Polyethyleneimine-chitosan adsorbent one-step synthesis method

A technology of polyethylenimine and chitosan, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of small single treatment volume, high treatment cost and poor treatment effect Inadequate and other problems, to achieve the effect of stable and effective adsorption performance, simple and reliable preparation method

Active Publication Date: 2016-03-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Energy and chemical industry wastewater often contains complex components such as heavy metal ions (such as copper, cobalt, manganese), azo dyes (such as methyl orange), strong acid and strong alkali, and existing wastewater ...

Method used

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  • Polyethyleneimine-chitosan adsorbent one-step synthesis method
  • Polyethyleneimine-chitosan adsorbent one-step synthesis method
  • Polyethyleneimine-chitosan adsorbent one-step synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Adsorption of different initial concentrations of methyl orange dyes using polyethyleneimine-chitosan adsorbents

[0049] Preparation of polyethyleneimine-chitosan adsorbent:

[0050] Step 1: 2 parts by weight of chitosan, 30% polyethyleneimine of 3 parts by weight and glacial acetic acid of 2 parts by weight were slowly stirred for 6 hours in a water bath at 50°C until uniformly mixed to obtain an internal phase; , mixing liquid paraffin and petroleum ether in a volume ratio of 7:5, and adding 2 parts by weight of Span 80 (purchased from Sinopharm Chemical Reagent Co., Ltd.), fully mixed to obtain the external phase;

[0051] Step 2: using the external syringe pump system to pass the internal phase and the external phase into the focused flow microfluidic chip respectively according to the flow rate ratio of 1:7, to obtain chitosan droplets;

[0052] Step 3: After the chitosan droplet that obtains in step 2 is stable, pass into the cross-linking solidific...

Embodiment 2

[0059] Embodiment 2: Utilize polyethyleneimine-chitosan adsorbent to adsorb acidic and alkaline solutions with different pH values

[0060] Preparation of polyethyleneimine-chitosan adsorbent:

[0061] The polyethyleneimine-chitosan adsorbent was prepared according to the method described in Example 1.

[0062] Adsorption of acidic and alkaline solutions with different pH values:

[0063] Dilute hydrochloric acid solutions with pH values ​​of 3, 4, and 5 were prepared, transferred to a 30 mL straight screw-shaped glass bottle, and 0.1 mL of an acid indicator (0.1% methyl orange solution) was added thereto.

[0064] Sodium hydroxide solutions with pH values ​​of 8, 9, and 10 were prepared, transferred to a 30 mL straight glass bottle with a screw top, and 0.1 mL of an alkaline indicator (0.5% phenolphthalein solution) was added thereto.

[0065] Weigh 0.01g of polyethylenimine-chitosan adsorbent and add it into straight glass bottles with different pH values ​​of acidic and...

Embodiment 3

[0071] Embodiment 3: Utilize polyethyleneimine-chitosan adsorbent to adsorb copper ions in copper sulfate solution

[0072] Preparation of polyethyleneimine-chitosan adsorbent:

[0073] The polyethyleneimine-chitosan adsorbent was prepared according to the method described in Example 1.

[0074] Adsorption of copper ions in copper sulfate solution:

[0075] Weigh 0.1 g of polyethyleneimine-chitosan adsorbent and add it to 50 mL of copper sulfate solution with initial pH value of 5 and copper ion concentration of 100 ppm. And in a test tube mixer at a vibration frequency of 800min -1 And vibration amplitude 8mm continuous vibration. Every 10 minutes, take 2mL of copper sulfate solution, and use full-spectrum direct-reading plasma emission spectrometer to measure it. Finally, it was measured that the polyethyleneimine-chitosan adsorbent reached adsorption equilibrium after 80 minutes, the copper ion concentration at this time was 11.08ppm, and the adsorption efficiency was...

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Abstract

The invention relates to a polyethyleneimine-chitosan adsorbent one-step synthesis method. The method comprises the following steps: firstly, chitosan, polyethyleneimine and glacial acetic acid are prepared into an inner phase solution, and liquid paraffin and petroleum ether are prepared into an outer phase solution; secondly, the inner phase solution and the outer phase solution obtained the first step are injected into a focal flow-type micro-fluidic chip, a series of chitosan liquid drops are prepared; thirdly, when the chitosan liquid drops in the second step are generated stably, the chitosan liquid drops are introduced into a crosslinking solidification liquid, and chitosan microspheres are prepared; fourthly, the chitosan microspheres obtained in the third step are cleaned for many times in an ethanol solution, an acetone solution and deionized water in order; fifthly, the chitosan microspheres obtained in the fourth step are subjected to freeze-drying, and a polyethyleneimine-chitosan adsorbent is obtained.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a one-step synthesis method of polyethyleneimine-chitosan adsorbent. Background technique [0002] Energy and chemical industry wastewater often contains complex components such as heavy metal ions (such as copper, cobalt, manganese), azo dyes (such as methyl orange), strong acid and strong alkali, and existing wastewater treatment methods, such as neutralization and reduction methods , vulcanization method, etc., are faced with problems such as small single treatment volume, long treatment cycle, poor treatment effect, high treatment cost, and secondary pollution. [0003] Therefore, there are more and more calls for efficient wastewater treatment methods with simple and effective treatment methods, short treatment periods, low treatment costs, and no secondary pollution to the environment. Contents of the invention [0004] Aiming at problems such as complex components ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J20/267B01J20/3085B01J2220/4812C02F1/288C02F2101/20C02F2101/38
Inventor 白志山王炳捷朱勇赵双良马巍杨晓勇罗会清
Owner EAST CHINA UNIV OF SCI & TECH
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