Heavy metal adsorption material for edible liquid as well as preparation method and application of heavy metal adsorption material
A technology for adsorbing materials and heavy metals, which is applied in the field of heavy metal adsorption materials for edible liquids and their preparation, can solve the problems affecting the grafting density and chemical stability of β-cyclodextrin polymers, affecting the adsorption capacity of adsorbent materials for heavy metals, Limit the use value and other issues to achieve good market application prospects, ensure healthy diet, and good chemical stability.
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[0029] The preparation method of heavy metal adsorption material for edible liquid comprises the following steps:
[0030] S1. Under the condition of strong alkali and strong oxidizing property, HF is removed from polyvinylidene fluoride (PVCD) to generate functional carbon-carbon double bond structure. The specific steps are: at 30~50 ℃, put the polyvinylidene fluoride material into the mixed solution of alkaline solution and potassium permanganate solution, and stir the reaction, and the alkaline solution is selected from sodium hydroxide, potassium hydroxide, hydroxide One of calcium, potassium carbonate and sodium carbonate, the stirring speed is 200~800rmp, and the reaction time is 1~3h; after the reaction is finished, filter, wash the residual reactant on the surface with deionized water, and obtain the polyvinylidene fluoride with HF removed vinyl material.
[0031]S2. Under the action of a condensing agent, cyclodextrin (β-CD) and acrylic acid (AA) undergo esterificat...
Embodiment 1
[0038] S1. At 40°C, put 10 g of polyvinylidene fluoride material into a mixed solution of potassium hydroxide with a mass fraction of 20% and potassium permanganate with a mass fraction of 4% and stir at 500 rmp for 2 hours; filter after the reaction is completed , and the residual reactants on the surface were washed with deionized water to obtain a polyvinylidene fluoride material with HF removed.
[0039] S2. Add 3g β-cyclodextrin and 5.5g dicyclohexylcarbodiimide to 100ml dimethylformamide solution, then add 1.82ml acrylic acid, the molar ratio of β-CD, DCC and AA is 1:10 : 10, and stirred at 500 rmp at 30 ° C for 24 h; filter to remove the resulting precipitate, add 100 ml of acetone to the filtrate to precipitate the product, filter again, and wash the precipitated precipitate three times with dilute acetic acid, potassium bicarbonate solution and water in steps, The residue on the surface of the product was removed to obtain an acrylic cyclodextrin polymer, and the obta...
Embodiment 2
[0043] S1. At 35°C, put 10g of polyvinylidene fluoride material into a mixed solution of sodium hydroxide with a mass fraction of 20% and potassium permanganate with a mass fraction of 4% for 1.5h at 800 rmp; after the reaction is completed After filtering, the residual reactants on the surface were washed with deionized water to obtain a polyvinylidene fluoride material with HF removed.
[0044] S2. Add 3g β-cyclodextrin and 5g 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide to 100ml of dimethylformamide solution, then add 2ml of acrylic acid, and put in Stir at 800rmp at 35°C for 20h; filter to remove the resulting precipitate, add 100ml of acetone to the filtrate to precipitate the product, filter again, and wash the precipitated precipitate three times with dilute acetic acid, potassium bicarbonate solution and water in steps to remove residues on the surface of the product acrylic acid cyclodextrin polymer was obtained, and the obtained product was dried at 60°C for use.
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