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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 method, sodium alginate embedding method, etc., but this method is complicated to operate and easy to introduce secondary pollution

Method used

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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
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare 8g of sodium alginate (SA) with distilled water into a uniform solution with a concentration of 2.5%, add 10ml of n-propanol and 80ml of sodium periodate solution (0.3mol / L), react in the dark at 4°C for 24h, add 1ml of ethyl alcohol The diol terminated the oxidation reaction for 15 min. Use absolute ethanol to precipitate the precipitate, filter it with suction and dissolve it with deionized water, then separate it with ethanol again, filter it with suction, repeat this step 3 times, put the white product into a watch glass, and dry it in vacuum at 40°C for 24 hours to obtain the oxidized Sodium Alginate OSA.

Embodiment 2

[0023] In a three-necked flask, dissolve 2.0 g of the oxidized sodium alginate in Example 1 in 20 mL of phosphate buffer (pH=7.0) to form a uniform solution, then add 50 mL of an aqueous solution containing 0.5 g of thiosemicarbazide (TSC), 40 Stir the reaction at ℃ for 4h, add 1.0g NaBH after cooling to 20℃ 4 , complete reaction 24h. The reaction product was precipitated with ethanol, filtered with suction, soaked with ethanol, washed, and filtered with suction. This step was repeated four times, and vacuum-dried at 30°C for 24 hours to obtain modified sodium alginate flocculant (SA-TSC1).

Embodiment 3

[0025] 50 mL of an aqueous solution containing 1.0 g of thiosemicarbazide was added to the reactor, and the other steps were the same as in Example 2 to prepare the modified sodium alginate flocculant SA-TSC2.

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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.

Description

technical field [0001] The invention relates to a synthesis method of a modified sodium alginate flocculant and an environment-friendly material for treating heavy metal ions in sewage, belonging to the technical field of natural polymer flocculants. Background technique [0002] Heavy metal ions in water mainly come from the wastewater discharge of electroplating, metallurgy, mining and other industrial production, mainly including lead (Pb), cadmium (Cd), mercury (Hg), chromium (Cr), copper (Cu), zinc (Zn ), nickel (Ni), etc. Heavy metal elements are highly toxic, do not decompose, and have risks such as carcinogenic, teratogenic, and mutagenic. Heavy metal ions do not decompose in nature, and many heavy metals have high economic value, so the treatment and recovery of heavy metal wastewater is very important. Heavy metal pollution has become a worldwide environmental problem and has attracted more and more attention. [0003] Traditional methods for removing heavy meta...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F1/62C02F101/20
Inventor 倪才华孟朵
Owner ANHUI RONGJING FENGDAN BIOTECH
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