Preparation method and application of soil cadmium removal blocking agent

A barrier agent and soil technology, applied in the field of materials science, can solve the problem of inability to remove water-soluble cadmium ions, and achieve the effects of high cadmium removal efficiency, good effect, and easy to master synthesis conditions.

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

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Problems solved by technology

[0004] Aiming at 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 cadmium removal barrier, which solves the problem that the flocculants in the prior art only have flocculation and cannot remove water-soluble cadmium ions The problem

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

Examples

Experimental program
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Embodiment 1

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

[0027] Take 1.58g of polyacrylamide gel and add it to 100ml of distilled water, add 10% hydrochloric acid solution to adjust the pH to 1-2 to obtain a mixed solution 1, and transfer the mixed solution 1 into a three-necked flask;

[0028] Add 1.87mL of 10% formaldehyde solution into the three-necked flask according to the mass ratio of polyacrylamide and formaldehyde solution of 1:0.22, put the three-necked flask into a beaker and heat it hydrothermally at 25°C for 120min to obtain the mixed solution II;

[0029] Add 10mL of 0.36g / mL 2-chlorobenzylamine solution to the there-necked flask according to the mass ratio of polyacrylamide and 2-chlorobenzylamine solution at a ratio of 1:2.28, and react for 120min to obtain the product soil cadmium-removing barrier agent. This implementation The soil cadmium removal barrier agent in the example is also called 2-chloroben...

Embodiment 2

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

[0037] Take 1.58g of polyacrylamide gel and add it to 100ml of distilled water, add 10% hydrochloric acid solution to adjust the pH to 1-2 to obtain a mixed solution 1, and transfer the mixed solution 1 into a three-necked flask;

[0038] Add 1.275mL of 10% formaldehyde solution into the three-neck flask according to the mass ratio of polyacrylamide and formaldehyde solution of 1:0.15, put the three-necked flask into a beaker and heat it hydrothermally at 25°C for 120min to obtain the mixed solution II;

[0039] Add 8.77mL of 0.36g / mL 2-chlorobenzylamine solution into the three-necked flask according to the mass ratio of polyacrylamide and 2-chlorobenzylamine solution at a ratio of 1:2, and react for 120min to obtain the product soil cadmium removal barrier.

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

Embodiment 3

[0043] This embodiment provides a kind of preparation method of soil cadmium-removing barrier agent, comprising:

[0044] Take 1.58g of polyacrylamide gel and add it to 100ml of distilled water, add 10% hydrochloric acid solution to adjust the pH to 1-2 to obtain a mixed solution 1, and transfer the mixed solution 1 into a three-necked flask;

[0045]Add 2.55mL of 10% formaldehyde solution into the three-neck flask according to the mass ratio of polyacrylamide and formaldehyde solution of 1:0.3, put the three-necked flask into a beaker and heat it hydrothermally at 25°C for 120min to obtain the mixed solution II;

[0046] Add 11.0mL of 0.36g / mL 2-chlorobenzylamine solution into the three-neck flask according to the mass ratio of polyacrylamide and 2-chlorobenzylamine solution of 1:2.5, and react for 120min to obtain the product soil cadmium removal barrier.

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

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Abstract

The invention discloses a preparation method of a soil cadmium removal blocking agent, which comprises the following steps: 1, adding polyacrylamide gel into distilled water, and regulating the pH value to 1-2 to obtain a mixed solution I; 2, adding a formaldehyde solution into the mixed solution I to carry out hydroxymethylation reaction to obtain a mixed solution II; and 3, adding a 2-chlorobenzylamine solution into the mixed solution II, and carrying out a grafting reaction to obtain the soil cadmium removal blocking agent. The soil cadmium removal blocking agent provided by the invention can introduce groups for capturing cadmium ions into a flocculating agent structure, so that the flocculating agent has two properties of reacting with the cadmium ions and flocculating at the same time, and a practical method for effectively removing the cadmium ions can be obtained. According to the preparation method, the synthesis conditions are easy to master, the cadmium removal efficiency ishigh, the residual amount of cadmium is low, the removal rate of cadmium ions in soil can reach 99.8%, and the national detection requirement for cadmium 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 barrier agent for removing cadmium from soil. Background technique [0002] Since the discovery of cadmium ions in the early 20th century, the output has increased year by year, and it is one of the common heavy metal pollutants in soil. A large amount of cadmium is discharged through waste gas, waste water, and waste residue, causing serious ecological and environmental problems. The accumulation of cadmium in the human body can cause kidney failure, arthritis, cancer and other diseases, and the accumulation in plants will affect the growth of plants. The World Health Organization stipulates that the maximum allowable intake of cadmium in the human body is 1 μg.kg -1 .d -1 . However, with the rapid development of industry, the unreasonable discharge of industrial wastewater such as mining and metallurgy, the app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/18
CPCC09K17/18
Inventor 李宇亮张喆徐帅朱棋马成李彦宝周雪佩
Owner CHANGAN UNIV
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