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Preparation method and application of pyridylamino composite hydrogel adsorbent

A composite hydrogel, pyridineamine-based technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of slow adsorption rate and low adsorption capacity, and achieve adsorption promotion and synthesis steps. Simple, wide-ranging effects

Inactive Publication Date: 2021-02-23
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems that existing adsorbents have extremely low adsorption capacity or slow adsorption rate in strongly acidic wastewater, the present invention provides a preparation of a pyridine amine-based composite hydrogel adsorbent that can quickly remove heavy metal cations in strongly acidic wastewater and application method

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  • Preparation method and application of pyridylamino composite hydrogel adsorbent
  • Preparation method and application of pyridylamino composite hydrogel adsorbent
  • Preparation method and application of pyridylamino composite hydrogel adsorbent

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Experimental program
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Effect test

Embodiment 1

[0039] The preparation and application of a pyridine amine-based composite hydrogel adsorbent adopts the following steps:

[0040] (a) Dissolve 2.00g of anhydrous sodium carbonate and 3.000g of 2-chloromethylpyridine hydrochloride in 50mL of deionized water successively, add 10mL of absolute ethanol, and then add 2.0g of 50wt% polyethyleneimine (PEI) Solution (MW 70000), stirred at room temperature to mix evenly, and reacted the mixed solution at 90°C for 2-8 hours to obtain a modified solution;

[0041] (b) Take 24 mL of the modified solution obtained in step (a) into a dialysis bag, and perform dialysis in deionized water. Control the volume ratio of deionized water to modified solution to 40. The water was changed every 1.5 hours, and the water was changed 4 times in total. Pour the dialyzed polymer solution into a beaker, heat and concentrate to obtain about 20 mL of PEIPD concentrate;

[0042] (c) Weigh 4.5 g of sodium alginate (SA) and dissolve it in 100 mL of deioniz...

Embodiment 2

[0045] The preparation and application of a pyridine amine-based composite hydrogel adsorbent adopts the following steps:

[0046] (a) Dissolve 2.25g of anhydrous sodium carbonate and 3.375g of 2-chloromethylpyridine hydrochloride in 50mL of deionized water successively, add 10mL of absolute ethanol, and then add 2.0g of 50wt% polyethyleneimine (PEI) solution (MW 70000), stirred at room temperature to mix well. The mixed solution was reacted at 90°C for 2 hours to obtain a modified solution;

[0047] (b) Take 24 mL of the modified solution obtained in step (a) into a dialysis bag, and perform dialysis in deionized water. Control the volume ratio of deionized water to modified solution to 40. The water was changed every 1.5 hours, and the water was changed 4 times in total. Pour the dialyzed polymer solution into a beaker, heat and concentrate to obtain about 20 mL of PEIPD concentrate;

[0048] (c) Weigh 4.5 g of sodium alginate (SA) and dissolve it in 100 mL of deionized ...

Embodiment 3

[0051] The preparation and application of a pyridine amine-based composite hydrogel adsorbent adopts the following steps:

[0052] (a) Dissolve 2.50g of anhydrous sodium carbonate and 3.750g of 2-chloromethylpyridine hydrochloride in 50mL of deionized water successively, add 10mL of absolute ethanol, and then add 2.0g of 50wt% polyethyleneimine (PEI) solution (MW 70000), stirred at room temperature to mix well. The mixed solution was reacted at 90°C for 2 hours to obtain a modified solution;

[0053] (b) Take 24 mL of the modified solution obtained in step (a) into a dialysis bag, and perform dialysis in deionized water. Control the volume ratio of deionized water to modified solution to 40. The water was changed every 1.5 hours, and the water was changed 4 times in total. Pour the dialyzed polymer solution into a beaker, heat and concentrate to obtain about 20 mL of PEIPD concentrate;

[0054] (c) Weigh 4.5 g of sodium alginate (SA) and dissolve it in 100 mL of deionized ...

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Abstract

The invention belongs to the field of environmental functional materials, and provides a preparation method and application of a pyridylamino composite hydrogel adsorbent in order to solve the problemof efficient and rapid removal of heavy metal cations in strong acid wastewater. The preparation method comprises the following steps: dissolving an acid-binding agent, an aminopyridination modification reagent and polyethyleneimine in a water-organic mixed solution, and carrying out substitution reaction to obtain a modified solution; carrying out dialysis or ultrafiltration or nanofiltration onthe modified solution to obtain a refined PEIPD solution; and uniformly mixing the PEIPD solution with a polymer solution, and carrying out cross-linking and gelation reactions to obtain the pyridylamino composite hydrogel adsorbent. The hydrogel adsorbent disclosed by the invention is low in raw material cost, simple in preparation technology and suitable for large-scale production; and by adopting the hydrogel adsorbent disclosed by the invention, the strong-acid wastewater containing heavy metals can be directly treated without adjusting the pH value, and efficient and rapid removal of various heavy metal cations such as Pb(II), Cd(II), Ni(II), Cu(II), Zn(II) and Co(II) in the strong-acid wastewater is realized.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and in particular relates to the preparation of a pyridine amine-based composite hydrogel adsorbent and its efficient removal of heavy metal cations in strongly acidic wastewater. Background technique [0002] Strongly acidic wastewater containing heavy metals (pH<3.0) is widely derived from various heavy industrial activities, including mining, metal smelting, acid leaching detoxification of heavy solid waste, non-ferrous metal pickling, etc. This type of wastewater has a large volume and complex composition. It not only contains lead, cadmium, nickel, copper and other heavy metal ions, but also may contain high concentrations of inorganic salts such as sodium sulfate and calcium chloride. Due to the low pH of this type of wastewater, most of the past projects used the neutralization sedimentation method to treat it, but this will cause some practical problems such as a large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/28047B01J20/28019B01J20/267C02F1/28C02F2101/20
Inventor 刘福强刘自成吕盈知徐晓明冯悦峰宋丽李爱民
Owner NANJING UNIV
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