A kind of preparation method and application of high-efficiency adsorption modified starch microspheres
A technology of modified starch and starch microspheres, which is applied in chemical instruments and methods, adsorption water/sewage treatment, textile industry wastewater treatment, etc. It can solve the problems of single adsorption reaction active point and limited pollutant adsorption amount, and improve the reaction rate. efficiency, increasing adsorption active sites, and improving chemical stability
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Embodiment 1
[0023] (1) Add 100 g of starch to 140 ml of water, stir evenly, add 1.2 g of sodium chloride and 9.6 mL of epichlorohydrin, adjust the pH to 11.0 with NaOH solution, stir for 16 hours, and then use acetic acid to adjust the pH to 6.0, stand for precipitation, the precipitate is washed twice with water first, then washed with 70% alcohol for 4 times, and finally suction filtered, and the solid is dried in an oven at 60 °C to obtain starch microspheres.
[0024] (2) Fully mix 20 grams of urea, 2 mL of 85% phosphoric acid, and 2 grams of sodium citrate, add 7 mL of ethanol, stir until the urea and sodium citrate are completely dissolved, then add 26 grams of starch microspheres, stir evenly, and place in a 650w microwave oven Heating for 5 minutes (5 seconds for every 10 seconds of heating), the product was washed 3 times with water, then 4 times with 70% alcohol, and finally filtered with suction, and the solid was dried in an oven at 70 °C to obtain modified starch microspheres....
Embodiment 2
[0027] (1) Add 100g of starch to 150ml of water, stir evenly, add 1.5g of sodium chloride and 10mL of epichlorohydrin, adjust the pH to 12.0 with NaOH solution, stir for 15 hours, and then adjust the pH to 6.0 with acetic acid , stand for precipitation, the precipitate is first washed with water 4 times, then washed with 70% alcohol twice, and finally suction filtered, and the solid is dried in an oven at 70 °C to obtain starch microspheres.
[0028] (2) Fully mix 20 grams of urea, 3 mL of 85% phosphoric acid, and 4 grams of sodium citrate, add 8 mL of ethanol, stir until the urea and sodium citrate are completely dissolved, then add 35 grams of starch microspheres, stir evenly, and place in a 650w microwave oven Heating for 2 minutes (5 seconds for every 10 seconds of heating), the product was washed twice with water and 4 times with 70% alcohol, and finally filtered with suction, and the solid was dried in an oven at 60 °C to obtain modified starch microspheres.
[0029] (3)...
Embodiment 3
[0031] (1) Add 100 g of starch to 160 ml of water, stir evenly, add 1.8 g of sodium chloride and 13 mL of epichlorohydrin, adjust the pH to 11.0 with NaOH solution, stir for 20 hours, and then adjust the pH to 6.0 with acetic acid , stand for precipitation, the precipitate is washed three times with water, then three times with 70% alcohol, and finally suction filtered, and the solid is dried in an oven at 60 °C to obtain starch microspheres.
[0032] (2) Fully mix 25 grams of urea, 3 mL of 85% phosphoric acid, and 1 gram of sodium citrate, add 12 mL of ethanol, stir until the urea and sodium citrate are completely dissolved, then add 44 grams of starch microspheres, stir evenly, and place in a 750w microwave oven Heating for 4 minutes (5 seconds for every 10 seconds of heating), the product was washed 3 times with water, then 4 times with 70% alcohol, and finally filtered with suction, and the solid was dried in an oven at 65 °C to obtain modified starch microspheres.
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Abstract
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