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
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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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