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Heavy metal stabilizer and preparation method and use thereof

A heavy metal stabilizer and cross-linking agent technology, applied in chemical instruments and methods, water pollutants, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor Zn2+ removal ability and achieve good removal effect

Inactive Publication Date: 2019-08-09
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Visible, existing dithiocarbamate chelating agent is to Cu 2+ , Pb 2+ The removal ability of heavy metals such as Zn is better, but for Zn 2+ The removal ability is relatively poor

Method used

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  • Heavy metal stabilizer and preparation method and use thereof
  • Heavy metal stabilizer and preparation method and use thereof
  • Heavy metal stabilizer and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present embodiment provides a kind of heavy metal stabilizer, and its preparation method is as follows:

[0044] (1) Dissolve ethylenediamine (0.5mol) in deionized water at 20°C to form an aqueous solution of ethylenediamine, stir until the temperature returns to normal temperature, and set aside;

[0045] Weigh solid sodium hydroxide (1.5mol) and dissolve it in water to obtain 5mol / L lye, add it into the above-mentioned ethylenediamine aqueous solution through a constant pressure dropping funnel, after the two are fully mixed, use a constant pressure dropping funnel to slowly Add carbon disulfide (0.9mol) dropwise, and control the temperature below 30°C during the dropwise addition;

[0046] After the dropwise addition, the temperature of the system was controlled by an oil bath to 40°C, and the reaction was refluxed for 4 hours to obtain a dithiocarbamate solution;

[0047] (2) Ferrous chloride (0.15mol) solution is slowly dripped into the dithiocarbamate solutio...

Embodiment 2

[0050] The present embodiment provides a kind of heavy metal stabilizer, and its preparation method is as follows:

[0051] (1) Dissolve ethylenediamine (0.5mol) in deionized water at 20°C to form an aqueous solution of ethylenediamine, stir until the temperature returns to normal temperature, and set aside;

[0052] Weigh solid sodium hydroxide (1.5mol) and dissolve it in water to obtain 5mol / L lye, add it into the above-mentioned ethylenediamine aqueous solution through a constant pressure dropping funnel, after the two are fully mixed, use a constant pressure dropping funnel to slowly Add carbon disulfide (0.5mol) dropwise, and control the temperature below 30°C during the dropwise addition;

[0053] After the dropwise addition, the temperature of the system was controlled to 20°C by an oil bath, and the reaction was refluxed for 12 hours to obtain a dithiocarbamate solution;

[0054] (2) Ferrous chloride (0.1mol) solution is slowly dripped into the dithiocarbamate solutio...

Embodiment 3

[0057] The present embodiment provides a kind of heavy metal stabilizer, and its preparation method is as follows:

[0058] (1) Dissolve ethylenediamine (0.5mol) in deionized water at 20°C to form an aqueous solution of ethylenediamine, stir until the temperature returns to normal temperature, and set aside;

[0059] Weigh solid sodium hydroxide (1.5mol) and dissolve it in water to obtain 5mol / L lye, add it into the above-mentioned ethylenediamine aqueous solution through a constant pressure dropping funnel, after the two are fully mixed, use a constant pressure dropping funnel to slowly Add carbon disulfide (2mol) dropwise, and control the temperature below 30°C during the dropwise addition;

[0060] After the dropwise addition, the temperature of the system was controlled by an oil bath to 30°C, and the reaction was refluxed for 8 hours to obtain a dithiocarbamate solution;

[0061] (2) Ferrous chloride (0.3mol) solution is slowly dripped into the dithiocarbamate solution o...

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Abstract

The invention provides a heavy metal stabilizer and a preparation method and use thereof. The heavy metal stabilizer is prepared through the following steps that (1) small molecule polyamine and carbon disulfide react in an alkaline environment to obtain a dithiocar-bamate solution; (2) soluble iron salt and / or ferrous salt is mixed with the dithiocar-bamate solution obtained in step (1) to obtaina dithiocar-bamate solution modified by the iron salt and / or ferrous salt; (3) the dithiocar-bamate solution modified by the iron salt and / or ferrous salt obtained in step (2) and a crosslinking agent are mixed and react to form the heavy metal stabilizer. Compared with a common dithiocar-bamate polymeric chelating agent, the heavy metal stabilizer has a better removal effect on heavy metal ions,especially Zn<2+>, and has a wider pH application range.

Description

technical field [0001] The invention belongs to the technical field of heavy metal stabilization treatment, and in particular relates to a heavy metal stabilizer and its preparation method and application. Background technique [0002] Heavy metal pollution is one of the serious environmental problems. If the wastewater containing heavy metal ions enters the environment without proper treatment, since the heavy metals in it cannot be biodegraded, its pollution is difficult to remove through the self-purification effect of the environment, so it is easy to be biosorbed and enriched through the food chain, and eventually accumulate in the human body , causing serious harm to human health. Various environmental pollution incidents in the past, such as "Minamata Disease", "Itai-Itai Disease", "Rice with Excessive Cadmium", etc. were all caused by heavy metals. Therefore, the removal of heavy metal pollution has important social and environmental significance. [0003] Heavy m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/54C02F101/20
CPCC02F1/54C02F2101/20
Inventor 胡清王峰童立志胡滨马林薛然张倩李杨周雪芳
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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