Heavy metal chelating agent with dendritic Dendrimer molecular structure as well as preparation method and application of heavy metal chelating agent

A heavy metal chelating agent, molecular structure technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc. Unfavorable, low chelation efficiency and other problems, to achieve the effect of difficult separation, high chelation efficiency, and efficient chelation

Pending Publication Date: 2022-04-12
神美科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] For this reason, the heavy metal chelating agent that possesses dendrimer molecular structure, polythiocarbamate functional group and preparation method thereof provided by the present invention solves the problem of the presence of complex sulfur in the heavy metal fly ash chelating agent widely used in the prior art. The density of functional groups is relatively low, its small molecule and comb-shaped linear molecular structure, and its spatial configuration are not conducive to the formation of a stable chelation coordination structure, low chelation efficiency, and the analysis of heavy metal ions that are easily affected by factors such as pH Separation and other issues, and at the same time, it also has an efficient chelation effect on heavy metals in sewage and wastewater

Method used

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  • Heavy metal chelating agent with dendritic Dendrimer molecular structure as well as preparation method and application of heavy metal chelating agent
  • Heavy metal chelating agent with dendritic Dendrimer molecular structure as well as preparation method and application of heavy metal chelating agent
  • Heavy metal chelating agent with dendritic Dendrimer molecular structure as well as preparation method and application of heavy metal chelating agent

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preparation example Construction

[0054] The preparation method of heavy metal chelating agent of the present invention may further comprise the steps:

[0055] S1: Preparation of Dendrimer Multi-branch Molecular Structure Core

[0056] Using cyanuric chloride and ethylenediamine as raw materials, polyamine PA with a dendritic Dendrimer multi-branched structure was synthesized as the core of the molecular structure by repeating the addition reaction in sequence.

[0057] Synthetic route ①: Grafting melamine with ethylenediamine as the basis of the initial molecular structure

[0058] Synthesis of 0.5 generation / Generation Dendrimer multi-branched polyamine PA:

[0059] Place the reaction vessel equipped with a stirrer, condenser, thermometer and constant pressure dropping funnel in an ice-water bath, add a certain amount of solvent and a set amount of melamine into the reaction vessel, stir until dissolved, and then add a certain amount of The amount of catalytic acid-binding agent is mixed evenly, and the p...

Embodiment 1

[0105] Referring to the above preparation method, according to the synthetic route ①: ethylenediamine was used as the initial molecular structure to graft melamine for generation-by-generation addition reaction, and the 1.0th generation polyamine PA with dendritic Dendrimer multi-branched structure was synthesized as the molecule structural core. The reaction route is: the molar ratio of initial ethylenediamine and melamine is 1:4; the molar ratio of 0.5 generation polyamine PA and ethylenediamine is 1:8.

[0106] The whole generation 1.0 Generation polyamine PA is used as the core of the molecular structure, and reacted with strong lye and carbon disulfide to prepare a multi-branched dithiocarbamate-type heavy metal chelating agent. According to the molar ratio of PAG-1.0, carbon disulfide and sodium hydroxide of 1:24:24, the heavy metal chelating agent is prepared by carrying out the synthesis reaction.

Embodiment 2

[0108] Referring to the above preparation method, according to the synthetic route ①: ethylenediamine was used as the initial molecular structure to graft melamine for generation-by-generation addition reaction, and the 1.0th generation polyamine PA with dendritic Dendrimer multi-branched structure was synthesized as the molecule structural core. The reaction route is that the molar ratio of the initial reaction between ethylenediamine and melamine is 1:4; the molar ratio of the reaction between 0.5 generation polyamine PA and ethylenediamine is 1:8.

[0109] The whole generation 1.0 Generation polyamine PA is used as the core of the molecular structure, and reacted with strong lye and carbon disulfide to prepare a multi-branched dithiocarbamate-type heavy metal chelating agent. According to the molar ratio of PAG-1.0, carbon disulfide, and sodium hydroxide of 1:12:12, the heavy metal chelating agent is prepared by carrying out the synthesis reaction.

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Abstract

The invention provides a heavy metal chelating agent with a dendritic Dendrimer molecular structure as well as a preparation method and application of the heavy metal chelating agent. The heavy metal chelating agent is provided with a molecular cavity with a six-membered ring structure and a branched chain winding structure which are formed by taking polyamine PA as a molecular structure core and grafting a plurality of groups of dithiocarbamate functional groups on a molecular branched chain and a tail end. The efficient chelating effect between molecules and heavy metal is achieved through the space molecule structure and the star-shaped cavity structure of the metal chelating agent, the heavy metal in waste water and industrial solid waste is efficiently captured and chelated, stable flocculation / sediment is formed, and the heavy metal is not prone to being decomposed and separated out. Compared with existing comb-shaped, linear and small-molecular dithiocarbamate DTC heavy metal chelating agents, the heavy metal chelating agent has the advantages of more excellent molecular space structure, higher heavy metal chelating capacity and stability, high efficiency, good PH applicability and the like, the heavy metal chelating efficiency can be effectively improved, and the risk of secondary pollution can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of heavy metal treatment of water, waste water, sewage, sludge or solid waste, and specifically relates to a heavy metal chelating agent with a dendrimer molecular structure, a preparation method and an application thereof. Background technique [0002] With the development of the economy, the use of metal materials has increased sharply, and the heavy metal pollution produced in the production process of mining, smelting, machinery manufacturing, chemical industry, electronics, instrumentation, garbage and solid waste incineration disposal has become more and more serious. Affect the environment, human and biological health and survival. Heavy metal pollution refers to the environmental pollution caused by heavy metals such as mercury, lead, arsenic, cadmium, chromium, copper, cobalt and their compounds with obvious biological toxicity. Heavy metal pollution cannot be decomposed and degraded by the environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C02F1/56C02F101/20
Inventor 周继柱冯春晖柯建怡马凯李雁鸿孙松厚王国瑞冯嵩石伟杰
Owner 神美科技有限公司
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