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Modified polyacrylonitrile for treating wastewater containing antimony and preparation method thereof

A polyacrylonitrile, polyacrylonitrile-based technology, applied in the field of modified polyacrylonitrile and its preparation, can solve the problems of limited oxime-based conversion rate, etc., and achieve the effects of good effect, abundant raw material sources and strong adsorption capacity

Inactive Publication Date: 2019-02-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the oxime reaction of PAN chelate fiber, the reaction time is generally not more than 3 hours, and the oxime conversion rate is limited.

Method used

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  • Modified polyacrylonitrile for treating wastewater containing antimony and preparation method thereof
  • Modified polyacrylonitrile for treating wastewater containing antimony and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh about 0.1g of PAN powder, immerse it in 100mL of 15g / L hydroxylamine hydrochloride aqueous solution, and add 1.10g of anhydrous sodium carbonate (the molar ratio of sodium carbonate and hydroxylamine hydrochloride is about 1:2), gently Stir to dissolve the sodium carbonate, and perform in-situ amidoximation in a water bath at 80°C.

[0034] (2) The reaction time is 4 hours, the product is taken out, soaked and washed with deionized water to remove sodium salt and unreacted hydroxylamine.

[0035] (3) The washed product was dried in an oven at 50° C. for 2 hours, dried in vacuum at 70° C. for 24 hours, and then taken out.

[0036] (4) The obtained product is ground into a granular adsorbent with a mesh number of 100 mesh.

[0037] During the adsorption experiment, prepare 200 mL of antimony-containing simulated wastewater with initial concentrations of 10, 30, 50, 70, and 90 mg / L, respectively, and place them in 5 Erlenmeyer flasks, and then add 0.1 g of granu...

Embodiment 2

[0039] (1) Weigh about 0.1g of PAN powder, immerse it in 100mL of 15g / L hydroxylamine hydrochloride aqueous solution, and add 1.10g of anhydrous sodium carbonate (the molar ratio of sodium carbonate and hydroxylamine hydrochloride is about 1:2), gently Stir to dissolve the sodium carbonate, and perform in-situ amidoximation in a water bath at 80°C.

[0040] (2) The reaction time is 8 hours, the product is taken out, soaked and washed with deionized water to remove sodium salt and unreacted hydroxylamine.

[0041] (3) The washed product was dried in an oven at 50° C. for 2 hours, dried in vacuum at 70° C. for 24 hours, and then taken out.

[0042] (4) The obtained product is ground into a granular adsorbent with a mesh number of 100 mesh.

[0043] During the adsorption experiment, prepare 200 mL of antimony-containing simulated wastewater with initial concentrations of 10, 30, 50, 70, and 90 mg / L, respectively, and place them in 5 Erlenmeyer flasks, and then add 0.1 g of granu...

Embodiment 3

[0045] (1) Weigh about 0.1g of PAN powder, immerse it in 100mL of 15g / L hydroxylamine hydrochloride aqueous solution, and add 1.10g of anhydrous sodium carbonate (the molar ratio of sodium carbonate and hydroxylamine hydrochloride is about 1:2), gently Stir to dissolve the sodium carbonate, and perform in-situ amidoximation in a water bath at 60°C.

[0046] (2) The reaction time is 4 hours, the product is taken out, soaked and washed with deionized water to remove sodium salt and unreacted hydroxylamine.

[0047] (3) The washed product was dried in an oven at 50° C. for 2 hours, dried in vacuum at 70° C. for 24 hours, and then taken out.

[0048] (4) The obtained product is ground into a granular adsorbent with a mesh number of 100 mesh.

[0049]During the adsorption experiment, prepare 200 mL of antimony-containing simulated wastewater with initial concentrations of 10, 30, 50, 70, and 90 mg / L, respectively, and place them in 5 Erlenmeyer flasks, and then add 0.1 g of granul...

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Abstract

The invention discloses modified polyacrylonitrile for treating wastewater containing antimony and a preparation method thereof and relates to the field of adsorbents. The preparation method includesthe following steps: S1) immersing a polyacrylonitrile substrate in an aqueous solution of hydroxylamine hydrochloride, adding anhydrous sodium carbonate and stirring; S2) after the anhydrous sodium carbonate is completely dissolved, heating a mixed solution in the step S1) in a water bath to start reaction and conducting amidoximation on the polyacrylonitrile substrate in situ; conducting the reaction in the step S2) for 4-12 hours, taking a product out, immersing and washing the product with deionized water, drying the washed product in an oven and vacuum-dehydrating the dried product; S4) grinding the product obtained in the step S3). A modified polyacrylonitrile particle adsorbent prepared has the following advantage that raw materials can be derived from discarded PAN fiber filamentsand rags; the preparation method is simple and the process is mild; the adsorption capacity to the antimony is high and the maximum adsorption amount is large; the desorption effect is good, and the modified polyacrylonitrile can be recycled for many times.

Description

technical field [0001] The invention relates to the field of adsorbents, in particular to a modified polyacrylonitrile for treating antimony-containing wastewater and a preparation method thereof. Background technique [0002] Antimony metal and its compounds are widely used in flame retardants, alloys, ceramics, pigments and synthetic fibers. With the increase of antimony consumption, antimony pollution has attracted more and more attention in recent years. In the natural environment, antimony mainly exists in the form of trivalent Sb(III) and pentavalent Sb(V). Sb(III) can be adsorbed and oxidized to Sb(V) by oxidants in natural water bodies or their sediments, so in the oxidized state, Sb in water is mainly Sb(OH) 6 - (ie Sb(V)) form exists. Antimony entering into the water environment has high cumulative toxicity and carcinogenicity to the human body. The toxicity of antimony in different valence states is: Sb(0)>Sb(III)>Sb(V), and the toxicity of Sb(III) is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28C02F1/28C02F101/20
CPCB01J20/261B01J20/28016C02F1/285C02F2101/20
Inventor 邵嘉慧涂永辉林源欣任龙飞
Owner SHANGHAI JIAO TONG UNIV
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