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Ion adsorbent and preparation method and application thereof

A technology of ion adsorbent and calcium ion, which is applied in the field of ion adsorbent and its preparation, to achieve the effect of stable performance, less steps and mild conditions

Pending Publication Date: 2020-01-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few adsorbents that can be used for hard water softening. Therefore, the preparation of an efficient, environmentally friendly, easy-to-operate, and easy-to-handle calcium and magnesium ion adsorbent has very broad application prospects.

Method used

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  • Ion adsorbent and preparation method and application thereof
  • Ion adsorbent and preparation method and application thereof
  • Ion adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Preparation of ionic adsorbent:

[0063] (1) Weigh 1.0g of sodium alginate and 1.0g of citric acid and dissolve them in 50mL of water, and add 0.25g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and 0.15g of N-hydroxysuccinimide was activated for 3 hours, then 9.0g of ethylenediamine was added, and reacted at 25°C for 2 hours to obtain solution I;

[0064] (2) Under stirring conditions at 25°C, drop solution I into a 0.2mol / L calcium nitrate solution, and continue stirring for 20 minutes after dropping; filter, wash the solid product with deionized water, and freeze-dry in a vacuum , to prepare ion adsorbents.

[0065] The morphology photo of the ion adsorbent is as follows: figure 1 shown.

Embodiment 2

[0067] Preparation of ionic adsorbent:

[0068] (1) Weigh 1.0g potassium alginate and 1.0g citric acid and dissolve in 50mL water, under stirring condition, add 0.25g 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and 0.15g of N-hydroxysuccinimide was activated for 3 hours, then 9.0g of ethylenediamine was added, and reacted at 25°C for 2 hours to obtain solution I;

[0069] (2) Under stirring conditions at 25°C, drop solution I into a 0.2mol / L calcium nitrate solution, and continue stirring for 20 minutes after dropping; filter, wash the solid product with deionized water, and freeze-dry in a vacuum , to prepare ion adsorbents.

[0070] The difference between Example 2 and Example 1 is that sodium alginate is replaced by potassium alginate.

Embodiment 3

[0072] Preparation of ionic adsorbent:

[0073] (1) Weigh 1.0g of alginic acid and 1.0g of citric acid and dissolve them in 50mL of water, and add 0.25g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and 0.15 g N-hydroxysuccinimide was activated for 3 hours, then 9.0 g of ethylenediamine was added, and reacted for 2 hours at 25°C to obtain solution I;

[0074] (2) Under stirring conditions at 25°C, drop solution I into a 0.2mol / L calcium nitrate solution, and continue stirring for 20 minutes after dropping; filter, wash the solid product with deionized water, and freeze-dry in a vacuum , to prepare ion adsorbents.

[0075] The difference between Example 3 and Example 1 is that sodium alginate is replaced by alginic acid.

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Abstract

The invention discloses an ion adsorbent as well as a preparation method and application thereof, and belongs to the technical field of solid-phase adsorption. The method comprises the following steps: by means of alginate and citrate as raw materials, connecting the alginate and citrate through an amidation reaction by using ethylenediamine as a connecting agent, dropwise adding the reaction product into an alkaline-earth metal ion solution for gelatinization, and carrying out solid-liquid separation and drying to obtain the ion adsorbent. The ion adsorbent is preferably used for removing calcium ions and / or magnesium ions in a water body. The ion adsorbent provided by the invention is high in adsorption rate, high in adsorption rate and large in adsorption capacity for various heavy metal ions, particularly calcium ions and magnesium ions, can be regenerated after simple treatment, and still keeps stable in adsorption performance after being recycled for multiple times; the preparation method of the ion adsorbent provided by the invention is simple in technological process, few in steps, mild in condition and green and cheap in raw materials, so that the efficient and environment-friendly ion adsorbent can be prepared at low cost.

Description

technical field [0001] The application relates to an ion adsorbent and its preparation method and application, belonging to the technical field of solid-phase adsorption. Background technique [0002] Due to the influence of geographical factors and human activities, the content of calcium and magnesium salts in the environmental water bodies in most regions of my country is too high, that is, there is a problem of hard water. However, the use and drinking of hard water will bring many problems, such as scale plaques appearing on water utensils, the washing efficiency of detergents is reduced, rough skin after bathing, messy and dull hair, affecting the taste of food, and gastrointestinal disorders. Clothing damage is particularly noticeable. Therefore, it is of great practical significance to remove the high content of calcium and magnesium ions in water. [0003] At present, the common treatment methods for water containing calcium and magnesium ions include: lime soda a...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C08B37/04C02F101/20C02F101/10
CPCB01J20/24C02F1/286C08B37/0084B01J2220/4812B01J2220/4825C02F2101/20C02F2101/10
Inventor 吴爱国金鹏翔张玉杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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