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Preparation method of natural polyelectrolyte gel adsorbent for wastewater treatment

A polyelectrolyte and wastewater treatment technology, applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult separation, decreased adsorption capacity, loss of active points, etc. Inexpensive, fast response, fast adsorption effect

Inactive Publication Date: 2014-03-12
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, (modified) natural polyelectrolytes are also difficult to separate after being used as flocculants in wastewater treatment, and crosslinking these natural polyelectrolytes through crosslinking agents will also deplete the active sites with adsorption, thus making them Decreased adsorption capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 25g of polyethylene glycol with a molecular weight of 1,000 to a 250ml single-necked round-bottomed flask containing 150ml of dry dichloromethane, place the single-necked round-bottomed flask in an ice bath and cool to 0°C, first add 15.2g of triethylamine, then Add 13.6g of acryloyl chloride dropwise, stir and react at 0°C for 12h, then continue to react at 25°C for 12h, filter to remove by-products, precipitate with petroleum ether, and dry the precipitate under vacuum at 40°C to Constant weight yielded acrylate-terminated polyethylene glycol macromers.

[0016] To 100 g of sodium alginate aqueous solution with a mass percentage concentration of 5%, add 15 g of the above-mentioned diacrylate-capped polyethylene glycol macromonomer, stir and dissolve, then add 0.85 g of 2,2-dimethoxy- 2-Phenyl-acetophenone solution, stirred evenly, ultrasonicated for 10 minutes, and placed in an ultraviolet light with an intensity of 0.2mW / cm 2 The natural polyelectrolyte gel adso...

Embodiment 2

[0018] 30g of polyethylene glycol with a molecular weight of 6,000 was dissolved in a 250ml single-necked round-bottomed flask filled with 150ml of dry methylene chloride, and then 2.84g of glycidyl methacrylate and 2.44g of catalyst 4-dimethylaminopyridine were added successively to react. The mixed solution was stirred and reacted at room temperature for 48 hours. After the reaction was completed, it was precipitated with petroleum ether, filtered, dried, and placed in a vacuum oven for 48 hours at room temperature to obtain a dimethacrylate-terminated polyethylene glycol macromolecular unit. body.

[0019] Add 25 g of the dimethacrylate-capped polyethylene glycol macromonomer prepared above to 100 g of an aqueous solution containing carboxymethyl starch sodium (1 g) and sodium alginate (2 g) with a concentration of 3% by mass, and stir After dissolving, add 1.67g of 2,2-diethoxy-acetophenone solution, stir evenly, ultrasonicate for 5min, and place in an ultraviolet light wi...

Embodiment 3

[0021] Add 25g of polyethylene glycol with a molecular weight of 10,000 to a 250ml single-necked round-bottomed flask containing 150ml of dry dichloromethane, place the single-necked round-bottomed flask in an ice bath and cool to 0°C, add 1.52g of triethylamine first, then Add 1.57g of methacryloyl chloride dropwise, stir and react at 0°C for 12h, then continue to react at 25°C for 12h, filter to remove the by-products, and precipitate with petroleum ether, and the precipitate is vacuumed at 40°C Dry to constant weight to obtain a dimethacrylate-terminated polyethylene glycol macromonomer.

[0022] To 100g mass percent concentration of 5% chitosan aqueous solution (containing 1% acetic acid aqueous solution), add 20g of the above-prepared dimethacrylate-capped polyethylene glycol macromonomer, after stirring and dissolving, add 0.5g 2-Hydroxy-2-methyl-1-acetone solution, stirred evenly, ultrasonicated for 15 minutes, placed in a UV light with an intensity of 16mW / cm 2 The na...

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Abstract

The invention belongs to the technical field of environmental protection, and relates to a preparation method of a natural polyelectrolyte gel adsorbent for treating wastewater containing heavy metal ions and dyes. The method comprises the following steps: dissolving natural polyelectrolyte in water to prepare a polyelectrolyte water solution of which the mass concentration is 1-5%, adding 15-30 parts by weight of bis-acrylate or bis-methacrylate terminated polyethyleneglycol high-polymer monomer into 100 parts by weight of polyelectrolyte water solution, dissolving by stirring, adding 0.1-0.5 part of photoinitiator, uniformly mixing, carrying out ultrasonic treatment for 5-15 minutes, pouring into a mold, and irradiating under low-intensity ultraviolet light with the wavelength of 365nm to obtain the natural polyelectrolyte gel adsorbent. The preparation process does not relate to any organic solvent, toxic crosslinking agent or related chemical reaction; and thus, the preparation method is simple and quick to use, and can be used for treating wastewater containing heavy metal ions, dyes and the like.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to a preparation method of a natural polyelectrolyte gel adsorbent, which can be used for wastewater treatment containing heavy metal ions and dyes. Background technique [0002] In recent years, with the continuous increase in the discharge of industrial and agricultural wastewater and urban domestic sewage, rivers, rivers, lakes and other waters have generally been polluted to varying degrees, and the water quality has continued to deteriorate, causing serious harm to human health and the ecological environment. The commonly used wastewater treatment methods in industry are mainly divided into physical treatment, chemical treatment and biological treatment. However, most of the treatment methods have problems such as large dosage of treatment agent, high cost, unsatisfactory effect, and secondary pollution. Adsorption is a simple, cheap and effective treatment method, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/291B01J20/30C02F1/28C02F1/58C02F1/62
Inventor 赵三平赵慧高俊
Owner WUHAN TEXTILE UNIV
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