Magnetic modified sodium alginate flocculating agent

A technology of sodium alginate and flocculant, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of inability to completely separate metals, low mechanical strength, poor sample selection, etc., and achieve fast and clean separation effect, good adsorption and flocculation effect, good adsorption effect

Active Publication Date: 2014-05-28
JINING XINRUIDA INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Methods for separating and enriching precious metals from solutions include activated carbon, industrial waste or natural material adsorption, solvent extraction, ion exchange, and adsorption resins. Traditional exchange resins usually have poor sample selection, low mechanical strength, or high prices, and cannot completely separate metals. It is easy to cause secondary pollution to the environment and is limited in application

Method used

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  • Magnetic modified sodium alginate flocculating agent
  • Magnetic modified sodium alginate flocculating agent
  • Magnetic modified sodium alginate flocculating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] FeCl 3 ·6H 2 O was dissolved in distilled water to prepare a 0.5 mol / L ferric chloride solution. Take 44mL of ferric chloride solution (0.5molL -1 ) in a 250mL three-necked flask, add 3.5g of FeCl 2 4H 2 O is completely dissolved, blow nitrogen for 30min, and slowly add 110mL of NaOH solution (1.0mol L -1 ), stirred vigorously at 60°C for 1h, then raised the temperature to 80°C and matured for 1h, washed twice with water and ethanol respectively to obtain Fe 3 o 4 magnetic nanoparticles.

Embodiment 2

[0027] Prepare the aqueous solution of 100ml ethanol (volume ratio 1: 1) as dispersion medium, transfer in the 250mL three-neck flask, the Fe of 2g 3 o 4 Disperse the nanoparticles in the aqueous solution of ethanol, add a small amount of glacial acetic acid dropwise to adjust the pH value to be acidic, pass nitrogen gas for 30 minutes, slowly add 12mL of KH-550 with a separatory funnel, keep the system closed, stir vigorously at 40°C for 4 hours, and the reaction is complete Finally, the nanoparticles were separated by a magnet, washed twice with absolute ethanol, and dried under vacuum at 40 °C to obtain amino-modified Fe 3 o 4 Nanoparticles (Fe-NH 2 ).

Embodiment 3

[0029] Under the condition of 4℃~8℃ protected from light, SA was oxidized by sodium periodate to prepare partially oxidized sodium alginate OSA with a yield of 87%. Dissolve 8g of OSA in 80mL of phosphate buffer (pH=7), add 100mL of a certain concentration of TSC aqueous solution, stir and react at 40°C for 4h, cool to 20°C and add appropriate amount of NaBH in batches 4 , complete reaction 24h. The product was precipitated with ethanol, filtered with suction, soaked with ethanol again, and filtered with suction, and this process was repeated four times, and dried in vacuum at 30°C for 24 hours to obtain light yellow powder flocculant thiosemicarbazide-sodium alginate ST.

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Abstract

The invention discloses a preparation method and application of a magnetic modified sodium alginate flocculating agent. The preparation method comprises the following steps: grafting partially oxidized sodium alginate by using thiosemicarbazide, and performing reaction with Fe3O4 nanoparticles of which the surfaces are modified by amino groups to obtain a magnetic thiosemicarbazide-sodium alginate flocculating agent with a special effect. The method mainly comprises the following three reaction processes of (1) reacting the partially oxidized sodium alginate with the thiosemicarbazide to generate a Schiff base, and reacting the Schiff base with NaBH4 to generate stable amine; (2) preparing the magnetic Fe3O4 nanoparticles by using a co-precipitation method, and performing surface modification on the Fe3O4 nanoparticles by using gamma-aminopropyltriethoxysilane (KH-550); (3) reacting thiosemicarbazide-sodium alginate with the modified Fe3O4 nanoparticles to obtain the magnetic sodium alginate flocculating agent (ST-Fe) at room temperature in the presence of a catalyst EDC / NHS. The obtained product can be applied to sewage treatment and precious metal recovery, has the advantages of efficient adsorption, high sedimentation speed, simplicity in separation, low cost, biodegradability, no secondary pollution and the like, and has wide industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of a magnetically modified sodium alginate flocculant and its use in the recovery of noble metal ions in waste water, belonging to the technical field of polymer flocculants. Background technique [0002] With the development of industry and the wide application of precious metals, the demand for them is increasing day by day. However, due to the reduction of mineral resources, the recovery of precious metals has become particularly important. Wastewater from metallurgy and electroplating contains difficult-to-treat and recover precious metal ions such as gold and silver. It is of great practical value to find suitable adsorbents to recover gold and silver ions. [0003] Methods for separating and enriching precious metals from solutions include activated carbon, industrial waste or natural material adsorption, solvent extraction, ion exchange, and adsorption resins. Traditional exchange resins usually have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 倪才华孟朵
Owner JINING XINRUIDA INFORMATION TECH CO LTD
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