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Chitosan-based composite adsorbent capable of synergistically and efficiently removing positive and negative ions of heavy metals and preparation method thereof

An anion and cation, composite adsorption technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of small adsorption capacity of heavy metal cations, complex preparation process, easy dissolution of iron ions, etc., to achieve Increase the number of adsorption sites, the preparation process is simple and effective, and the effect of improving the adsorption capacity of amphoteric

Inactive Publication Date: 2016-02-03
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the shortcomings of existing amphoteric adsorbents such as complex preparation process, low adsorption capacity, and easy to produce secondary pollution, the present invention provides a chitosan-based composite adsorbent that can synergistically and efficiently remove heavy metal anions and cations and its preparation method. Hydrated ferric oxide was embedded in chitosan matrix to prepare composite carrier, and further aiming at the problems that iron ions in chitosan-based composite adsorbent were easy to dissolve and the adsorption capacity of heavy metal cations was not large, polyethyleneimine was added to In composite adsorption, a chitosan-based composite adsorbent with stable performance and synergistically efficient removal of heavy metal anions and cations was prepared

Method used

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  • Chitosan-based composite adsorbent capable of synergistically and efficiently removing positive and negative ions of heavy metals and preparation method thereof
  • Chitosan-based composite adsorbent capable of synergistically and efficiently removing positive and negative ions of heavy metals and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A chitosan-based composite adsorbent capable of synergistically and efficiently removing heavy metal anions and cations, and its synthesis steps are:

[0033] A) Accurately weigh 3g of chitosan powder and put it into a three-necked flask filled with 100mL of distilled water, then add 2mL of acetic acid dropwise to the solution, mechanically stir at 60°C for 2h until all the chitosan is dissolved to obtain chitosan Mother liquor. Measure 30mL of chitosan mother liquor, add 0.4g of ferric sulfate and 1g of polyethyleneimine to it, stir magnetically at room temperature until uniformly mixed, and then transfer the resulting homogeneous solution to a three-necked flask, and add 0.25mL of ring to it. Oxychloropropane was initially cross-linked by magnetic stirring at 60° C. for 2 hours to obtain a mixed mother liquor.

[0034] B) Pump the mixed mother liquor into 250 mL of a coagulation bath containing 16 g of sodium hydroxide and 13 g of sodium sulfate to solidify into balls, le...

Embodiment 2

[0037] A chitosan-based composite adsorbent capable of synergistically and efficiently removing heavy metal anions and cations, and its synthesis steps are:

[0038] A) Accurately weigh 0.2g of chitosan powder and put it into a three-necked flask filled with 100mL of distilled water, then add 1mL of acetic acid dropwise to the solution, and mechanically stir at 20°C for 4h until all the chitosan is dissolved to obtain chitosan. Sugar mother liquor. Measure 30mL of chitosan mother liquor, add 0.15g of ferric sulfate and 0.3g of polyethyleneimine to it, magnetically stir at room temperature until uniformly mixed, and then transfer the resulting homogeneous solution to a three-necked flask, and add 0.15mL of The epichlorohydrin is preliminarily cross-linked by magnetic stirring at 80°C for 20 hours to obtain a mixed mother liquor.

[0039] B) Pump the mixed mother liquor into 250 mL of a coagulation bath containing 2.5 g of sodium hydroxide and 5 g of sodium sulfate to solidify into ...

Embodiment 3

[0042] A chitosan-based composite adsorbent capable of synergistically and efficiently removing heavy metal anions and cations, and its synthesis steps are:

[0043] A) Accurately weigh 5g of chitosan powder and put it into a three-necked flask filled with 100mL of distilled water, then add 8mL of acetic acid dropwise to the solution, and mechanically stir at 80°C for 10h until all the chitosan is dissolved to obtain chitosan Mother liquor. Measure 30 mL of chitosan mother liquor, add 1.8 g of ferric sulfate and 3 g of polyethyleneimine to it, magnetically stir at room temperature until uniformly mixed, and then transfer the resulting uniform solution to a three-necked flask, and add 1.20 mL of ring to it. The oxychloropropane was initially cross-linked by magnetic stirring at a temperature of 20° C. for 4 hours to obtain a mixed mother liquor.

[0044] B) Pump the mixed mother liquor into 250 mL of a coagulation bath containing 50 g of sodium hydroxide and 50 g of sodium sulfate ...

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Abstract

The invention discloses a chitosan-based composite adsorbent capable of synergistically and efficiently removing positive and negative ions of heavy metals and a preparation method thereof and belongs to the technical field of heavy metal wastewater treatment. The preparation method of the chitosan-based composite adsorbent comprises the steps that A, chitosan powder is dissolved in an acetic acid solution to form a chitosan mother solution, ferric sulfate and polyethyleneimine are put into the chitosan mother solution, uniform stirring is performed, and a mixed mother solution is obtained after preliminary crosslinking is performed by using epoxy chloropropane; B, the mixed mother solution is pumped into a coagulating bath, and composite microspheres are obtained through precipitation solidification; C, the composite microspheres are taken out and put into asodium hydroxide water solution, crosslinking is performed by using epoxy chloropropane to obtain crosslinked microspheres, and the crosslinked microspheres are washed by using distilled water till the crosslinked microspheres are neutral and then are dehydrated and saved for standby application. The chitosan-based composite adsorbent is simple in preparation, low in cost, stable in structure, superior in performance, can synergistically and efficiently remove the positive and negative ions of heavy metals and has wide application prospect on the aspect of synergistic control of combined pollutants of heavy metal positive and negative ions.

Description

Technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and more specifically, relates to a chitosan-based composite adsorbent capable of synergistically and efficiently removing heavy metal anions and cations and a preparation method thereof. Background technique [0002] Industrial wastewater, surface water and groundwater poisonous heavy metal anions (such as chromate, arsenate) and cations (such as copper, cadmium, and lead) are often mixed and coexist, all posing a serious threat to water quality and ecological health. Common technologies for reducing heavy metal pollution in water include chemical precipitation, adsorption, biological flocculation and membrane separation. Among them, the adsorption method based on high-efficiency adsorbents has become the preferred process because of the advantages of simple operation, high efficiency and reliability, reproducibility and reuse. [0003] Conventional adsorbents, ie, single-func...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/24C02F1/28C02F101/20
Inventor 刘福强朱长青张艳红朱增银韦蒙蒙陈达李爱民
Owner NANJING UNIV
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