Synthesis method and application of heavy metal stabilizing agent

A technology of stabilizer and synthesis method, applied in chemical instruments and methods, applications, organic chemistry, etc., can solve the problems of high toxicity, expensive raw materials, cumbersome process, etc., and achieve performance reproducibility, abundant sources, and synthetic process simple effect

Pending Publication Date: 2021-11-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above materials have good selectivity and large adsorption capacity for the target heavy metals, but the synthesis process of the above materials is cumbersome, the raw materials are expensive, and some raw materials have high toxicity to the environment and human body

Method used

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  • Synthesis method and application of heavy metal stabilizing agent
  • Synthesis method and application of heavy metal stabilizing agent
  • Synthesis method and application of heavy metal stabilizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Under the oil bath, 10.00 g of cashew phenol was added to a three-mouth flask equipped with a stirrer, a spherical condenser and a thermometer, and the temperature was heated to 40 ° C. After sufficiently melting of cashews, 1.05 g of sodium hydroxide was added, and the constant temperature was stirred for 30 min. A 7 g of a mass fraction of 37% formaldehyde aqueous solution and 50 ml DMF solution were added, and the temperature was tapered to 60 ° C, and the constant temperature was stirred for 70 min, then 2.85 g of mass fraction of 37% formaldehyde aqueous solution. 9.11 g of melamine was added, warmed to 80 ° C, and the constant temperature was stirred for 30 min, followed by cooling to 30 ° C. 4.50 g of thiourea was added in batches, warmed to 90 ° C, and the constant temperature was stirred for 9 h. After cooling, filtration was carried out, washed with acetone and deionized water, and the resulting white solid was dried in an oven at 70 ° C.

[0033] The white solid ...

Embodiment 2

[0035] Under oil bath conditions, 12.00 g of cashews were added to a three-mouth flask equipped with a stirrer, a spherical condensate and a thermometer, and the temperature was heated to 70 ° C. After sufficiently melting of cashews, 1.89 g of sodium hydroxide was added, and the constant temperature was stirred for 15 min. The 9.5 g of a mass fraction of 37% of the formaldehyde solution and 60 ml DMF solution were added, and the temperature was raised to 90 ° C, and the constant temperature was stirred for 30 min, then 4.24 g of mass fraction was 37% formaldehyde solution. 13.92 g of melamine was added, warmed to 110 ° C, and the constant temperature was stirred for 45 min, followed by cooling to 70 ° C. 6.60 g of thiourea was added batch, warmed to 125 ° C, and the constant temperature was stirred for 12 h. After cooling, filtration was carried out, washed with acetone and deionized water, and the obtained white solid was placed in an oven at an oven at 80 ° C.

[0036] The whit...

Embodiment 3

[0038] Under oil bath conditions, 10.00 g of cashew phenol was added to a three-mouth flask equipped with a stirrer, a spherical condensate and a thermometer, and heated to 60 ° C. After sufficiently melting of cashews, 1.05 g of sodium hydroxide was added, and the constant temperature was stirred for 20 min. The 7 g of the mass fraction of 37% of the formaldehyde solution and 60 ml DMF solution were added, and the temperature was raised to 90 ° C, and the constant temperature was stirred for 50 min, then 2.85 g of mass fraction of 37% formaldehyde solution was added. 9.11 g of melamine was added, warmed to 100 ° C, and the constant temperature was stirred for 40 min, followed by cooling to 45 ° C. 4.50 g of thiourea was added batch, warmed to 110 ° C, and the constant temperature was stirred for 14 h. After cooling, filtration was carried out, washed with acetone and deionized water, and the resulting white solid was dried in an oven at 100 ° C.

[0039] The white solid product w...

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Abstract

The invention discloses a synthesis method and application of a heavy metal stabilizing agent. The synthesis method comprises the following steps: heating cardanol to 40-70 DEG C, after the cardanol is fully fused, adding sodium hydroxide, and stirring at constant temperature to obtain a reaction liquid; adding a formaldehyde aqueous solution and DMF into the obtained reaction solution, heating, and stirring at a constant temperature; adding melamine into the obtained reaction liquid, after the reaction liquid is subjected to post-treatment A, slowly adding thiourea in batches, after the reaction is completed, heating to 90-125 DEG C, carrying out constant-temperature stirring reaction for 9-16 hours, and after the reaction liquid is subjected to post-treatment B, obtaining a white solid; and adding a sodium sulfite aqueous solution into the obtained white solid, heating to 90-120 DEG C, carrying out constant-temperature reflux stirring for 1.5-4 hours, and after the reaction is finished, carrying out post-treatment C on the reaction liquid to obtain a final product. The method is simple in synthesis process and mild in reaction condition, the raw material cardanol is green and easy to obtain, and the prepared compound has high selectivity on heavy metals.

Description

Technical field [0001] The present invention relates to the field of heavy metal stabilizing agents in soil heavy metal contamination treatment, and more particularly to a method and application of a heavy metal stabilizer. Background technique [0002] In recent decades, the increase in urban population and the rapid development of modern industries, soil heavy metal pollution is increasingly serious, which not only causes the ecological environment destruction, but also with organisms, ultimately endanger humanity itself. At the same time, heavy metals will have heavy metals in the migration activity, which will not only pollute the groundwater caused secondary pollution, but also increase the difficulty of soil repair. Among them, the migration activity of metal elements such as Cu, CD, and Ni is relatively small, and the migration of PB is larger than they act. Therefore, during soil repair period, the problem of PB cannot be ignored. [0003] In order to solve the threat of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/70C07D251/64C09K17/14C09K17/16
CPCC07D251/70C07D251/64C09K17/14C09K17/16
Inventor 李非里刘延年杨锋杨博轩张高翔
Owner ZHEJIANG UNIV OF TECH
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