A kind of preparation method of straw composite adsorbent modified by magnetic chitosan and its product and application

A composite adsorption and chitosan technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, magnetic field/electric field water/sewage treatment, etc., can solve the problem of complicated modification process operation, high modifier cost, toxic drugs and other problems, to achieve broad application prospects, improve adsorption performance, and simple preparation methods

Inactive Publication Date: 2021-02-09
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, straw has great utilization value. For example, straw has a natural loose and porous structure, which is an ideal raw material for the preparation of adsorbents. However, due to the low adsorption capacity of straw as an adsorbent, it must be modified to show better adsorption effect
At present, there are many reports on the modification of straw as an adsorbent. For example, patents CN107252678A, CN107008235A, and CN106861648A respectively use sulfhydryl modification, hyperbranched polymer modification, and vulcanization chelation modification to modify straw. Good adsorption effect, but these modification processes are complicated to operate, the cost of modifiers is high, and some are toxic drugs, so the application is limited
[0006] At present, there are no related reports on the preparation of adsorbents by combining chitosan, straw fiber, and magnetic nanoparticles. The research on adsorbents with better performance, lower cost, and easier preparation has a good application prospect.

Method used

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  • A kind of preparation method of straw composite adsorbent modified by magnetic chitosan and its product and application
  • A kind of preparation method of straw composite adsorbent modified by magnetic chitosan and its product and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Preparation of magnetic nanoparticles CoFe 2 o 4

[0033] a. Weigh 6.06 g Fe(NO 3 ) 3 9H 2 O and 1.785 g CoCl 2 ·6H 2 O was dissolved in 70 mL of ethylene glycol under the condition of magnetic stirring to obtain a dark yellow solution;

[0034] b. Weigh 7.2 g CH 3 COONa was dissolved in the above solution, and magnetically stirred for 10 min to obtain a black viscous liquid;

[0035] c. Pour the above black viscous liquid into a 100 mL Teflon-lined reactor, and place the reactor in an oven at 200 °C for 8 h;

[0036] d. After the reaction is completed, the reactor is cooled to room temperature, and the solid particles generated by the reaction are separated by a magnet, washed three times with ethanol and distilled water, and dried to obtain magnetic nanoparticles CoFe 2o 4 ;

[0037] 2) Preparation of activated straw powder

[0038] a. The corn stalks collected from the countryside were dried in an oven at 40 °C for 24 hours, the skin of the stalks was ...

Embodiment 2

[0051] 1) Preparation of magnetic nanoparticles CoFe 2 o 4

[0052] With embodiment 1.

[0053] ) to prepare activated straw powder

[0054] a. The corn stalks collected from the countryside were dried in an oven at 40 °C for 24 hours, the skin of the stalks was peeled off manually, the straw core was taken out, the straw core was crushed with a grinder, and the finer straw powder was selected with a 100-mesh sieve;

[0055] b. Soak straw powder in 1.5mol / L NaOH solution for 22 hours, rinse with water until the washing solution becomes neutral;

[0056] c. adding the stalk powder that step b obtains to 5% ZnCl 2 In aqueous solution, per mL ZnCl 2 Add 0.01 g of straw powder to the solution, stir in a water bath at 70 °C for 1.5 h to obtain a colloid;

[0057] d. Suction filter the colloid, wash three times with ethanol and distilled water successively, and dry to obtain activated straw powder;

[0058] 3) Preparation of magnetic chitosan modified straw powder composite a...

Embodiment 3

[0067] 1) Preparation of magnetic nanoparticles CoFe 2 o 4

[0068] With embodiment 1.

[0069] ) to prepare activated straw powder

[0070] a. The corn stalks collected from the countryside were dried in an oven at 40 °C for 24 hours, the skin of the stalks was peeled off manually, the straw core was taken out, the straw core was crushed with a grinder, and the finer straw powder was selected with a 100-mesh sieve;

[0071] b. Soak straw powder in 2.5mol / L NaOH solution for 20 h, rinse with water until the washing solution becomes neutral;

[0072] c. adding the stalk powder that step b obtains to 15% ZnCl 2 In aqueous solution, per mL ZnCl 2 Add 0.03 g of straw powder to the solution, stir in a water bath at 72 °C for 1.5 h to obtain a colloid;

[0073] d. Suction filter the colloid, wash three times with ethanol and distilled water successively, and dry to obtain activated straw powder;

[0074] 3) Preparation of magnetic chitosan modified straw powder composite adso...

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Abstract

The invention discloses a preparation method of a magnetic chitosan modified straw composite adsorbent and an obtained product and application. The composite adsorbent is prepared by compounding and crosslinking an activated straw powder, chitosan and CoFe2O4. The large-skeleton straw and the high-adsorption capacity chitosan are combined for the first time, the effective utilization value is found for the waste of biomass, the adsorption property of the adsorbent is improved, and the cost of the adsorbent is also lowered. The preparation method is simple, does not need the high-energy consumption processes like high-temperature pyrolysis, and does not need other complicated processes or expensive chemical agents, the composite adsorbent is loose and fluffy, the adsorbing capacity is high,the adsorption process is simple and feasible, the adsorbent is convenient to separate, no secondary pollution is caused after the adsorption, the adsorbent can be repeatedly used, and the compositeadsorbent is an economical green environmentally friendly novel adsorbent material and has a broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of a magnetic chitosan-modified straw composite adsorbent, and also relates to the magnetic chitosan-modified straw composite adsorbent prepared by the method and the application of the adsorbent, belonging to the technical field of adsorbents. Background technique [0002] With the development of industry and the advancement of technology, the use of dyes is becoming more and more extensive. In order to make products have more vivid colors, dyes are used in textiles, paper making, construction, food processing, plastic dyeing, leather and rubber dyeing and other fields. However, while dyes make our lives more colorful, they also bring many problems. For example, during the use of dyes, a large amount of dye wastewater is likely to be produced. Dye wastewater is a harmful industrial wastewater with a wide range of sources, large reserves, complex components, and serious environmental pollution. If the dye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/24B01J20/30C02F1/28C02F1/48C02F101/38C02F101/36C02F101/34C02F101/30
CPCB01J20/22B01J20/24C02F1/286C02F1/488C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 刘珊珊葛曷一金朝生邹玉
Owner UNIV OF JINAN
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