Preparation method of fluorine removal adsorbent modified by biopolymer composite material

A technology of biopolymers and composite materials, which is applied to the materials of anion exchangers, chemical instruments and methods, and water pollutants, and can solve problems such as high operating costs, metal ion leakage, and poor cycle stability.

Active Publication Date: 2021-07-06
JIANGSU HELPER FUNCTIONAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently a simple and cost-effective treatment technique: ion-exchange technology, the mechanism behind the adsorption of fluorine on these adsorbents usually relies on well-structured interactions occurring between the adsorbent and the fluoride, as well as hydrogen bonding and Other types of interactions involving fluoride ions, currently, for the leakage of adsorbent-loaded metal ions, as well as high operating costs and poor cycle stability are common disadvantages of adsorbents on the market

Method used

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  • Preparation method of fluorine removal adsorbent modified by biopolymer composite material
  • Preparation method of fluorine removal adsorbent modified by biopolymer composite material
  • Preparation method of fluorine removal adsorbent modified by biopolymer composite material

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preparation example Construction

[0030] A preparation method of a fluorine-removing adsorbent modified by a biopolymer composite material, comprising the steps of:

[0031] Step 1: Dissolve 1-10 g chitosan in 100-200ml deionized water or 2%-10% acid, and stir for 1-6 hours under magnetic stirring;

[0032] Step 2: Dissolve 1-10 g pectin in 100-200ml deionized water or 2%-10% acid, and stir for 2-6 hours under magnetic stirring;

[0033] Step 3: Mix the two solutions obtained in the above steps 1 and 2, and stir at 40-80°C for 1-3 hours;

[0034] Step 4: Soak 2-10g of molecular sieves in deionized water for 1-3 hours, add to the mixed solution in step 3, and distill under reduced pressure at 60-100°C for 3-8 hours;

[0035] Step 5: Suction filter the excess mixed solution, wash with deionized water 3 times; add 1-5g chloroacetic acid, 20-200 ml 2%-10% sodium hydroxide aqueous solution, and stir at room temperature for 2-3h;

[0036] Step 6: Dissolving 1-5 mol of metal nitrate in a mixed solution of ethanol a...

Embodiment 1

[0043] Step 1: Dissolve 1 g of chitosan in 100 ml of deionized water, and stir for 2 hours under magnetic stirring;

[0044] Step 2: Dissolve 1 g of pectin in 100 ml of 2% acetic acid, and stir for 2 hours under magnetic stirring;

[0045]Step 3: Mix the two solutions of Step 1 and Step 2, and stir at 80°C for 3 hours;

[0046] Step 4: After soaking 2g molecular sieve (100 mesh) in deionized water for 1 hour, add it to the mixed solution in step 3, and distill under reduced pressure at 60°C for 3 hours;

[0047] Step 5: Suction filter the excess mixed solution, wash with deionized water 3 times; add 1 g of chloroacetic acid, 50 ml of 2% sodium hydroxide aqueous solution, and stir at room temperature for 3 h;

[0048] Step 6: Add 1mol metal nitrate: Fe(NO 3 ) 3 Dissolve in a mixed solution of ethanol and water with a volume ratio of 1:1, and stir at room temperature for 10 minutes;

[0049] Step 7: Add the solution filtered through molecular sieves in step 5 to the nitrate ...

Embodiment 2

[0052] Step 1: Dissolve 1 g of chitosan in 100 ml of 2% acetic acid, and stir for 1 hour under magnetic stirring;

[0053] Step 2: 2 g pectin was dissolved in 150ml 3% acetic acid, and stirred for 2 hours under magnetic stirring;

[0054] Step 3: Mix the two solutions of Step 1 and Step 2, and stir at 50°C for 3 hours;

[0055] Step 4: Soak 6 g molecular sieves (200 mesh) in deionized water for 1 hour, add to the mixed solution in step 3, and distill under reduced pressure at 60°C for 2 h;

[0056] Step 5: Suction filter the excess mixed solution, wash with deionized water 3 times; add 2 g of chloroacetic acid, 100 ml of 2% sodium hydroxide aqueous solution, and stir at room temperature for 2 h;

[0057] Step 6: 2mol metal nitrate: Fe(NO 3 ) 3 Dissolve in a mixed solution of ethanol and water with a volume ratio of 1:1, and stir at room temperature for 10 minutes;

[0058] Step 7: Add the solution filtered through molecular sieves in step 5 to the nitrate solution in step ...

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Abstract

A preparation method of a fluorine removal adsorbent modified by a biopolymer composite material comprises the following steps: respectively dissolving chitosan and pectin in deionized water or acid, mixing and heating the two solutions, and carrying out a biopolymer cross-linking reaction; adding a molecular sieve soaked in deionized water into the mixed solution, performing reduced pressure distillation, adding chloroacetic acid and a sodium hydroxide aqueous solution, and grafting the chloroacetic acid to modify the chitosan-pectin biopolymer composite material; adding metal nitrate dissolved in a mixed solution of ethanol and water into the modified molecular sieve, performing reduced pressure distillation, adding a sodium hydroxide solution, stirring at room temperature, and doping metal ions into crystal lattices of the modified polymer; and filtering redundant mixed solution, washing to be neutral with de-daubing water, and drying in a drying oven to obtain the modified defluorination adsorbent. The method is simple in preparation process, low in cost, easy to recycle and high in defluorination efficiency in wastewater.

Description

technical field [0001] The invention relates to the technical field of preparing fluorine-removing adsorbents, in particular to a fluoride-removing adsorbent modified by biopolymer composite materials. Background technique [0002] Phosphate fertilizer production, aluminum smelting and electroplating industries will produce fluorine-containing waste gas, waste water, and waste residue in actual production operations, and discharge them into the natural environment. way to reach groundwater. Fluorine is the most electronegative element and therefore has a negative charge in aqueous media and forms F - ion. While trace amounts of fluorine are essential to the human body, high concentrations can lead to serious problems such as Alzheimer's disease, infertility, osteoporosis, thyroid disease, brain damage, cancer, brittle bones, etc. In view of the seriousness of the hazards of excessive fluorine and the fact that most of the fluorine content in the global groundwater excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30B01J41/08C02F1/42C02F101/14C02F101/36
CPCB01J20/24B01J20/16B01J20/28004B01J41/08C02F1/42C02F2001/422C02F2101/14C02F2101/36
Inventor 蔡建国石洪雁刘锐
Owner JIANGSU HELPER FUNCTIONAL MATERIALS
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