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Novel method for fast removing cupric ion with magnetic sorbent

A magnetic adsorbent, copper removal technology, applied in chemical instruments and methods, adsorption water/sewage treatment, magnetic field/electric field water/sewage treatment, etc., can solve the problems of cumbersome operation, low removal rate and high cost, and achieve simple equipment , mild reaction, short time-consuming, easy operation

Inactive Publication Date: 2008-10-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the methods of industrial treatment of copper-containing wastewater mainly include chemical coagulation precipitation, ion exchange, electrolysis, reverse osmosis, electrodialysis, etc. However, these methods have high cost, low removal rate, cumbersome operation, and energy consumption. Large and other shortcomings

Method used

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  • Novel method for fast removing cupric ion with magnetic sorbent
  • Novel method for fast removing cupric ion with magnetic sorbent
  • Novel method for fast removing cupric ion with magnetic sorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of the nano-magnetic particles wrapped with chitosan, the specific steps are as follows:

[0031] At 50°C, chitosan was dissolved with acetic acid solution (25wt.%) to prepare a 16wt.% chitosan solution.

[0032] 10ml Fe 3 o 4 Add 1ml of Span-80 into the solution, then pour the above-mentioned chitosan solution into it, and stir at 1000r / min for 15min. Then ultrasonically oscillate for 30 min, and then stir for 30 min at 1000 r / min.

[0033] In the presence of a magnetic field, wash with distilled water three times to complete the sedimentation process and collect magnetic nanoparticles.

Embodiment 2

[0035] The preparation of the magnetic nano-adsorbent with α-ketoglutaric acid as the surface modifier, the specific steps are as follows:

[0036] The nano-magnetic particles coated with chitosan are swelled with an acetic acid buffer solution with pH=5.6.

[0037] Add 0.25g α-ketoglutaric acid to the above solution, adjust the pH value to 4.5~5.0 with 5mol / l NaOH, then slowly add 0.15g NaBH 4 , adjust the pH value to 6.5-7.0 with 15wt.% HCl, and react for 24h.

[0038] Wash three times with 100wt.% ethanol and anhydrous ether respectively.

Embodiment 3

[0040] Removal of Cu by the prepared magnetic nanoadsorbent 2+ The adsorption experiment, the specific steps are as follows:

[0041] At 22°C and 100rpm, mix 50mg of magnetic nanosorbent with 10ml of a certain concentration of CuSO 4 The solutions were mixed and reacted for 4h.

[0042] Under the action of an external magnetic field, the fully reacted magnetic nano-adsorbent is separated from the reaction solution.

[0043] With 25mmol / L EDTA as a chelating agent, measure the remaining CuSO in the reaction solution with a UV spectrophotometer at a wavelength of 740nm 4 Concentration, calculated for CuSO adsorbed on 4 quantity.

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Abstract

The invention relates to a method for fast removing metal copper ions in waste water by a magnetic adsorbent, which comprises steps that: (1) a chitosan solution with the mass fraction of 16 percent is used to wrap a Fe3O4 magnetic powder to prepare magnetic nanometer particles; (2) an acetic acid buffer solution with a pH value of 5.6 is used for swelling the magnetic nanometer particles and carrying out the surface chemical modification so as to prepare a novel magnetic adsorbent; (3) a magnetic nano-adsorber of 10-120mg is used for adsorbing a copper ion solution with the volume of 10ml and concentration of 40-800ppm at a temperature of 22 DEG C and a speed of 100rpm, and the solution undergoes the elution by an eluant with the volume of 20ml and concentration of 100mmol / L, thereby obtaining the regenerative magnetic nano-adsorber; and (4) the adsorption conditions of the magnetic nano-adsorber are optimized through adjusting the adsorption conditions. The method has advantages of simple and convenient operation, short time consumption, allowing fast feeding, convenient and rapid elution and strong regenerative power.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for quickly and efficiently removing metal copper ions in wastewater by a novel magnetic adsorbent. Background technique [0002] Copper is a valuable metal, which is the first subgroup element in the periodic system, and its application range is very wide. It also plays an extremely important role in life. Natural water contains very little copper. The copper in water is mainly caused by the pollution of industrial wastewater, mainly from electroplating, smelting, hardware, chemical industry, mining and other departments. [0003] Copper in water cannot be decomposed by microorganisms, on the contrary, organisms can enrich it and convert it into more toxic heavy metal organic compounds. Copper has a serious impact on the self-purification of water bodies. In a complex water environment, if copper enters the water, it will easily cause water pollution. For exa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/64C02F1/48
Inventor 朱利民周毓婷聂华丽何智妍
Owner DONGHUA UNIV
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