Method for preparing schiff base-modified ionic framework material and use thereof in advanced purification of 177 lu-containing medical wastewater

A method for advanced purification of 177Lu-containing medical wastewater using a Schiff base-modified ionic framework material, comprising:

• packing the Schiff base-modified ionic framework material into a single-stage or multi-stage glass chromatographic column via wet filling, wherein a mass ratio of the 177Lu-containing medical wastewater to the Schiff base-modified ionic framework material ranges from 10:1 to 1000:1;
• and performing adsorption in series and/or parallel configuration, wherein the 177Lu-containing medical wastewater is introduced into the glass chromatographic column in a bottom-in/top-out manner at a flow rate of 0.01-100 L/h controlled by adjusting a peristaltic pump;
• wherein a method for preparing the Schiff base-modified ionic framework material comprises:
• S1:
• cutting a sponge substrate into cuboids with a length of 5-20 mm and a width and thickness of 5-10 mm;
• immersing the sponge substrate in absolute ethanol, performing oscillation in an ultrasonic oscillator for 20-30 min, and repeating 2-3 times to remove impurities;
• and drying for later use;
• S2:
• adding an amine compound and an aldehyde compound to an organic solvent for reaction at room temperature:
• adding ethyl acetate and dichloromethane for reaction to proceed statically at room temperature for 10-30 min to obtain a precursor solution;
• and
• adding an amino acid-based metal ionic liquid to the precursor solution, performing oscillation using an oscillator, and allowing a resulting mixture to stand at room temperature for 5-10 min to obtain a functionalized reagent, wherein the organic solvent comprises any one of acetone, acetonitrile, ethanol, and dimethyl sulfoxide, or a combination thereof:
• the amine compound is tris(2-aminoethyl)amine;
• the aldehyde compound is terephthalaldehyde;
• and the amino acid-based metal ionic liquid is a lysine-based metal ionic liquid and contains a metal ion being any one of sodium, potassium, magnesium, calcium, aluminum, and iron, or a combination thereof;
• and
• S3:
• immersing the sponge substrate in the functionalized reagent;
• allowing for reaction to proceed statically at 20-30° C. for 5-20 min while shaking every 2-5 min during the reaction;
• and drying to obtain the Schiff base-modified ionic framework material, wherein a dosage ratio of the sponge substrate to the functionalized reagent ranges from (0.015 g):(10 mL) to (0.03 g):(10 mL);
• wherein a structural formula of the Schiff base-modified ionic framework material is as follows:
• wherein M represents one or a combination of metal cations comprising sodium, potassium, magnesium, calcium, aluminum, and iron;
• and n represents an integer from 1 to 3.