Preparation method of hydrogel for adsorbing anionic dye and metal ions by carbon dioxide response expansion

A technology of anionic dyes and metal ions, applied in chemical instruments and methods, adsorption of water/sewage treatment, alkali metal compounds, etc., to achieve the effects of avoiding dangerous operations, good cyclic expansion and contraction performance, and simple preparation process

Active Publication Date: 2020-09-25
EAST CHINA JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the many problems that existing adsorbents are used to remove dyes and heavy metal ions in wastewater. The present invention proposes a method for preparing a hydrogel that absorbs anionic dyes and metal ions in response to carbon dioxide expansion.

Method used

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  • Preparation method of hydrogel for adsorbing anionic dye and metal ions by carbon dioxide response expansion
  • Preparation method of hydrogel for adsorbing anionic dye and metal ions by carbon dioxide response expansion
  • Preparation method of hydrogel for adsorbing anionic dye and metal ions by carbon dioxide response expansion

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Embodiment 1

[0028] Add 5% mass fraction of diethylaminoethyl methacrylate, 0.5% mass fraction of N,N-methylenebisacrylamide, 1% mass fraction of Pluronic F127, and 5% mass fraction in the reaction vessel Hydrochloric acid, ammonium persulfate with a mass fraction of 0.2%, water with a mass fraction of 18.25%, after uniform stirring, drop in toluene with a mass fraction of 70% and mix evenly, then add tetramethylethylenediamine with a mass fraction of 0.05%, at 40°C After reacting for 18 hours, after polymerization, it was neutralized to neutrality with 0.5% by mass sodium hydroxide aqueous solution to obtain carbon dioxide responsive expansion to adsorb anionic dyes and metal ion hydrogels.

[0029] The carbon dioxide and nitrogen response of the carbon dioxide response swelling adsorption anion dye and metal ion hydrogel obtained in this example can be cyclically expanded and contracted, such as figure 2 shown.

Embodiment 2

[0031] Add 5% mass fraction of diethylaminoethyl methacrylate, 0.5% mass fraction of N,N-methylenebisacrylamide, 1% mass fraction of Pluronic F127, and 5% mass fraction in the reaction vessel Hydrochloric acid, ammonium persulfate with a mass fraction of 0.2%, water with a mass fraction of 18.25%, after uniform stirring, drop in toluene with a mass fraction of 70% and mix evenly, then add tetramethylethylenediamine with a mass fraction of 0.05%, at 45°C After reacting for 18 hours, after polymerization, it was neutralized to neutrality with 0.5% by mass sodium hydroxide aqueous solution to obtain carbon dioxide responsive expansion to adsorb anionic dyes and metal ion hydrogels.

[0032] This embodiment is to anionic dye alizarin red adsorption performance such as image 3 As shown, the adsorption capacity reached 2696 mg g -1 .

Embodiment 3

[0034] Add 10% mass fraction of diethylaminoethyl methacrylate, 0.1% mass fraction of N,N-methylenebisacrylamide, 0.5% mass fraction of Pluronic F127, and 1% mass fraction in the reaction vessel Hydrochloric acid, ammonium persulfate with a mass fraction of 0.1%, water with a mass fraction of 13.29%, after uniform stirring, drop in toluene with a mass fraction of 75%, mix evenly, add tetramethylethylenediamine with a mass fraction of 0.01%, and at 50°C After reacting for 18 hours, after polymerization, it was neutralized to neutrality with 0.5% by mass sodium hydroxide aqueous solution to obtain carbon dioxide responsive expansion to adsorb anionic dyes and metal ion hydrogels.

[0035] The present embodiment is to the anionic dye allura red adsorption performance such as image 3 As shown, the adsorption capacity reached 2381 mg g -1 .

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Abstract

The invention relates to a preparation method of hydrogel for adsorbing anionic dye and metal ions by carbon dioxide response expansion. The method comprises the following steps: stirring diethyl amino ethyl methacrylate, N-N methylene bisacrylamide, a polyether compound, an acid, an initiator, and water according to a certain proportion to form a mixed solution; slowly dropwise adding methylbenzene into the mixed solution, then adding a polymerization accelerator, polymerizing at a certain reaction temperature, and neutralizing with an alkaline solution after polymerization to form the hydrogel for adsorbing anionic dye and metal ions by carbon dioxide response expansion. The prepared gel can realize reversible transformation of expansion and contraction under the cyclic stimulation of carbon dioxide and nitrogen. The gel has high adsorption capacity for anionic dyes and metal ions. The adsorbed dye can be released in an alkaline environment, and the release rate is higher than 85%. The hydrogel has a huge potential application value in the fields of environmental wastewater treatment.

Description

technical field [0001] The invention relates to a hydrogel preparation method for absorbing anionic dyes and metal ions in response to carbon dioxide expansion, and belongs to the technical field of water treatment. Background technique [0002] Currently, water pollutants from industrial wastewater discharge have become a global concern. For example, a large amount of wastewater generated by industries such as papermaking, leather, textiles, plastics, cosmetics, and electroplating. The main pollutants in wastewater are organic dyes (especially anionic dyes) and heavy metal ions, such as Cr(VI) (Cr 2 o 7 2- 、HCrO 4 - ), As(V) (AsO 4 3- )Wait. Studies have shown that the presence of organic dyes and heavy metal ions leads to many physical and mental diseases, such as cancer, tumors, anemia and psychosis. More and more evidence shows that after the dye is mixed with metal ions, its physical and chemical properties have undergone significant changes, making wastewater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/34C08F222/38C08J3/075B01J20/26B01J20/28B01J20/30C02F1/28C08L51/08C02F101/20C02F101/30
CPCC08F283/06C08J3/075B01J20/265B01J20/28047C02F1/288C08J2351/08C02F2101/20C02F2101/308C02F2303/16C08F220/34C08F222/385Y02C20/40
Inventor 郭赞如张银山熊乐艳
Owner EAST CHINA JIAOTONG UNIVERSITY
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