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Preparation method of ternary polymer molecular brushes heavy metal capture agent

A heavy metal scavenger, ternary polymer technology, applied in chemical instruments and methods, water pollutants, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of low removal efficiency, incomplete precipitation, and small precipitated particles. , to achieve the effect of good stability, not easy to secondary pollution, not easy to decompose

Active Publication Date: 2017-03-01
SHUNDE POLYTECHNIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the first generation of heavy metal scavenger products, DTC derivatives are the most widely used products, but there is a defect that the generated precipitates are easy to decompose and have poor stability, resulting in secondary pollution problems
Tripolythiocyanate (TMT), as the second-generation heavy metal scavenger product, is also widely used in industrial wastewater treatment. Tripolythiocyanate contains three mercapto groups that can precipitate most heavy metal ions, but the precipitation is incomplete and the removal efficiency low level problem
The main problem of small molecular polysulfide compounds is that the precipitated particles generated are small, usually nano-scale precipitates, which are difficult to effectively separate and precipitate from industrial wastewater. Only by adding a large amount of polymer flocculant can sedimentation and separation be effective.

Method used

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  • Preparation method of ternary polymer molecular brushes heavy metal capture agent
  • Preparation method of ternary polymer molecular brushes heavy metal capture agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] It is a ternary polymer molecular brush polysulfide polymer, which is prepared by the following steps:

[0035] Step 1 P(GMA-N 3 ) Synthesis of polymer backbone A

[0036] Take 1 part of ethyl 2-bromoisobutyrate initiator, 800 parts of glycidyl methacrylate (GMA), 1000 parts of diphenyl ether, 5 parts of CuBr and 5 parts of N,N,N', N',N"-pentamethyldiethylenetriamine (PMDETA), ATRP reaction was carried out at 30°C under nitrogen protection for 5 hours to obtain polyglycidyl methacrylate (PGMA) with a degree of polymerization (DP) of 700;

[0037] Take 100 parts of PGMA (DP=700), 200 parts of NaN 3 and 300 parts of dimethylformamide (DMF), reacted at 60°C for 50 hours to obtain P(GMA-N 3 ), as the polymer backbone A.

[0038] Step 2 Synthesis of three side chains

[0039] Synthesis of hydrophilic polymer side chain C: Take 50 parts of monomethoxypolyethylene glycol (Mn=5000), 10 parts of 2-propynylacetic acid, and 10 parts of 4-dimethylaminopyridine (DMAP) , 10 par...

Embodiment 2

[0048] Preparation method and raw material composition are all the same as embodiment one, only polymer main chain A and polysulfide polymer side of ternary polymer molecular brush PGMA-g-(PDNTEMA-r-PEG-r-PAM) of embodiment one By adjusting the polymerization degree of chain B, heavy metal scavenger with different particle sizes can be prepared. The degree of polymerization of the polymer main chain A and the polysulfide polymer side chain B, and the particle size of the heavy metal scavenger are shown in Table 1.

[0049] The degree of polymerization of the polymer main chain A is 550, 650, 850, 900, 1000 The degree of polymerization of the polymer and the side chain B of the polysulfide polymer is 50, 100, 150, 200, and the degree of polymerization of the hydrophilic side chain C is 114 and the degree of polymerization of the flocculated side chain D is 120. It can be prepared according to the method of Example 1 by controlling the raw materials or the polymerization reacti...

Embodiment 3

[0054] The preparation method and raw material composition are the same as in Example 1, only the grafting ratio of the hydrophilic polymer side chain C and the flocculation polymer side chain D of the ternary polymer molecular brush of Example 1 is changed, that is, the relative molar percentage of each side chain , heavy metal scavengers with different sedimentation rates can be prepared. Sedimentation rate test conditions: Cu at 20 mg / L 2+ 500 mL of ions was used as the test solution, and 1.0 mL of heavy metal scavenger was added to observe the change of sedimentation. The timing was started when the heavy metal scavenger was put in. When a large precipitation was observed, it was the sedimentation time. See Table 2 for the change of sedimentation time.

[0055] Table 2: Effect of molecular brush side chain composition on precipitation time of heavy metal scavenger

[0056]

[0057] It can be seen from Table 2 that heavy metal scavenger with different sedimentation rate...

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Abstract

The invention relates to a preparation method of a ternary polymer molecular brushes heavy metal capture agent. The preparation method is characterized by comprising the following steps: dissolving 5-10 parts of ternary polymer molecular brushes in 10-50 parts of water; and stirring at 20-30 DEG C for 1-10 h to obtain a nanometer heavy metal capture agent micellar solution. The ternary polymer molecular brushes contain multi-sulfur polymer and flocculation polymer simultaneously. Each molecular chain can provide hundreds of coordination sites to carry out coordination crosslinking with heavy metal ions so as to generate micron-level aggregate. Under the action of the flocculation polymer, millimeter level and above of aggregate is rapidly generated and is rapidly deposited and separated from the water body. The generated aggregate has good stability, is not easy to decompose, and is not easy to generate secondary pollution.

Description

technical field [0001] The invention belongs to the field of water treatment technology and polymer functional materials, and in particular relates to a preparation method of a ternary polymer molecular brush heavy metal scavenger. Background technique [0002] Heavy metal ion scavenger is an organic compound with chelating functional groups, which can selectively capture, separate and precipitate heavy metals from solutions containing metal ions. At present, the heavy metal scavengers that are widely used mainly include dithiocarbamate derivatives (DTC), tripolythiocyanate (TMT), and small molecular polysulfide compounds. As the first generation of heavy metal scavenger products, DTC derivatives are the most widely used products, but there is a defect that the generated precipitates are easy to decompose and have poor stability, resulting in secondary pollution problems. Tripolythiocyanate (TMT), as the second-generation heavy metal scavenger product, is also widely used i...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08G81/02
CPCC02F1/56C02F2101/20C08G81/025
Inventor 刘锋李为山陈雪怡彭琦霍应鹏路风辉陈燕舞
Owner SHUNDE POLYTECHNIC
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