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In-site remediation method for permanently removing heavy metal in farmland soil

An in-situ repair and heavy metal technology, applied in the restoration of polluted soil, etc., can solve the problems of long cycle and slow repair time, and achieve the effect of stable nature, strong adsorption capacity, and not easy to lose.

Active Publication Date: 2016-03-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the restoration plants described in this method are annual crops, the cycle is long, and the restoration time is relatively slow.

Method used

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  • In-site remediation method for permanently removing heavy metal in farmland soil
  • In-site remediation method for permanently removing heavy metal in farmland soil

Examples

Experimental program
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Effect test

preparation example Construction

[0029] (1) preparation of porous carrier material, it comprises the following steps:

[0030] (a) place the attapulgite in the container, then add sulfuric acid with a molar concentration of 2-4mol / L in the container, wherein sulfuric acid: the attapulgite ratio is 4ml:1g-6ml:1g;

[0031] (b) placing the attapulgite soaked in sulfuric acid at 18-25°C for 60-120min;

[0032] (c) rinsing the acidified attapulgite with distilled water until the pH is 6-8;

[0033] (d) suction filtering the above mixture, and drying the solid obtained by suction filtration;

[0034] (e) Grinding the dried attapulgite and passing through a 150-mesh sieve, the obtained undersize is a porous carrier material;

[0035] (2) preparation of modified composite material, it may further comprise the steps:

[0036] (a) taking the porous carrier material prepared in the step (1) and dropping into a toluene solvent to make a porous carrier material toluene solution, wherein toluene: the ratio of the porous...

Embodiment 1

[0045] (1) prepare porous carrier material, concrete steps are:

[0046] (a) the attapulgite is placed in the container, then add 2mol / L sulfuric acid in the container, wherein sulfuric acid: the ratio of the attapulgite is 4ml:1g;

[0047] (b) Place the attapulgite soaked in sulfuric acid at 20°C for 60 minutes;

[0048] (c) rinsing the acidified attapulgite with distilled water until the pH is 6;

[0049] (d) Suction filter the above mixture for about 10 minutes, and dry the solid obtained by suction filtration at 120° C.;

[0050] (e) Grinding the dried attapulgite and passing through a 150-mesh sieve, and the obtained undersize is a porous carrier material.

[0051] (2) Prepare the modified composite material, the specific steps are:

[0052] (a) take by weighing 5.0g porous carrier material and drop in the toluene solvent of 100ml, make porous carrier material toluene solution;

[0053] (b) Add 1.0 g of diethylenetriaminopropyltrimethoxysilane (TPDA) dropwise to the tol...

Embodiment 2

[0061] (1) prepare porous carrier material, concrete steps are:

[0062] (a) the attapulgite is placed in the container, then add 3mol / L sulfuric acid in the container, wherein sulfuric acid: the ratio of the attapulgite is 5ml:1g;

[0063] (b) Place the attapulgite soaked in sulfuric acid at 18°C ​​for 90 minutes;

[0064] (c) rinsing the acidified attapulgite with distilled water until the pH is 8;

[0065] (d) Suction filter the above mixture for about 10 minutes, and dry the solid obtained by suction filtration at 120° C.;

[0066] (e) Grinding the dried attapulgite and passing through a 150-mesh sieve, and the obtained undersize is a porous carrier material.

[0067] (2) Prepare the modified composite material, the specific steps are:

[0068] (a) take by weighing 5.0g porous carrier material and drop in the toluene solvent of 150ml, make porous carrier material toluene solution;

[0069] (b) Add 2.0 g of diethylenetriaminopropyltrimethoxysilane (TPDA) dropwise to the...

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Abstract

The invention discloses an in-site remediation method for permanently removing heavy metal in farmland soil. The method comprises the following steps: (1) preparing a porous support material; (2) preparing a modified compound material, namely, (a) weighting the porous support material prepared in step (1) and then adding to a toluene solvent to prepare a porous support material toluene solution; (b) dropwise adding TPDA to the prepared porous support material toluene solution, and then reacting under the temperature of 80 to 120 DEG C so as to obtain an amino modified porous support material; (c) centrifugally separating the prepared amino modified porous support material to obtain a solid, and washing the solid; (d) drying the washed solid in a vacuum drying box which is at the temperature of 60 to 80 DEG C, so as to obtain the modified compound material. The modified compound material is high in absorbing capacity for various kinds of heavy metal and cannot damage the soil; in addition, the physical properties of the soil can be effectively improved, and particularly the water-retaining performance and air breathability of the soil can be improved.

Description

technical field [0001] The invention belongs to the fields of environmental protection and restoration of farmland soil heavy metal pollution, and in particular relates to an in-situ restoration method for permanent removal of farmland soil heavy metals. Background technique [0002] Soil is the most active layer of the earth's surface system, the cornerstone for human survival and development, and an important material basis for ensuring the safety of human food and ecological environment. With the development of industry and the modernization of agricultural production, heavy metal pollution in soil has become one of the main problems that endanger the quality of the global environment. Heavy metal elements are potential pollutants, which are difficult to be degraded by soil microorganisms. Once they enter the soil, it is very difficult to treat them. Soil heavy metal pollution mainly comes from industrial production, agricultural production and transportation. They will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C2101/00
Inventor 丁辉叶微
Owner TIANJIN UNIV
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