Method for preparing amphoteric cellulose by using Canadian goldenrod

A technology of amphoteric cellulose and cellulose, which is applied in chemical instruments and methods, water/sludge/sewage treatment, adsorption water/sewage treatment, etc., can solve the problem of high cost of high-pressure steam flasher and low degree of carboxymethyl substitution Stability and other issues, to achieve the effect of strong treatment and adsorption capacity, production cost protection, and simple operation

Inactive Publication Date: 2013-06-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the high-pressure steam flash exploder is expensive, and the carboxymethyl substitution degree is unstable

Method used

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  • Method for preparing amphoteric cellulose by using Canadian goldenrod
  • Method for preparing amphoteric cellulose by using Canadian goldenrod
  • Method for preparing amphoteric cellulose by using Canadian goldenrod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Crush the stalks of Solidago canadensis to 80 mesh, immerse in 17.5% sodium hydroxide solution, stir for 1 hour, soak for 24 hours, drain with vacuum filter, and then wash with distilled water until the pH is 6-8. Dry in a vacuum oven at 60°C to obtain alkali cellulose.

[0028] Put the alkali cellulose into a round bottom flask, then add 70mL of isopropanol, put it into a magnetic stirrer and stir for 20 minutes to dissolve the alkali cellulose. Add 2 drops of 40% concentrated sodium hydroxide solution dropwise to it, then add 20mL epichlorohydrin, stir and react at room temperature for 24 hours, stop the reaction, and wash the filtered cellulose with acetone, water, and acetone in sequence until pH It is 6-8.

[0029] Transfer the filtered cellulose into another round-bottomed flask, add 20mL trimethylamine aqueous solution to it, heat it in a water bath for 6 hours, stop the reaction, wash the cellulose with distilled water until the pH is 6-8, filter it with suctio...

Embodiment 2

[0032] Adsorption of hexavalent chromium on amphoteric cellulose.

[0033] Required drugs: (a) Potassium dichromate (AR), Sinopharm Chemical Reagent Co., Ltd.

[0034] (b) Diphenylcarbazide (AR), Sinopharm Chemical Reagent Co., Ltd.

[0035] Add 0.5 g of Solidago canadensis amphoteric cellulose to 250 mL of potassium dichromate solution with an initial mass concentration of 20 mg / L. After sealing with a parafilm, carry out vibration adsorption at 30°C with a shaker speed of 150r / min. After 240 minutes of adsorption, pipette 20.00ml of the solution into a small beaker, filter through a 0.45μm microporous membrane, and let stand.

[0036] Measure the remaining concentration C with a UV-visible spectrophotometer at a wavelength of 540nm t . Calculate the adsorption amount Q of Solidago canadensis amphoteric cellulose to each component at time t t and removal rate η:

[0037] Q t = ( C ...

Embodiment 3

[0041] Add 0.5 g of Solidago canadensis amphoteric cellulose to 250 mL of crystal violet and methylene blue solutions with an initial mass concentration of 500 μmol / L, respectively. After sealing with a parafilm, carry out vibration adsorption at 30°C with a shaker speed of 150r / min. After 240 minutes of adsorption, pipette 20.00ml of the solution into a small beaker, filter through a 0.45μm microporous membrane, and let stand. Use a UV-visible spectrophotometer to measure the residual concentration C at wavelengths of 590nm and 662nm respectively t .

[0042] In Example 3, amphoteric cellulose was used to treat the crystal violet solution, and the adsorption equilibrium was reached within 35-37 minutes. At this time, the concentration of crystal violet was 1.085 μmol / L, and the removal rate reached 99.7%. The methylene blue solution was treated with amphoteric cellulose, and the adsorption equilibrium was reached within 10 minutes, and the removal rate was 99%.

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Abstract

The invention relates to a method of preparing amphoteric cellulose by using Canadian goldenrod. The method comprises the following steps of: (1) crushing a stalk of the Canadian goldenrod, immersing the crushed stalk into an alkaline solution, carrying out suction filtration, then washing and drying the mixture to obtain alkaline cellulose; (2) adding the alkaline cellulose into isopropanol, adding two drops of concentrated sodium hydroxide solution and epoxy chloropropane, stirring at the room temperature to carry out reaction, and carrying out suction filtration and washing; (3) adding the treated cellulose into aqueous trimethylamine to carry out reaction, washing after the reaction, and carrying out suction filtration and drying to obtain a dry product; and (4) adding the dry product into a FeSO4 aqueous solution, uniformly stirring, adding distilled water, methacrylic acid and saturated adsorption cellulose into a mixture, bleaching the mixture after ultrasonic concussion, carrying out immersion cleaning and stirring, pumping filtering the mixture, and washing and drying to obtain the amphoteric cellulose. With the adoption of the method, the operation is simple, the production cost is saved, and the environment is also protected; and the amphoteric cellulose obtained through the method has strong treatment and adsorption capability to hexavalent chromium as a heavy metal and printing and dyeing wastewater and can be reused.

Description

technical field [0001] The invention belongs to the field of preparation of amphoteric cellulose, in particular to a method for preparing amphoteric cellulose by using Solidago canadensis. Background technique [0002] Solidago canadensis, also known as yellow warbler, Milan, happiness flower, is a perennial herb of the genus Solidago in the family Asteraceae. Native to North America, it is now an invasive plant in many parts of China and Europe. Solidago canadensis has a strong ability to reproduce and quickly occupy space. It has spread rapidly in more than ten provinces and cities in the coastal areas of my country, and has developed into a large-scale distributed and difficult-to-control harmful invasive plant. [0003] Amphoteric cellulose is a cellulose derivative synthesized by alkali fiber through carboxymethylation and quaternization reactions. Two functional groups, anionic group and cationic group, are introduced into the glucose unit structure of cellulose, whic...

Claims

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Application Information

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IPC IPC(8): C08B11/145C08B1/08C02F1/28C02F1/62
Inventor 杨再福曾钰
Owner DONGHUA UNIV
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