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Method for preparing magnetic powder heavy metal ion blotting chitosan compound adsorbing agent

A heavy metal ion and composite adsorption technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as solid-liquid separation difficulties, achieve high selective adsorption performance, facilitate recovery and separation, and facilitate recovery and separation.

Inactive Publication Date: 2008-11-12
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of mechanical strength and the selective adsorption capacity that can improve chitosan adsorbent in waste water treatment application, solve its difficult problem of solid-liquid separation from waste water, preparation has magnetic simultaneously to imprinted metal ion Preparation method of magnetic powder heavy metal ion imprinted chitosan composite adsorbent with high selective adsorption performance, which can realize the removal and separation of Cr(VI) or Zn(II) in wastewater

Method used

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Examples

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Embodiment Construction

[0023] The following examples describe the present invention in more detail:

[0024] Take 2g of chitosan powder and add it to 10mL of 2% (w / w) acetic acid solution. After stirring for complete dissolution, add different amounts of imprinted Cr(VI) or Zn(II) (to polymerize with metal ions and chitosan). Sugars (calculated as amino groups) are measured by the ratio of the amount of substances, respectively taken as n(Cr 6+ ): n(-NH 2 )=0.3 and n(Zn 2+ ): n(-NH 2 )=0.4), mix in an Erlenmeyer flask with stopper, adjust the pH of the system to 6 with NaAc-HAc buffer solution, and oscillate at a constant temperature of 25°C for 8.0h in a constant temperature shaker to make the adsorption reach equilibrium. Then wash repeatedly with distilled water, filter with suction, wash with ethanol and ether, until the filtrate is washed with Na 2 S can not detect excess Cr(VI) or Zn(II). Then add 0.5g nano magnetic Fe 3 O 4With epichlorohydrin solution, stir evenly under constant temperature wate...

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Abstract

The present invention provides a preparation of a chitosan compound adsorbent for absorbing magnetic powder heavy metal ion imprint. The chitosan is employed as a imprinting matrix material, the nanometer magnetic powder Fe3O4 is employed as a magnetic component, the epichlorohydrin is employed as a crosslinking agent, the sodium tripolyphosphate is employed as a curing agent, after steps of ion imprinting, magnetic powder embedding and curing and template ion eliminating, the magnetic metal ion imprinting chitosan compound adsorbent is obtained. The compound absorbent prepared by the present invention can be separated from the solution after absorption efficiently and rapidly under the external magnetic field to realize the rapid efficient reclaim of the adsorbent. The compound absorbent has high mechanical strength and selective absorbability of imprint Cr(VI) or Zn (II), avoids the swelling loss of the chitosan in acidity solution and improves the absorption capacity of Cr(VI) or Zn (II). The preparation of the present invention has simple reaction conditions and has no rigorous limit of the experiment conditions. The preparation of the present invention can be used to process the heavy metal waste water containing Cr(VI) or Zn (II), also reclaim Cr(VI) or Zn (II).

Description

(1) Technical field [0001] The invention relates to a method for preparing a heavy metal adsorbent, in particular to a method for synthesizing an adsorbent that has magnetism and high selective adsorption performance for imprinted metal ions. (2) Background technology [0002] Heavy metals are one of the main pollutants in the water environment. They mainly come from electroplating, mining, metallurgy, chemical and other industries. They are potentially harmful. Toxic heavy metals or their ions are difficult to be degraded by microorganisms after entering the environment because they participate in the food chain and ultimately Accumulate in the organism, destroy the normal physiological metabolic activities of the organism, and endanger human health. In addition, with the development of industry, the use of heavy metals has become more and more widespread, resulting in a relative shortage of heavy metal resources. Therefore, how to treat heavy metal wastewater and effectively re...

Claims

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Application Information

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IPC IPC(8): B01J20/30
Inventor 任月明张密林
Owner HARBIN ENG UNIV
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