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Cellulose magnetic microspheres prepared by improving reaction activity of eucalyptus fibers as well as preparation method and application of cellulose magnetic microspheres

A technology of magnetic microspheres and reactivity, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve problems such as poor distribution of magnetic nanoparticles and poor cellulose reactivity

Pending Publication Date: 2021-05-11
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation of magnetic cellulose nanocomposites, there are often situations such as poor cellulose reactivity and poor distribution of magnetic nanoparticles in the product.

Method used

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  • Cellulose magnetic microspheres prepared by improving reaction activity of eucalyptus fibers as well as preparation method and application of cellulose magnetic microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take 30 g of dry eucalyptus fiber, add deionized water to prepare a wet slurry with a mass concentration of 10%, put the wet slurry into a PFI refiner for mechanical beating, and obtain a beating slurry. The beating conditions are beating gap 0.20mm, beating pressure 33.3N cm -1 , The beating speed is 1500rpm, and the beating degree is 70000r.

[0028] (2) Take 1.0g of the beating slurry and add it to 50mL of 9wt% sodium hydroxide aqueous solution, stir to make it evenly mixed, place it at -10°C for 9 hours of freezing and low temperature treatment, take it out and thaw it at room temperature, and then slowly drop it into 1mol L -1 hydrochloric acid to regenerate and precipitate the cellulose, wash to neutral, dehydrate and dry to obtain active eucalyptus fiber.

[0029] After the eucalyptus fiber is treated with the above-mentioned PFI refiner and lye, the original dense fiber structure is destroyed, the cellulose structure becomes loose, and its specific surface...

Embodiment 2

[0036] Compared with Example 1, the difference of Example 2 is that in the step (4), the autoclave was reacted at a temperature of 180° C. for 7 hours, and the rest of the operations were the same as in Example 1. It is measured that the adsorption rate of cellulose magnetic microspheres to methylene blue is 93%

Embodiment 3

[0038] Compared with Example 1, the difference of Example 2 is that in the step (4), the autoclave was reacted at a temperature of 180° C. for 8 hours, and the rest of the operations were the same as in Example 1. It is measured that the adsorption rate of the cellulose magnetic microsphere product to methylene blue is 99%. And the methylene blue adsorption rate is still as high as 98% when it is recycled for the third time; the adsorption rate drops significantly when it is used for the fourth time, but it can keep the adsorption rate above 91% when it is used for 5 times.

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Abstract

The invention discloses cellulose magnetic microspheres prepared by improving reaction activity of eucalyptus fibers and a preparation method of the cellulose magnetic microspheres, and the preparation method comprises the following steps: dispersing the eucalyptus fibers in water to form wet slurry, then performing mechanical pulping to obtain pulping slurry, then dispersing the pulping slurry in alkali liquor, performing freezing treatment, performing unfreezing, then adding acid liquor to separate out the eucalyptus fibers, and after filtering, washing with water, dehydrating and drying to obtain active eucalyptus fibers; dissolving active eucalyptus fibers in a NaOH-urea solvent to obtain a cellulose solution, and dropwise adding the cellulose solution into a coagulating bath to obtain cellulose microspheres; adding iron salt into ethylene glycol, adding sodium acetate and ethylenediamine, uniformly mixing, adding cellulose microspheres, stirring, transferring the mixture into a high-pressure reaction kettle, and reacting at high temperature to obtain the cellulose magnetic microspheres. The invention also discloses an application of the cellulose magnetic microsphere as an adsorbent in wastewater treatment, and the cellulose magnetic microsphere has excellent adsorption capacity on organic dye molecules in wastewater.

Description

technical field [0001] The invention belongs to the field of new cellulose-based materials, and in particular relates to a cellulose magnetic microsphere prepared by improving the reactivity of eucalyptus fiber and a preparation method thereof. The cellulose magnetic microsphere has excellent adsorption capacity for organic dye molecules in sewage. It has a good application prospect in the field of wastewater treatment. Background technique [0002] Cellulose is a macromolecular polysaccharide composed of glucose, insoluble in water and general organic solvents, and is the main component of plant cell walls. Cellulose is the most widely distributed and most abundant polysaccharide in nature, accounting for more than 50% of the carbon content in the plant kingdom. The cellulose content of cotton is close to 100%, making it the purest natural source of cellulose. In general wood, cellulose accounts for 40-50%, and there are 10-30% hemicellulose and 20-30% lignin. Cellulose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/24B01J20/28019B01J20/28009B01J20/08C02F1/286C02F2101/308
Inventor 吴珽房桂干李漫梁龙邓拥军林艳朱北平冉淼沈葵忠田庆文盘爱享焦健李红斌韩善明梁芳敏赵梦珂严振宇陈远航
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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