600w to carry out the reaction.

[0038] After the re...

Embodiment 3

[0044] 1. Grind the shell biochar through a 100-mesh sieve, soak it in 3mol / L phosphoric acid, stir it for 12 hours, wash it with distilled water until neutral, and dry it.

[0045] 2. For the biochar dried in the previous step, mix it with FeSO at a mass ratio of 1:6 4 The solutions were mixed, hydrothermally reacted at 200°C for 8 hours, and washed with distilled water several times after cooling to obtain iron-based biochar.

[0046] 3. Take mercury-contaminated soil (mercury content is 145.475mg / kg) around a mine, remove debris such as grass roots and gravel, air-dry and grind it and pass it through a 100-mesh sieve;

[0047] 4. Weigh 5 parts of the pretreated soil, 100g each, add 8g of iron-loaded biochar, shake and mix for 5 minutes, then put it into the microwave reactor, set the reaction temperature to 200°C, and set the time to 60min, 80min, and 100min respectively , 120min, and the microwave heating power was set to 600w for reaction.

[0048] After the reaction, m...

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Abstract

The invention discloses a preparation method of an iron-based biochar wave-absorbing material and a method for repairing mercury-polluted soil through the synergy of the iron-based biochar wave-absorbing material and microwaves. The preparation method comprises the following steps of: grinding biochar, soaking the biochar in 1-3mol / L phosphoric acid for a period of time; mixing the biochar with an iron salt solution in a mass ratio of 1: (3-6); and carrying out a hydrothermal reaction at 180-200 DEG C to obtain the iron-based biochar. The iron-based biochar is added into mercury-polluted soil according to a ratio of (5-10)%, the iron-based biochar is uniformly mixed with the mercury-polluted soil, and a reaction is performed in a microwave reactor at 150-220 DEG C for 60-120 minutes to remove mercury. The removal rate of the iron-based biochar wave-absorbing material for mercury in the mercury-contaminated soil reaches 90% or above; the iron-based biochar wave-absorbing material has the advantages of good remediation effect, short time, high efficiency and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and specifically relates to a method for remediating mercury-contaminated soil, and more specifically, to a method for microwave thermal desorption of mercury-contaminated soil. Background technique [0002] Mercury pollution is a global problem. Mercury is a refractory toxic metal element, which is persistent, mobile and highly bioaccumulative, and endangers the health of animals and humans through the food chain. Mercury pollution in soil mainly comes from ore mining and smelting, discharge of mercury-containing wastewater, atmospheric deposition, use of mercury-containing pesticides and fertilizers, and discharge of industrial solid waste such as chlor-alkali salt mud. Therefore, choosing an appropriate and efficient remediation method for mercury-contaminated soil remediation is of great significance to the governance of the ecological environment and the protection of human health....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06C01B32/05
CPCB09C1/06C01B32/05
Inventor 林亲铁刘煜欣张轩玮王玉鹏赖俊烨赵梓锐何金
Owner GUANGDONG UNIV OF TECH
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