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The application relates to a COF adsorbent for efficiently and selectively recovering Pb (II) and application thereof, and belongs to the field of high-efficiency adsorbents for adsorbing heavy metals and high-sensitivity electrochemical sensors. A Schiff base reaction occurs between benzene [1,2-b:3,4-b':5,6-b'] trithiophene-2,5,8-trialdehyde (BTT) and 3,3'-dihydroxybenzidine (DHBD) to obtain BTT-DHBD-COF, which has excellent adsorption performance on Pd (II), and the adsorption capacity can reach 570.7 mg / g after 10 min of adsorption; the detection limit of BTT-DHBD-COF / GCE on Pb (II) is 3*10 ‑12 mol L ‑1 .

The present invention relates to a method for preparing liquid printed matter based on polysaccharide and amino polydimethylsiloxane, and the method comprises: step 1, preparing a polysaccharide solution with deionized water as solvent, stirring at room temperature for 2 hours, and then putting it in a refrigerator for 8-12 hours; step 2, dissolving an additive in the polysaccharide solution to prepare an additive-polysaccharide working solution; step 3, preparing an NH2-PDMS-NH2 solution with soybean oil as solvent and stirring for 2 hours to fully dissolve, thereby obtaining an NH2-PDMS-NH2 solution; step 4, placing the additive-polysaccharide working solution in a syringe, immersing it in the NH2-PDMS-NH2 solution, and injecting the additive-polysaccharide working solution in the syringe at a fixed speed to obtain a spherical structure liquid printed matter loaded with additives or a continuous filamentous structure liquid printed matter. The present invention uses NH2-PDMS-NH2 as a fat-soluble nucleophilic reagent to easily capture H + Anionic polysaccharides carry a positive charge while negatively charged in aqueous solution, which enables encapsulation and shaping of the liquid, increases the stability of the system, and serves as a delivery vehicle for water-soluble nutritional factors.

Embodiments of the present application disclose information screening interaction method and device and electronic equipment. The method comprises: displaying a target page, the target page comprising a first area and a second area, the first area being configured to display information of a plurality of data objects, the second area being configured to provide a sliding bar element and a sliding control element movable along the sliding bar element; the sliding bar element comprising a plurality of sliding areas, the plurality of sliding areas corresponding to a plurality of selectable screening condition values when screening the plurality of data objects in a target dimension; in response to an operation of dragging the sliding control element, determining a selected target screening condition value according to a sliding area where the sliding control element is dragged to; and updating the first area after screening the plurality of data objects according to the target screening condition value. Through the embodiments of the present application, the interaction efficiency of the information screening process can be improved.