Method for adsorbing heavy metal ions by corncob cellulose-based hydrogel

A cellulose-based, corn cob technology, applied in the direction of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of low adsorption capacity, poor adsorption capacity, slow adsorption rate, etc., and increase the specific surface area , increase the amount of adsorption, reduce the effect of the amount

Active Publication Date: 2018-01-09
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low adsorption capacity, slow adsorption rate, unstable structure and poor adsorption capacity of traditional plant fiber-based heavy metal adsorbents, improve the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Nitric acid-ethanol corncob cellulose was extracted as follows:

[0060] Weigh a certain amount of corncobs into a conical flask, add nitric acid-ethanol (1:4 nitric acid: ethanol) mixture, heat on a water bath at 85°C for 1 hour through a reflux condensing device, and transfer the residue into a G2 glass filter , remove the filtrate. The above process was repeated 2 times. Finally, the filter loaded with cellulose was moved into an oven and dried at 105°C until constant weight.

Embodiment 2

[0062] The corncob cellulose-based hydrogel was prepared according to the following steps:

[0063] Optimization of the MMT / LNC mass ratio: 1. Weigh an appropriate amount of corn cob cellulose and put it into a three-necked flask, add distilled water to dissolve it, and put it into MMT (MMT / LNC mass ratios are 0, 0.03, 0.05, 0.08 and 0.11, respectively). Introduce N at 85°C 2 Stir for 60min, then add tetramethylethylenediamine (tetramethylethylenediamine / LNC is 0.2mL / g) and ammonium persulfate (ammonium persulfate / LNC mass ratio is 0.2), stir for 10min, then add AA (AA The mass ratio of / LNC is 16) and MBA (the mass ratio of MBA / LNC is 0.2), continues heating and stirring to obtain corncob cellulose-based hydrogel. The resulting hydrogel was added to absolute ethanol and left to stand for 24 hours, washed with deionized water, dried at 60° C. for 24 hours, and cut into pieces for later use.

[0064] 2. Put the spare corn cob cellulose-based hydrogel into the heavy metal ion ...

Embodiment 3

[0067] The corncob cellulose-based hydrogel was prepared according to the following steps:

[0068] Optimization of the mass ratio of AA / LNC: 1. Weigh an appropriate amount of corn cob cellulose into a three-necked flask, add distilled water to dissolve it, put it into MMT (the mass ratio of MMT / LNC is 0.08), and feed N at 85°C. 2 Stir for 60min, then add tetramethylethylenediamine (the volume / mass ratio of tetramethylethylenediamine / LNC is 0.2mL / g) and ammonium persulfate (the mass ratio of ammonium persulfate / LNC is 0.2), and stir for 10min. Then add AA (the mass ratio of AA / LNC is 8, 12, 16, 20 and 24, respectively) and MBA (the mass ratio of MBA / LNC is 0.2), and continue heating and stirring to obtain the corncob cellulose-based hydrogel. The resulting hydrogel was added to absolute ethanol and left to stand for 24 hours, washed with deionized water, dried at 60° C. for 24 hours, and cut into pieces for later use.

[0069] 2. Put the spare corn cob cellulose-based hydroge...

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Abstract

The invention discloses a method for adsorbing heavy metal ions by corncob cellulose-based hydrogel. The method comprises the steps of dissolving corncob cellulose at first, adding montmorillonoid toheat and stir to insert the corncob cellulose into montmorillonoid layers, adding tetramethyl ethylenediamine and ammonium persulfate to stir, then adding acrylic acid and N,N'-methylene bisacrylamideand continuing heating and stirring to obtain the hydrogel. The corncob cellulose is pure cellulose which is extracted from corncob by a nitric acid-ethyl alcohol method. By means of optimizing dosage of the montmorillonoid, the N,N'-methylene bisacrylamide and the acrylic acid, the corncob cellulose-based hydrogel which has the optimal structure and adsorption performance is obtained; by means of optimizing different concentrations, pH values and adsorption times of the heavy metal ion solutions, the optimal adsorption condition of the hydrogel disclosed by the invention is determined. The preparation method disclosed by the invention has the advantage of simple technology, and the prepared hydrogel has the advantages of better adsorption performance, better structural stability and goodadsorption effect on heavy metal ions.

Description

technical field [0001] The present invention relates to corncob cellulose-based hydrogels for heavy metal ions (Zn 2+ , Cd 2+ and Cr 3+ ) adsorption performance, especially involving the hydrogel prepared from nitric acid-ethanol corn cob cellulose on Zn under different optimized conditions 2+ , Cd 2+ and Cr 3+ Adsorption of heavy metal ions. technical background [0002] Corn cob cellulose (LNC) is a kind of abundant and renewable natural polymer material with good biodegradability and non-toxicity. It is a natural grass cellulose. During the preparation process, lignin and hemicellulose Lignocellulose is easier to remove than other lignocelluloses. Utilizing renewable corncob cellulose to develop and produce degradable hydrogels can maximize its utilization value. The hydroxyl group on the macromolecule of corn cob cellulose can participate in reactions such as carboxylation and acidification. Various active groups, such as carbonyl and carboxyl, can be introduced i...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30B01J13/00C08F251/02C08F220/06C08F222/38C08F2/44C08K3/34C02F1/28C02F101/20C02F101/22
Inventor 杨桂花陈嘉川吉兴香周慧芳
Owner QILU UNIV OF TECH
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