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Preparation method and application of citric acid grafted chitosan beads

A technology of chitosan and citric acid, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve unsatisfactory problems and achieve increased adsorption, biodegradability and biological Good compatibility, taking into account the effect of biocompatibility

Inactive Publication Date: 2018-12-21
GUANGZHOU ENVIRONMENTAL PROTECTION TECH EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent application CN 105597690A discloses a metal adsorption biological material, which is a porous foam-like material. The preparation raw materials include 1-10 parts of citric acid, 1-10 parts of xylan, and 1-10 parts of carboxymethyl chitosan. Cobalt, manganese, and copper have adsorption effects, and the maximum adsorption force for Cu reaches 71mg / g, but it is still not ideal

Method used

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  • Preparation method and application of citric acid grafted chitosan beads
  • Preparation method and application of citric acid grafted chitosan beads
  • Preparation method and application of citric acid grafted chitosan beads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: the preparation of citric acid grafted chitosan pellet

[0035] First, dissolve 18 g of citric acid in 100 mL of distilled water, add 3 g of chitosan (degree of deacetylation ≥ 90.0%, molecular weight 700,000-800,000), and stir for 5 hours at 25 ° C to obtain a uniform and stable chitosan-citric acid gel Then the above gel is poured into a 50mL burette, and dripped dropwise into 400mL of 1mol / L sodium hydroxide solution under magnetic stirring to form a wet gel ball with a particle size of 2.5-3mm; finally the above The formed wet gel balls were vacuum freeze-dried at -80°C for 24 hours to obtain loose and porous citric acid-grafted chitosan pellets. The preparation process of citric acid grafted chitosan pellets is as follows: figure 1 shown. The prepared citric acid-grafted chitosan pellets were detected by infrared spectrometer, and the results were as follows: figure 2 Shown, chitosan (chitosan) at 1658 and 1598cm -1 , while the citric acid grafte...

Embodiment 2

[0037] Embodiment 2: the preparation of citric acid grafted chitosan pellet

[0038] First, dissolve 18 g of citric acid in 100 mL of distilled water, add 3 g of chitosan (degree of deacetylation>90%), and stir for 6 h at 25° C. to obtain a uniform and stable chitosan-citric acid gel; Pour it into a 50mL burette, and drop it dropwise into 400mL of 1mol / L sodium hydroxide solution under magnetic stirring to form wet gel balls with a particle size of 2.5-3mm; finally, the wet gel balls formed above Vacuum freeze-dry at -80°C for 22 hours to obtain loose and porous citric acid-grafted chitosan pellets.

Embodiment 3

[0039] Example 3: Investigation of the influence of different conditions on the adsorption of citric acid-grafted chitosan pellets for copper ions

[0040] Prepare 25mL of copper ion solution with a concentration of 10mg / L, adjust the acidity and alkalinity of the copper solution with hydrochloric acid and / or sodium hydroxide solution to make the pH value 5.4±0.1, and then add 0.2, 0.4, 0.6, 0.8 to the solution respectively , 1.0, 1.2, 1.4, 1.6, 1.8, 2.0g / L chitosan-citric acid pellets, put them into a rotary mixer, the oscillation speed is 160rpm, the temperature is 25±1℃, take out the solution after 24h for measurement The concentration of copper ions was used to calculate the removal rate of copper ions. Under the condition of low concentration of 10mg / L, when the dosage of chitosan pellets is 1g / L, copper ions in water are completely removed.

[0041]Prepare 25mL of copper ion solution with a concentration of 10mg / L, adjust the acidity and alkalinity of the copper solutio...

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Abstract

The invention provides a preparation method of citric acid grafted chitosan beads. The preparation method comprises the following steps: 1) preparation of chitosan-citric acid gel: adding chitosan into a citric acid solution, and stirring uniformly to obtain the chitosan-citric acid gel; 2) preparation of citric acid grafted chitosan wet gel beads: pouring the chitosan-citric acid gel obtained inthe step 1 into a burette, dripping the chitosan-citric acid gel into a sodium hydroxide solution with magnetic stirring, and collecting to obtain citric acid grafted chitosan wet gel beads; 3) preparation of citric acid grafted chitosan beads: performing freeze drying treatment on the citric acid grafted chitosan wet gel beads obtained in the step 2) to obtain chitosan-citric acid beads. The invention belongs to the technical field of heavy metal adsorbents. By adopting the preparation method, the adsorption performance of the citric acid grafted chitosan beads is improved, the biocompatibility is taken into consideration, and the stability is improved. The citric acid grafted chitosan beads can be widely applied to adsorption of heavy metals such as copper ions.

Description

technical field [0001] The invention belongs to the technical field of heavy metal adsorbents, in particular to a preparation method and application of citric acid grafted chitosan pellets. Background technique [0002] In the historical development process of human society, water is one of the most important resources for human survival and development. However, the continuous growth of the world population in recent years, the rapid development of industrialization and urbanization have seriously polluted the water environment on which human beings depend, and produced a large amount of heavy metal wastewater (such as lead, chromium, arsenic, cadmium, copper, etc.) Seriously endanger human health, especially most metal ions and their compounds are easily adsorbed by suspended particles in the water and precipitate in the sediment layer of the water body, polluting the water body for a long time, and producing toxic effects on the human body. Therefore, effective treatment...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28019C02F1/286C02F2101/20
Inventor 张文斌汪晖吴天龙利进卓陈城池李善得庄兆军高忠本
Owner GUANGZHOU ENVIRONMENTAL PROTECTION TECH EQUIP
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