Cadmium ion adsorbent and preparation method and application thereof

A technology of cadmium ion and adsorbent, which is applied in the field of cadmium ion adsorbent and its preparation, can solve the problems of low adsorption capacity of activated carbon, difficult recycling and poor recycling performance, etc., and achieve fast adsorption rate, low cost and stable performance Effect

Active Publication Date: 2017-10-20
ANQING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon has low adsorption capacity and poor recycling performance, and hydroxyapatite and functionalized nanomaterials are difficult to recycle due to their small size

Method used

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  • Cadmium ion adsorbent and preparation method and application thereof
  • Cadmium ion adsorbent and preparation method and application thereof
  • Cadmium ion adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of preparation method of cadmium ion adsorbent, concrete steps are as follows:

[0030] (1) Weigh 1.0g of sodium alginate and 1.0g of disodium ethylenediaminetetraacetate and dissolve them in 50mL of water, and add 0.35g of 1-ethyl-(3-dimethylaminopropyl)carbodiethylene Amine hydrochloride and 0.25g N-hydroxysuccinimide were activated for 1h, then 10mL of ethylenediamine was added, and reacted at 25°C for 4h to obtain solution I;

[0031] (2) under stirring condition, solution 1 is dripped in the calcium nitrate solution of 0.2mol / L dropwise, continue to stir 30min after dripping, obtain solid-liquid mixture;

[0032] (3) The solid after filtering the solid-liquid mixture is washed with distilled water, and then subjected to vacuum freeze-drying to obtain the cadmium ion adsorbent. The scanning electron microscope image of the cadmium ion adsorbent is as follows: figure 1 shown.

Embodiment 2

[0034] A kind of preparation method of cadmium ion adsorbent, concrete steps are as follows:

[0035] (1) Weigh 1.0g of potassium alginate and 1.0g of disodium ethylenediaminetetraacetate and dissolve it in 50mL of water, and add 0.35g of 1-ethyl-(3-dimethylaminopropyl)carbodiethylene Amine hydrochloride and 0.25g N-hydroxysuccinimide were activated for 1h, then 10mL of ethylenediamine was added, and reacted at 25°C for 4h to obtain solution I;

[0036] (2) under stirring condition, solution 1 is dripped in the calcium nitrate solution of 0.2mol / L dropwise, continue to stir 30min after dripping, obtain solid-liquid mixture;

[0037] (3) The solid after filtering the solid-liquid mixture is washed with distilled water, and then subjected to vacuum freeze-drying to obtain the cadmium ion adsorbent.

[0038] The difference between Example 2 and Example 1 is that sodium alginate is replaced by potassium alginate.

Embodiment 3

[0040] A kind of preparation method of cadmium ion adsorbent, concrete steps are as follows:

[0041] (1) Weigh 1.0g of alginic acid and 1.0g of disodium ethylenediaminetetraacetate and dissolve it in 50mL of water, and add 0.35g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide under stirring condition Hydrochloride and 0.25g N-hydroxysuccinimide were activated for 1h, then 10mL of ethylenediamine was added, and reacted at 25°C for 4h to obtain solution I;

[0042] (2) under stirring condition, solution 1 is dripped in the calcium nitrate solution of 0.2mol / L dropwise, continue to stir 30min after dripping, obtain solid-liquid mixture;

[0043] (3) The solid after filtering the solid-liquid mixture is washed with distilled water, and then subjected to vacuum freeze-drying to obtain the cadmium ion adsorbent.

[0044] 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 a cadmium ion adsorbent made from alginate and ethylenediaminetetraacetic acid salt; carboxyl groups in the alginate and ethylenediaminetetraacetic acid salt are activated via 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide, ethylenediamine is added as a linker so as to cause condensation aeration of amino groups at two ends with the alginate and ethylenediaminetetraacetic acid salt, the alginate and the ethylenediaminetetraacetic acid salt are linked and are then gelled in an alkaline-earth metal ionic liquid, and drying is performed to obtain the cadmium ion adsorbent. The cadmium ion adsorbent has the advantages that selectivity for cadmium ions is high, adsorbing capacity is high, recycling is easy, the regenerating process is simple, and the adsorbing property of the adsorbent is kept stable after multiple recycling; the adsorbent is applicable to the treatment of cadmium-ion-containing wastewater and the treatment of various water samples acquired by treating cadmium-containing solid samples, and has good application value.

Description

technical field [0001] The invention relates to the technical field of solid-phase adsorption, and more specifically relates to a cadmium ion adsorbent and a preparation method and application thereof. Background technique [0002] With the rapid development of industries such as electroplating, mining and metallurgy, batteries, dyestuffs and chemicals, many waste water containing cadmium ions are discharged into natural water bodies. Human body, thus causing some irreversible physiological diseases, such as osteoporosis and softening, loss of smell and liver and kidney damage. Therefore, it is of great significance to remove cadmium ions in water. [0003] At present, the common treatment methods for wastewater containing cadmium ions include: adsorption method, ion exchange method, electrolysis method, chemical precipitation method, solvent extraction method, membrane filtration method, etc. Among them, although the ion exchange method has a significant effect, the amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20
Inventor 汪竹青王敏金鹏翔
Owner ANQING NORMAL UNIV
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