A kind of preparation method and application of ion-selective cellulose-based adsorbent

An ion-selective, cellulose-based technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of loss cost, poor selectivity of heavy metal ions, etc. Fast, wide-ranging effects

Active Publication Date: 2019-06-04
盐城德安德新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of small molecular compound plays the role of adsorbing heavy metal ions through ion exchange or chelation, but the selectivity of this type of adsorbent to heavy metal ions is relatively poor
The cavity structure with a specific inner diameter of the pyridone macrocyclic compound can selectively bind metal ions, but due to the loss of this type of compound in the solvent extraction process, the application cost is high

Method used

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  • A kind of preparation method and application of ion-selective cellulose-based adsorbent
  • A kind of preparation method and application of ion-selective cellulose-based adsorbent
  • A kind of preparation method and application of ion-selective cellulose-based adsorbent

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Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Preparation of pyridone six-membered macrocyclic compound modified cellulose-based adsorbent

[0037] Cellulose-based sorbents were prepared as follows:

[0038](1) Pretreatment: 10 grams of cellulose was swollen in 50 mL of 20% NaOH solution with a mass fraction of 20%, and the reaction time was 16 hours; the reaction temperature was 25°C;

[0039] (2) Succinic anhydride modification: 4.2 grams of pretreated cellulose and 12.6 grams of succinic anhydride undergo alcoholysis reaction in 170 mL of pyridine, the reaction temperature is the reflux temperature of the solvent, and the reaction time is 24 hours. Afterwards, wash with 20 mL of 1 mol / L dichloromethane acetic acid solution, 95% ethanol, distilled water, 0.01 mol / L dilute hydrochloric acid solution, and acetone;

[0040] (3) Amidation: the succinic anhydride modified cellulose obtained in the previous step is first reacted in DMF solution with coupling reagent DIC, the molar ratio of succinic anhydrid...

Embodiment 2

[0043] Example 2: Application of cellulose-based adsorbent in adsorbing metal ions

[0044] Put 25mg of the cellulose-based adsorbent of the present invention into 150mL, 40mg / L metal ion solution, stir and adsorb at room temperature, measure and calculate the adsorption capacity of the adsorbent after 20min. like Figure 4 As shown, the cellulose-based adsorbent of the present invention is effective for Ba(II), Fe(III), Fe(II), Mn(II), Ag(I), Cr(III), Cu(II), Co(II ), Hg(II) and other ions with adsorption capacities of 220.6, 100.2, 137.9, 320.83, 100.2, 124.6, 230.26, 889.35, 132.85 mg / g, respectively, showing a high selectivity for Co(II).

Embodiment 3

[0045] Example 3: Cellulose-based adsorbent reproducibility test

[0046] The influence of the repeated use of the adsorbent on its adsorption capacity was studied. The research results showed that the adsorbent could be desorbed with 0.1mol / L dilute hydrochloric acid solution for the adsorption of heavy metal ions. The adsorption capacity did not change much in the first five repeated uses. The adsorption capacity only decreased by 1% in the six adsorption tests.

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Abstract

The invention discloses a preparing method and application of an ion selectivity cellulose-based adsorbent, and belongs to the field of light chemical engineering. According to the preparing method, cellulose is firstly introduced to carboxyl, and then carboxyl is connected to secondary amine in pyridone derivatives so as to prepare the modified cellulose adsorbent. The prepared modified cellulose adsorbent has low cost, a high adsorption capacity and stable adsorbability. Adsorbed heavy metal ions and dyestuff can be reutilized, thus the modified cellulose adsorbent has the huge advantages of energy conservation and emission reduction and environmental friendliness.

Description

technical field [0001] The invention relates to a preparation method and application of an ion-selective cellulose-based adsorbent, which belongs to the field of light chemical industry. Background technique [0002] Heavy metal ions are an important factor in the pollution of industrial wastewater today. With the rapid development of industry today, the problem of heavy metal ion pollution has become increasingly prominent. The removal and recovery of heavy metal ions has become an important research topic today. Traditional heavy metal ion removal methods such as: chemical precipitation, activated carbon adsorption, solvent extraction and ion adsorption and exchange. Compared with other existing treatment methods, the adsorption method has the advantages of high adsorption capacity, the absorbed heavy metal ions and dyes can be reused, and the water quality after treatment is good without secondary pollution. The main method of adsorption and decolorization of dye residue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/265B01J2220/4825C02F1/286C02F2101/20C02F2101/308
Inventor 孙昌倪佳东许长海郭雨宁赵春燕
Owner 盐城德安德新材料科技有限公司
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