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

Active Publication Date: 2013-10-23
ANHUI RONGJING FENGDAN BIOTECH
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AI-Extracted Technical Summary

Problems solved by technology

[0004] In recent years, the research on sodium alginate in sewage treatment generally focuses on calcium chloride cross-linking m...
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Abstract

The invention discloses a method for synthesizing a modified sodium alginate flocculating agent and an application of the flocculating agent. The method comprises the following steps of: reacting partially oxidized sodium alginate and a chelating agent thiosemicarbazide with a functional group in an aqueous solution to obtain a biodegradable natural high polymer flocculating agent. The method mainly comprises two reaction processes: (1) oxidizing the sodium alginate by using sodium periodate, and preparing the partially oxidized sodium alginate with a dialdehyde structure, wherein the oxidation degree is 68.2 percent; and (2) dissolving the oxidized sodium alginate in a phosphate buffer solution with the pH of 7.0 to prepare a uniform solution, adding the thiosemicarbazide to the uniform solution, reacting for 4 hours to generate a Schiff base, and adding NaBH4 to generate stable amine. The method is simple and easily controllable in process, low in cost and easy to popularize and apply, and raw materials are easily obtained. Nitrogen and sulfur elements are introduced into sodium alginate subjected to chemical modification, and the adsorption capacity and removal rate of the sodium alginate flocculating agent on heavy metal ions in sewage are greatly improved. The flocculating agent is biodegradable, and secondary pollutants are avoided.

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Technology Topic

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  • Method for synthesizing modified sodium alginate flocculating agent and application of flocculating agent
  • Method for synthesizing modified sodium alginate flocculating agent and application of flocculating agent
  • Method for synthesizing modified sodium alginate flocculating agent and application of flocculating agent

Examples

  • Experimental program(8)

Example Embodiment

[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.

Example Embodiment

[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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Description & Claims & Application Information

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