Method for synthesizing modified sodium alginate flocculating agent and application of flocculating agent
A technology of sodium alginate and flocculant, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve the problems of complicated operation and secondary pollution, and achieve good selectivity and sedimentation speed. Fast, large adsorption effect
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[0020] Example 1
[0021] Use distilled water to make 8g of sodium alginate (SA) into a 2.5% homogeneous solution, add 10ml of n-propanol and 80ml of sodium periodate solution (0.3mol / L), react at 4℃ in the dark for 24h, add 1ml of ethyl acetate The diol terminates the oxidation reaction for 15 minutes. Separate the precipitate with absolute ethanol, filter with suction and dissolve the precipitate with deionized water, precipitate with ethanol again, filter with suction, repeat this step 3 times, put the white product into a watch glass, and dry it under vacuum at 40°C for 24 hours to obtain oxidation The sodium alginate OSA.
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[0022] Example 2
[0023] In a three-necked flask, take 2.0 g of the oxidized sodium alginate in Example 1 and dissolve it in 20 mL of phosphate buffer (pH = 7.0) to make a uniform solution, and then add 50 mL of 0.5 g of thiosemicarbazide (TSC) in an aqueous solution. Stir for 4h at ℃, add 1.0g NaBH after cooling to 20℃ 4 , Complete reaction for 24h. The reaction product was precipitated out with ethanol, filtered with suction, soaked with ethanol, washed, filtered with suction, and this step was repeated 4 times, and dried under vacuum at 30° C. for 24 hours to obtain modified sodium alginate flocculant (SA-TSC1).
Example Embodiment
[0024] Example 3
[0025] Add 50 mL of an aqueous solution containing 1.0 g of thiosemicarbazide into the reactor, and the other steps are the same as in Example 2, to prepare a modified sodium alginate flocculant SA-TSC2.
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