Cadmium ion adsorbent and preparation method thereof

A cadmium ion and adsorbent technology, applied in the field of cadmium ion adsorbent and its preparation, achieves the effects of stable adsorption performance, broad industrial application prospect, high adsorption rate and adsorption capacity

Inactive Publication Date: 2018-11-16
ANQING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, up to now, there are few relevant reports on the preparation of cadmium ion adsorbent by alginate and melamine and its application in the treatment of cadmium ion-containing wastewater.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: synthetic cadmium ion adsorbent

[0025] figure 1 Prepare the synthetic route map of cadmium ion adsorbent for this embodiment, as figure 1 As shown, the specific steps are as follows:

[0026] (1) Weigh 1.5g sodium alginate (viscosity: 200±20mPa·s) and dissolve it in 98.5g pH5.5 2-morpholineethanesulfonic acid-sodium hydroxide (MES) buffer solution, and add 0.15g 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and 0.5g melamine, under the condition of 25 ℃, continue to stir and react for 12h, and then use a 10mL medical syringe to Add the mixed solution dropwise to 500mL 0.2mol / L calcium nitrate solution, continue to stir for 20min after dropping, filter and wash with distilled water to prepare calcium alginate-melamine composite hydrogel;

[0027] (2) Soak the calcium alginate-melamine composite hydrogel prepared in step (1) in distilled water, freeze and vacuum-dry in a vacuum freeze dryer, (the condition of vacuum freeze-drying is:...

Embodiment 2

[0028] Embodiment 2: synthetic cadmium ion adsorbent

[0029] (1) Weigh 1.5g potassium alginate and dissolve it in 98.5g pH 5.5 2-morpholineethanesulfonic acid (MES) buffer solution, and add 0.15g 1-(3-dimethylaminopropyl)- 3-Ethylcarbodiimide hydrochloride (EDC) and 0.5g melamine, under the condition of 25 ℃, continue to stir and react for 12h, and then use a 10mL medical syringe to drop the mixed solution into 500mL0.2mol / L calcium nitrate solution In the process, continue to stir for 20 minutes after dropping, filter and wash with distilled water to obtain calcium alginate-melamine composite hydrogel;

[0030] (2) Soak the calcium alginate-melamine composite hydrogel prepared in step (1) in distilled water, place in a vacuum freeze dryer to freeze and dry in vacuum, and make calcium alginate-melamine composite aerogel (cadmium ion adsorbent).

[0031] The difference between Example 2 and Example 1 is that sodium alginate is replaced by potassium alginate.

Embodiment 3

[0032] Embodiment 3: synthetic cadmium ion adsorbent

[0033] (1) Weigh 1.5g of alginic acid and dissolve it in 98.5g of 2-morpholineethanesulfonic acid-sodium hydroxide (MES) buffer solution with pH 5.5, and add 0.15g of 1-(3-dimethylaminopropyl )-3-Ethylcarbodiimide hydrochloride (EDC) and 0.5g melamine, under the condition of 25 ℃, continue to stir and react for 12h, and then use a 10mL medical syringe to drop the mixed solution into 500mL0.2mol / L nitric acid In the calcium solution, continue to stir for 20 minutes after dropping, filter and wash with distilled water to obtain calcium alginate-melamine composite hydrogel;

[0034] (2) Soak the calcium alginate-melamine composite hydrogel prepared in step (1) in distilled water, place in a vacuum freeze dryer to freeze and dry in vacuum, and make calcium alginate-melamine composite aerogel (cadmium ion adsorbent).

[0035] 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 and a preparation method thereof. According to the preparation method, through condensation reactions between carboxyl and amino, a functional reagent I(alginate) and a functional reagent II are connected; then cadmium ion adsorbent hydrogel is prepared from an alkaline-earth metal ion solution; and finally the cadmium ion adsorbent hydrogel is dried to prepare the cadmium ion adsorbent. The invention also discloses applications of the cadmium ion adsorbent. The cadmium ion adsorbent can be easily separated from water, can efficiently absorb cadmium ions in water, and has a large cadmium adsorption capacity; after several times of application, a stable adsorption performance is stilled maintained; and the cadmium ion adsorbent can be used toprocess industrial wastewater and environmental water, which contain cadmium ions, and has a high application value.

Description

technical field [0001] The invention belongs to the field of solid-phase adsorption, and in particular relates to a cadmium ion adsorbent and a preparation method thereof. Background technique [0002] With the rapid development of metallurgy, electroplating and chemical industries (such as batteries, preservatives, pigments), many wastewaters containing cadmium ions are discharged into natural water bodies. Cadmium ions entering the water body not only cannot be biodegraded, but also enter the human body through the food chain and accumulate in the human body, thus causing a series of serious physiological diseases, such as rickets, kidney damage, and central nervous system damage. Therefore, it is of great significance to remove cadmium ions in water. [0003] At present, the methods for removing cadmium ions in water mainly include ion exchange method, membrane filtration method, electrochemical method, adsorption method, chemical precipitation method, biological method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/22B01J20/24B01J20/28047B01J2220/4806B01J2220/4812B01J2220/4825C02F1/285C02F1/286C02F2101/20
Inventor 王敏汪竹青吴根华
Owner ANQING NORMAL UNIV
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