Heavy metal ion imprinted hydrogel beads as well as preparation method and application thereof
A technology of heavy metal ions and ion imprinting, applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of limited application range, complicated process, high production cost, etc., and achieve good adsorption effect , simple preparation process and low production cost
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Embodiment 1
[0034] A preparation method of heavy metal ion imprinted hydrogel beads, comprising the steps of:
[0035] (a) Sodium alginate, ethylenediaminetetraacetic acid and carboxymethyl cellulose are added to pure water, stirred and mixed evenly, then a crosslinking agent is added, sealed, stirred and reacted to obtain a sol;
[0036] (b) Drop the above-mentioned sol into the heavy metal ion solution at a constant speed to form hydrogel beads while performing ion imprinting and solidification; then wash the hydrogel beads with pure water, and then elute the ions in the beads with an acidic eluent. Template heavy metal ions, then wash with pure water, repeat elution and washing several times, and obtain heavy metal ion imprinted hydrogel beads.
Embodiment 2
[0038] A preparation method of heavy metal ion imprinted hydrogel beads, comprising the steps of:
[0039] (a) Weigh sodium alginate, ethylenediaminetetraacetic acid, and carboxymethyl cellulose and add them into pure water at a mass ratio of 1 to 3:1:1, then add pure water to make up the volume, and control the sodium alginate, ethyl The concentrations of diaminetetraacetic acid and carboxymethyl cellulose are both 0.5-2.0wt%, and then placed on a constant temperature magnetic stirrer at a constant temperature of 20-45°C, stirring at a constant speed for 3-10 hours, so that they are fully dissolved and mixed uniformly; Then add the cross-linking agent glutaraldehyde, control the concentration of the cross-linking agent in the reaction solution to 0.001-0.01wt%, seal it, and under the condition of the cross-linking temperature of 20-55 ° C, magnetically stir the reaction for 5-15 hours to prepare the sol ;
[0040] (c) Using a micro-injection pump, drop the prepared sol solut...
Embodiment 3
[0042] A preparation method of heavy metal ion imprinted hydrogel beads, comprising the steps of:
[0043] (a) Weigh 3.0g each of sodium alginate, ethylenediaminetetraacetic acid and carboxymethyl cellulose, add them to pure water in turn, set the volume to 200mL, place on a constant temperature magnetic stirrer, stir at a constant speed for 6h, dissolve and mix Evenly, add 4mL of 25% glutaraldehyde solution, seal, and stir at 25°C for 12h;
[0044] (b) Using a micro-syringe pump, drop the prepared sol into 200 mL of Cu with a concentration of 0.2 mol / L at a constant speed 2+ In the solution, the ion imprint was solidified for 10 hours to form hydrogel beads; after that, the hydrogel beads were washed 5 times with pure water (50 mL of pure water each time), and 100 mL of HCl solution with a concentration of 0.5 mol / L was used to elute the water Cu in gel beads 2+ , washed with 200mL pure water, repeated elution and washing 5 times, and the heavy metal ion imprinted hydrogel ...
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