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Method for preparing ethylenediamine modified chitosan composite magnetic microspheres and application thereof

A composite magnetic and chitosan technology, applied in magnetic liquids, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of difficult separation and recovery of adsorbents, reduction of chitosan adsorption sites, and reduced adsorption capacity, etc. Achieving good adsorption effect, good regeneration performance and extremely high adsorption rate

Inactive Publication Date: 2011-06-01
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chitosan is a kind of biosorbent with good performance. It is the product of deacetylation of chitin. It is widely distributed in nature and can adsorb various metal ions. However, chitosan is easily soluble in acid, soft and difficult to form. Difficult and costly to recycle when applied
In order to overcome the application defects of chitosan, the direct cross-linking method is often used for modification, but due to the cross-linking agent and the -NH in the chitosan molecule 2 effect, leading to the reduction of chitosan adsorption sites and the reduction of adsorption capacity
[0004] The size of the adsorbent is another important factor affecting the adsorption performance of the adsorbent. The smaller the size of the adsorbent, the larger the specific surface, the stronger the adsorption capacity of the adsorbent, and the faster the adsorption rate, but the separation and recovery of the adsorbent are more difficult.

Method used

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  • Method for preparing ethylenediamine modified chitosan composite magnetic microspheres and application thereof
  • Method for preparing ethylenediamine modified chitosan composite magnetic microspheres and application thereof
  • Method for preparing ethylenediamine modified chitosan composite magnetic microspheres and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Weigh 40.55g of ferric chloride (or ferric sulfate and ferric nitrate of the same molar mass) to dissolve and set the volume to a 250ml volumetric flask; weigh 27.802g of ferrous sulfate heptahydrate (or ferrous sulfate monohydrate of the same molar mass, (ferrous chloride) dissolved in a 250ml volumetric flask; mix 240ml ferric chloride solution and 240ml ferrous sulfate heptahydrate solution in a 1L beaker, put the beaker in a water bath, and the temperature of the water bath is 55°C. Then adjust pH=9, stir at constant temperature (55°C) (speed 1000r / min) for 10 minutes to ensure complete reaction; raise the temperature of the water bath to 65°C, add 0.5~3ml sodium dodecylsulfonate solution (or Tween, ten Sodium hexaalkylbenzene sulfonate, sodium hexadecyl sulfate), stir for 30min; adjust pH=7 with 5% HCl; wash with water 3 times, and set the volume to about 400ml; vibrate in an ultrasonic disperser for 40min; get a concentration of about 20g / L of water-based ferrofl...

Embodiment 2

[0037]Take 100 mL of U(VI) solution with an initial concentration of 10-200 mg / L, adjust the pH to 2.5-5.5, add 0.2 g of the magnetic microspheres obtained in Example 1, and react for 20 min. After the microspheres are magnetically separated, the residual The concentration of uranium was determined by spectrophotometry, and the adsorption and removal rate of uranium was 96.7±3.1%.

Embodiment 3

[0039] Take 100 mL of Cr(VI) solution with an initial concentration of 10-200 mg / L, adjust the pH to 3.0-6.0, add 0.2 g of the magnetic microspheres obtained in Example 1, and react for 20 min. After the microspheres are magnetically separated, the residual The concentration of chromium was measured by spectrophotometry, and the adsorption and removal rate of chromium was 97.4±2.5%.

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Abstract

The invention relates to a method for preparing ethylenediamine modified chitosan composite magnetic microspheres and application thereof. The method specifically comprises the following steps of: mixing acidic aqueous solution of chitosan and a water-based magnetofluid first, then crosslinking by using glutaraldehyde, then adjusting the pH value to form a gelatinous precipitate, then modifying by using ethylenediamine and epichlorohydrin, and washing and drying to obtain a final product. The product has good absorption effect on radionuclide aranium and metal ions such as heavy metal Pb, Cr and the like; the removal rate reaches over 95 percent when the initial concentration of various ions is within the range of 200mg / L; and the product has quick absorption rate and good regeneration performance. The ethylenediamine modified chitosan composite magnetic microspheres can be used for metal recovery and pollution remediation in mines, radioactive waste water, smelteries, electronics factories and waste water of electroplating factories.

Description

technical field [0001] The invention relates to a preparation method and application of ethylenediamine-modified chitosan composite magnetic microspheres, which belong to the field of environmental functional materials and water treatment new technologies. Background technique [0002] In the treatment of heavy metal-containing wastewater and metal recovery, methods such as ion exchange, evaporation concentration, extraction, and precipitation separation are often used, which have problems such as complex process, high cost, cumbersome follow-up treatment, and secondary pollution. low efficiency. Adsorption is a promising method that can overcome many shortcomings of traditional methods. [0003] Chitosan is a kind of biosorbent with good performance. It is the product of deacetylation of chitin. It is widely distributed in nature and can adsorb various metal ions. However, chitosan is easily soluble in acid, soft and difficult to form. It is difficult and costly to recycl...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08K3/22C08B37/08C08J3/24H01F1/44B01J20/24B01J20/28B01J20/30C02F1/28C02F1/48C02F1/62
Inventor 王劲松谢水波蒋明包正垒胡新将徐华
Owner NANHUA UNIV
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