Dendritic polymer heavy metal trapping agent with chelate-flocculation dual performance and application thereof

A heavy metal scavenger, dual-performance technology, used in flocculation/sedimentation water/sewage treatment, water pollutants, solid adsorbent liquid separation, etc. Good and other problems, to achieve the effect of not easy secondary pollution, fast deposition, fast sedimentation

Active Publication Date: 2017-07-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cost of the neutralization precipitation method is low, there are some defects: (1) Since a variety of heavy metals often coexist in the wastewater, when the amphoteric metals such as Zn, Pb, Sn, and Al are contained, it is not easy to precipitate when the pH is low, and the pH value is low. When the temperature is high, the amphoteric metals tend to redissolve, so it is necessary to accurately adjust the pH value and carry out staged precipitation treatment to ensure the best removal effect, which makes the treatment process more complicated; (2) pH control is not good, and colloids are easy to form; (3) ) the pH of the treated wastewater often reaches more than 10, and it must be neutralized before it can be discharged, and the acid-base consumption is relatively high; (4) complexed heavy metals cannot be removed, and it needs to be combined with redox method for decomplexation pretreatment; (5) ) The hydroxide precipitate produced will dissolve again with the decrease of pH value, causing secondary pollution
The polymer has a two-dimensional planar quadrilateral structure. Compared with DTC small molecule heavy metal collectors, the floc particles are large, and the flocculation and sedimentation performance is greatly improved, but the floc density is not high.

Method used

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  • Dendritic polymer heavy metal trapping agent with chelate-flocculation dual performance and application thereof
  • Dendritic polymer heavy metal trapping agent with chelate-flocculation dual performance and application thereof
  • Dendritic polymer heavy metal trapping agent with chelate-flocculation dual performance and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: Preparation of terminal dithiocarbamate group 1G polyamidoamine dendrimers

[0036] Slowly add 143.00g (20%, 0.02mol) polyamidoamine (Ethylenediamine core, 1generation, PAMAMdendrimer; M1429. 85, the following abbreviation PAMAM-(NH 2 ) 8 ) in methanol solution, cool down to 5°C, slowly dropwise add 60.91g (50%, 0.40mol) methanol solution of carbon disulfide (M76.14), control the rate of addition, make the temperature of the reaction mixture 8 ), M2018.97), the yield is 99.95%, indicating that the terminal amino group (with -NH 2 The molar ratio of carbon disulfide to the carbon disulfide participating in the reaction is (-NH 2 ):(CS 2 )=1:1. The mother liquor is methanol and unreacted carbon disulfide, which can be reused.

[0037] The resulting PAMAM-(NHCSSH) 8 Add a four-necked flask, then add 35.00g of water, 16.00g (40%, 0.16mol) of sodium hydroxide solution, and react for 2 hours at 50°C to obtain a solid content of about 50% terminal dithiocar...

Embodiment 2

[0040] Example 2: Preparation of terminal dithiocarbamate group 2G polyamidoamine dendrimers

[0041] Slowly add 162.81g (20%, 0.01mol) of the 2nd generation polyamidoamine (Ethylenediamine core, 2generation, PAMAMdendrimer; M3256. 18, the following abbreviation PAMAM-(NH 2 ) 16 ) in methanol solution, cool down to 5°C, slowly dropwise add 73.09g (50%, 0.48mol) methanol solution of carbon disulfide (M76.14), control the rate of addition, make the temperature of the reaction mixture 16 ), M4474.42), yield 99.93%. The mother liquor is a mixed solution of methanol and unreacted carbon disulfide, which can be reused.

[0042] The obtained intermediate PAMAM-(NHCSSH) 16 Add all to the four-necked flask, add 42.00g of water, 16.00g (40%, 0.16mol) of sodium hydroxide solution, and react for 2 hours at 50°C to obtain a solid content of about 50% terminal dithiocarbamate group Polyamidoamine (as PAMAM-(DTC) 16 express).

[0043] The resulting PAMAM-(DTC) 16 The NMR spectrum ( 1...

Embodiment 3

[0045] Embodiment 3: Treatment of circuit board heavy metal wastewater

[0046] A circuit board wastewater: pH 2.6, Cu 2+ 165.282mg·L -1 、Ni 2+ 101.395mg·L -1 , add the heavy metal trapping agent of embodiment 1, 2 and comparative example, stir 5min, precipitate 5min, filter, measure heavy metal concentration, the results are shown in Table 1.

[0047] The results showed that the dosage of 200mg·L -1 When, the PAMAM-(DTC) of embodiment 1,2 of the present invention 8 、PAMAM-(DTC) 16 , can meet the emission requirements of "Copper, Cobalt, Nickel Industrial Pollution Source Discharge Standard (GB25467-2010)" and "Urban Comprehensive Sewage Discharge Standard (GB18918-2002)", while the comparison PAMAM-(DTC) 4 is not reached. Comparative example PAMAM-(DTC) 4 Need 250mg·L -1 It can meet the requirements of "Discharge Standards for Copper, Cobalt and Nickel Industrial Pollution Sources (GB25467-2010)", but cannot meet the requirements of "Urban Comprehensive Sewage Discha...

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Abstract

The invention relates to a dendritic polymer heavy metal trapping agent with chelate-flocculation dual performance and application thereof. The heavy metal trapping agent is a terminal dithiocarbamate-amine dendritic polymer which is prepared by reacting polyamide-amine dendritic polymer (shown as PAMAM-(NH2)8G, wherein G is algebra) with algebra G from 1 to 3 with carbon disulfide. Due to the special three-dimensional space structure, suitable molecular weight and high-density terminal chelate group dithiocarbamic acid, the terminal dithiocarbamate-amine dendritic polymer not only has ultrahigh chelating capacity with heavy metal ion but also has large volume, quick settling and easiness in separation of the deposition flocculation formed after chelating with heavy metal and has efficient property of chelating and flocculating with the heavy metal.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a dendritic polymer heavy metal trapping agent with dual properties of chelation and flocculation and its application. The heavy metal trapping agent is a terminal chelating group dithiocarbamate A terminal dithiocarbamate-based polyamide-amine dendritic polymer with a salt number of 8G (G is a generation number, G≠0, G=1-3). Background technique [0002] Heavy metal wastewater treatment methods mainly include chemical precipitation method, ion exchange method, reverse osmosis method, and activated carbon adsorption method. Among them, chemical precipitation method is relatively low in cost, relatively simple in process, and relatively mature in technology, so it is the most widely used. [0003] Traditional chemical precipitation methods mainly include neutralization precipitation and sulfide precipitation. [0004] The neutralization precipitation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F101/20
CPCC02F1/56C02F2101/20C08G83/005B01D15/38C02F1/683B01D21/01B01D2257/60C08G83/004
Inventor 张冰如李风亭王颖于小新王焰伍春柔
Owner TONGJI UNIV
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