Preparation method and application of soil lead removal blocking agent

A barrier agent and soil technology, applied in the field of materials science, can solve the problems of inability to remove water-soluble lead ions, etc., and achieve the effects of high lead removal efficiency, good flocculation effect, and low lead residue

Active Publication Date: 2020-12-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects and deficiencies of the existing preparation technology, the purpose of the present invention is to provide a preparation method and application of a soil lead-removing barrier agent, which solves the problems of the prior art. The flocculant in it only has flocculation effect and cannot remove water-soluble lead ions

Method used

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  • Preparation method and application of soil lead removal blocking agent
  • Preparation method and application of soil lead removal blocking agent
  • Preparation method and application of soil lead removal blocking agent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a kind of preparation method of soil lead-removing barrier agent, comprising:

[0027] Take 100mL of 1% 4-methoxybenzamide solution, add 10% sodium hydroxide solution to the 4-methoxybenzamide solution to adjust the pH to 10 to obtain a mixed solution 1, and move the mixed solution into a condensing tube and In the three-necked bottle of the dropping funnel;

[0028] Add 6.4mL of 10% formaldehyde solution to the three-necked flask according to the molar ratio of 4-methoxybenzamide and formaldehyde of 1:0.7, put the three-necked flask into a beaker and heat it hydrothermally at 50°C for 1h to obtain mixture two;

[0029] Add 7.6mL of 10% diallylamine solution to the there-necked flask at a molar ratio of 4-methoxybenzamide to diallylamine of 1:0.84, and react for 2 hours to obtain the product soil lead-removing barrier agent. The soil lead-removing barrier obtained in this example is also called a tertiary amine type diallylamine grafted chelat...

Embodiment 2

[0036] This embodiment provides a kind of preparation method of soil lead-removing barrier agent, comprising:

[0037] Take 100mL of 1% 4-methoxybenzamide solution, add 10% sodium hydroxide solution to the 4-methoxybenzamide solution to adjust the pH to 9 to obtain a mixed solution 1, and transfer the mixed solution 1 into a condensing tube and In the three-necked bottle of the dropping funnel;

[0038] Add 6.4mL of 10% formaldehyde solution to the three-necked flask according to the molar ratio of 4-methoxybenzamide and formaldehyde of 1:0.7, put the three-necked flask into a beaker and heat it hydrothermally at 50°C for 1h to obtain mixture two;

[0039] Add 7.6mL of 10% diallylamine solution into the three-necked flask according to the molar ratio of 4-methoxybenzamide and diallylamine of 1:0.84, and react for 2h to obtain the product soil lead-removing barrier agent.

[0040] The product structure identification spectrogram and result of this embodiment are the same as t...

Embodiment 3

[0044] The preparation method of a soil lead-removing barrier agent given in this example.

[0045] The difference between this example and Example 1 is that the molar ratio of 4-methoxybenzamide, formaldehyde and diallylamine is 1:1:1, and the other conditions remain unchanged.

[0046] The soil lead removal barrier agent prepared by the preparation method of the soil lead removal barrier agent of this embodiment is used for the application of lead removal in soil, and the specific application conditions are the same as in Example 1. After conversion calculation, the soil lead removal rate is measured. 88%, recorded in Table 1.

[0047] The product structure identification spectrogram and result of this embodiment are the same as those of Example 1.

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Abstract

The invention discloses a preparation method of a soil lead removal blocking agent. The preparation method comprises the following steps: step 1, taking a 4-methoxybenzamide solution, and adjusting the pH value to 9-10 to obtain a mixed solution I; step 2, adding a formaldehyde solution into the mixed solution I to carry out hydroxymethylation reaction to obtain a mixed solution II; step 3, diallyl amine is added into the mixed solution II for a grafting reaction to obtain the soil lead removal blocking agent. Groups for capturing lead ions can be introduced into the structure of a flocculating agent, the flocculating agent has the two properties of reacting with the lead ions and flocculating at the same time, an effective practical method for removing the lead ions can be obtained. According to the preparation method, the synthesis conditions are easy to master, the lead removal efficiency is high, the lead residue amount is low, the removal rate of lead ions in soil can reach 92.0%,and the national detection requirement for lead ion pollutants in soil can be met.

Description

technical field [0001] The invention belongs to the technical field of materials science, and in particular relates to a preparation method and application of a soil lead-removing barrier agent. Background technique [0002] Lead ion is one of the common heavy metal pollutants in soil, which can cause serious ecological and environmental problems, and is extremely toxic, which is seriously harmful to human health and animal and plant growth. The accumulation of lead in the human body can cause damage to the nervous system, hematopoietic system, digestive system, liver and kidney, etc. The accumulation in plants will affect the growth of plants. With the rapid development of industry, the unreasonable application of pesticides, chemical fertilizers, etc. and sewage irrigation have led to increasingly serious soil lead ion pollution. The soil environmental quality standard GB15618-2008 stipulates that the secondary standard of total lead content in soil is: residential land i...

Claims

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Application Information

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IPC IPC(8): C07C231/12C07C237/30C09K17/14B09C1/02B09C1/08
CPCC07C231/12C07C237/30C09K17/14B09C1/02B09C1/08
Inventor 李宇亮张喆徐帅朱棋李彦宝冯雨晴
Owner CHANGAN UNIV
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